projects/dwt2: org.eclipse.jface.text/src/org/eclipse/jface/internal/text/revisions/Colors.d annotate

annotate org.eclipse.jface.text/src/org/eclipse/jface/internal/text/revisions/Colors.d @ 12:bc29606a740c

Added dwt-addons in original directory structure of eclipse.org

author	Frank Benoit <benoit@tionex.de>
date	Sat, 14 Mar 2009 18:23:29 +0100
parents
children

rev	line source
12 bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	1 /*******************************************************************************
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	2 * Copyright (c) 2006, 2007 IBM Corporation and others.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	3 * All rights reserved. This program and the accompanying materials
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	4 * are made available under the terms of the Eclipse Public License v1.0
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	5 * which accompanies this distribution, and is available at
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	6 * http://www.eclipse.org/legal/epl-v10.html
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	7 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	8 * Contributors:
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	9 * IBM Corporation - initial API and implementation
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	10 * Port to the D programming language:
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	11 * Frank Benoit <benoit@tionex.de>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	12 *******************************************************************************/
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	13 module org.eclipse.jface.internal.text.revisions.Colors;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	14
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	15 import org.eclipse.jface.internal.text.revisions.HunkComputer; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	16 import org.eclipse.jface.internal.text.revisions.LineIndexOutOfBoundsException; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	17 import org.eclipse.jface.internal.text.revisions.Hunk; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	18 import org.eclipse.jface.internal.text.revisions.ChangeRegion; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	19 import org.eclipse.jface.internal.text.revisions.Range; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	20 import org.eclipse.jface.internal.text.revisions.RevisionPainter; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	21 import org.eclipse.jface.internal.text.revisions.RevisionSelectionProvider; // packageimport
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	22
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	23
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	24 import java.lang.all;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	25 import java.util.Set;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	26
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	27
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	28 import org.eclipse.swt.SWT;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	29 import org.eclipse.swt.graphics.RGB;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	30 import org.eclipse.core.runtime.Assert;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	31
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	32 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	33 * Utility for color operations.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	34 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	35 * @since 3.3
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	36 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	37 public final class Colors {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	38 /*
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	39 * Implementation note: Color computation assumes sRGB, which is probably not true, and does not
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	40 * always give good results. CIE based algorithms would be better, see
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	41 * http://www.w3.org/TR/PNG-ColorAppendix.html and http://en.wikipedia.org/wiki/Lab_color_space
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	42 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	43
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	44 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	45 * Returns the human-perceived brightness of a color as float in [0.0, 1.0]. The used RGB
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	46 * weights come from http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC9.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	47 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	48 * @param rgb the color
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	49 * @return the gray-scale value
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	50 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	51 public static float brightness(RGB rgb) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	52 return Math.min(1f, (0.2126f * rgb.red + 0.7152f * rgb.green + 0.0722f * rgb.blue + 0.5f) / 255f);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	53 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	54
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	55 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	56 * Normalizes a color in its perceived brightness. Yellows are darkened, while blues and reds
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	57 * are lightened. Depending on the hue, the brightness range within the RGB gamut may be
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	58 * different, outside values are clipped. Note that this is an approximation; the returned RGB
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	59 * is not guaranteed to have the requested {@link #brightness(RGB) brightness}.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	60 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	61 * @param color the color to normalize
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	62 * @param brightness the requested brightness, in [0, 1]
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	63 * @return a normalized version of <code>color</code>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	64 * @see #brightness(RGB)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	65 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	66 public static RGB adjustBrightness(RGB color, float brightness_) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	67 float[] hsi= toHSI(color);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	68 float psychoFactor= brightness_ - brightness(color);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	69 float weight= 0.5f; // found by trial and error
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	70 hsi[2]= Math.max(0, Math.min(1.0f, hsi[2] + psychoFactor * weight));
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	71 color= fromHSI(hsi);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	72 return color;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	73 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	74
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	75 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	76 * Converts an {@link RGB} to an <a href="http://en.wikipedia.org/wiki/HSL_color_space">HSI</a>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	77 * triplet.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	78 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	79 * @param color the color to convert
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	80 * @return the HSI float array of length 3
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	81 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	82 private static float[] toHSI(RGB color) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	83 float r = color.red / 255f;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	84 float g = color.green / 255f;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	85 float b = color.blue / 255f;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	86 float max = Math.max(Math.max(r, g), b);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	87 float min = Math.min(Math.min(r, g), b);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	88 float delta = max - min;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	89 float maxPlusMin= max + min;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	90 float intensity = maxPlusMin / 2;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	91 float saturation= intensity < 0.5 ? delta / maxPlusMin : delta / (2 - maxPlusMin);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	92
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	93 float hue = 0;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	94 if (delta !is 0) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	95 if (r is max) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	96 hue = (g - b) / delta;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	97 } else {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	98 if (g is max) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	99 hue = 2 + (b - r) / delta;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	100 } else {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	101 hue = 4 + (r - g) / delta;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	102 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	103 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	104 hue *= 60;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	105 if (hue < 0) hue += 360;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	106 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	107 return [hue, saturation, intensity];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	108 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	109
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	110 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	111 * Converts a <a href="http://en.wikipedia.org/wiki/HSL_color_space">HSI</a> triplet to an RGB.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	112 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	113 * @param hsi the HSI values
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	114 * @return the RGB corresponding to the HSI spec
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	115 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	116 private static RGB fromHSI(float[] hsi) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	117 float r, g, b;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	118 float hue= hsi[0];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	119 float saturation= hsi[1];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	120 float intensity= hsi[2];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	121 if (saturation is 0) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	122 r = g = b = intensity;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	123 } else {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	124 float temp2= intensity < 0.5f ? intensity * (1.0f + saturation) : (intensity + saturation) - (intensity * saturation);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	125 float temp1= 2f * intensity - temp2;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	126 if (hue is 360) hue = 0;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	127 hue /= 360;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	128
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	129 r= hue2RGB(temp1, temp2, hue + 1f/3f);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	130 g= hue2RGB(temp1, temp2, hue);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	131 b= hue2RGB(temp1, temp2, hue - 1f/3f);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	132 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	133
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	134 int red = cast(int)(r * 255 + 0.5);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	135 int green = cast(int)(g * 255 + 0.5);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	136 int blue = cast(int)(b * 255 + 0.5);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	137 return new RGB(red, green, blue);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	138 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	139
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	140 private static float hue2RGB(float t1, float t2, float hue) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	141 if (hue < 0)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	142 hue += 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	143 else if (hue > 1)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	144 hue -= 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	145 if (6f * hue < 1)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	146 return t1 +(t2 - t1) * 6f * hue;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	147 if (2f * hue < 1)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	148 return t2;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	149 if (3f * hue < 2)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	150 return t1 + (t2 - t1) * (2f/3f - hue) * 6f;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	151 return t1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	152 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	153
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	154 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	155 * Returns an RGB that lies between the given foreground and background
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	156 * colors using the given mixing factor. A <code>factor</code> of 1.0 will produce a
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	157 * color equal to <code>fg</code>, while a <code>factor</code> of 0.0 will produce one
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	158 * equal to <code>bg</code>.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	159 * @param bg the background color
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	160 * @param fg the foreground color
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	161 * @param factor the mixing factor, must be in [0, 1]
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	162 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	163 * @return the interpolated color
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	164 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	165 public static RGB blend(RGB bg, RGB fg, float factor) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	166 Assert.isLegal(bg !is null);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	167 Assert.isLegal(fg !is null);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	168 Assert.isLegal(factor >= 0f && factor <= 1f);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	169
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	170 float complement= 1f - factor;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	171 return new RGB(
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	172 cast(int) (complement * bg.red + factor * fg.red),
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	173 cast(int) (complement * bg.green + factor * fg.green),
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	174 cast(int) (complement * bg.blue + factor * fg.blue)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	175 );
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	176 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	177
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	178 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	179 * Returns an array of colors in a smooth palette from <code>start</code> to <code>end</code>.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	180 * <p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	181 * The returned array has size <code>steps</code>, and the color at index 0 is <code>start</code>, the color
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	182 * at index <code>steps - 1</code> is <code>end</code>.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	183 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	184 * @param start the start color of the palette
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	185 * @param end the end color of the palette
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	186 * @param steps the requested size, must be > 0
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	187 * @return an array of <code>steps</code> colors in the palette from <code>start</code> to <code>end</code>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	188 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	189 public static RGB[] palette(RGB start, RGB end, int steps) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	190 Assert.isLegal(start !is null);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	191 Assert.isLegal(end !is null);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	192 Assert.isLegal(steps > 0);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	193
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	194 if (steps is 1)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	195 return [ start ];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	196
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	197 float step= 1.0f / (steps - 1);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	198 RGB[] gradient= new RGB[steps];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	199 for (int i= 0; i < steps; i++)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	200 gradient[i]= blend(start, end, step * i);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	201
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	202 return gradient;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	203 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	204
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	205 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	206 * Returns an array of colors with hues evenly distributed on the hue wheel defined by the <a
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	207 * href="http://en.wikipedia.org/wiki/HSV_color_space">HSB color space</a>. The returned array
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	208 * has size <code>steps</code>. The distance <var>d</var> between two successive colors is
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	209 * in [120°, 180°].
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	210 * <p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	211 * The color at a given <code>index</code> has the hue returned by
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	212 * {@linkplain #computeHue(int) computeHue(index)}; i.e. the computed hues are not equidistant,
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	213 * but adaptively distributed on the color wheel.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	214 * </p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	215 * <p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	216 * The first six colors returned correspond to the following {@link SWT} color constants:
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	217 * {@link SWT#COLOR_RED red}, {@link SWT#COLOR_GREEN green}, {@link SWT#COLOR_BLUE blue},
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	218 * {@link SWT#COLOR_YELLOW yellow}, {@link SWT#COLOR_CYAN cyan},
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	219 * {@link SWT#COLOR_MAGENTA magenta}.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	220 * </p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	221 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	222 * @param steps the requested size, must be >= 2
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	223 * @return an array of <code>steps</code> colors evenly distributed on the color wheel
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	224 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	225 public static RGB[] rainbow(int steps) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	226 Assert.isLegal(steps >= 2);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	227
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	228 RGB[] rainbow= new RGB[steps];
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	229 for (int i= 0; i < steps; i++)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	230 rainbow[i]= new RGB(computeHue(i), 1f, 1f);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	231
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	232 return rainbow;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	233 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	234
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	235 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	236 * Returns an indexed hue in [0°, 360°), distributing the hues evenly on the hue wheel
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	237 * defined by the <a href="http://en.wikipedia.org/wiki/HSV_color_space">HSB (or HSV) color
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	238 * space</a>. The distance <var>d</var> between two successive colors is in [120°, 180°].
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	239 * <p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	240 * The first six colors returned correspond to the following {@link SWT} color constants:
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	241 * {@link SWT#COLOR_RED red}, {@link SWT#COLOR_GREEN green}, {@link SWT#COLOR_BLUE blue},
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	242 * {@link SWT#COLOR_YELLOW yellow}, {@link SWT#COLOR_CYAN cyan},
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	243 * {@link SWT#COLOR_MAGENTA magenta}.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	244 * </p>
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	245 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	246 * @param index the index of the color, must be >= 0
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	247 * @return a color hue in [0°, 360°)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	248 * @see RGB#RGB(float, float, float)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	249 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	250 public static float computeHue(int index) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	251 Assert.isLegal(index >= 0);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	252 /*
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	253 * Base 3 gives a nice partitioning for RGB colors with red, green, blue being the colors
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	254 * 0,1,2, and yellow, cyan, magenta colors 3,4,5.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	255 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	256 final int base= 3;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	257 final float range= 360f;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	258
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	259 // partition the baseRange by using the least significant bit to select one half of the
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	260 // partitioning
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	261 int baseIndex= index / base;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	262 float baseRange= range / base;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	263 float baseOffset= 0f;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	264 while (baseIndex > 0) {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	265 baseRange /= 2;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	266 int lsb= baseIndex % 2;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	267 baseOffset += lsb * baseRange;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	268 baseIndex >>= 1;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	269 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	270
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	271 final int baseMod= index % base;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	272 final float hue= baseOffset + baseMod * range / base;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	273 Assert.isTrue(hue >= 0 && hue < 360);
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	274 return hue;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	275 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	276
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	277 private this() {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	278 // not instantiatable
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	279 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	280
bc29606a740c Added dwt-addons in original directory structure of eclipse.org Frank Benoit <benoit@tionex.de> parents: diff changeset	281 }

Mercurial > projects > dwt2

annotate org.eclipse.jface.text/src/org/eclipse/jface/internal/text/revisions/Colors.d @ 12:bc29606a740c