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annotate dwtx/draw2d/FigureUtilities.d @ 101:1082a0fc2bb8

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First Draw2D example running
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 02:17:46 +0200
parents 95307ad235d9
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.FigureUtilities;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.dwtxhelper.Collection;
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18
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19 import dwt.graphics.Color;
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20 import dwt.graphics.Font;
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21 import dwt.graphics.FontMetrics;
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22 import dwt.graphics.GC;
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23 import dwt.widgets.Shell;
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24 import dwtx.draw2d.geometry.Dimension;
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25 import dwtx.draw2d.geometry.Rectangle;
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26 import dwtx.draw2d.Shape;
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27 import dwtx.draw2d.IFigure;
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28 import dwtx.draw2d.Graphics;
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29 static import dwtx.draw2d.geometry.Point;
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30 /**
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31 * Provides miscellaneous Figure operations.
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32 */
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33 public class FigureUtilities {
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34
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35 private static final float RGB_VALUE_MULTIPLIER = 0.6f;
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36 private static GC gc;
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37 private static Font appliedFont;
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38 private static FontMetrics metrics;
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39
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40 private static Color ghostFillColor_;
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41 private static Color ghostFillColor(){
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42 if( ghostFillColor_ is null ){
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43 synchronized( FigureUtilities.classinfo ){
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44 if( ghostFillColor_ is null ){
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45 ghostFillColor_ = new Color(null, 31, 31, 31);
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46 }
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47 }
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48 }
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49 return ghostFillColor_;
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50 }
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51
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52 /**
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53 * Returns a new Color the same as the passed color in a darker hue.
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54 *
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55 * @param color the color to darken
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56 * @return the darkened color
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57 * @since 2.0
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58 */
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59 public static Color darker(Color color) {
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60 return new Color(null,
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61 cast(int)(color.getRed() * RGB_VALUE_MULTIPLIER),
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62 cast(int)(color.getGreen() * RGB_VALUE_MULTIPLIER),
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63 cast(int)(color.getBlue() * RGB_VALUE_MULTIPLIER));
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64 }
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65
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66 /**
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67 * Returns the FontMetrics associated with the passed Font.
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68 *
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69 * @param f the font
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70 * @return the FontMetrics for the given font
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71 * @see GC#getFontMetrics()
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72 * @since 2.0
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73 */
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74 public static FontMetrics getFontMetrics(Font f) {
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75 setFont(f);
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76 if (metrics is null)
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77 metrics = getGC().getFontMetrics();
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78 return metrics;
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79 }
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80
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81 /**
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82 * Returns the GC used for various utilities. Advanced graphics must not be switched on by
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83 * clients using this GC.
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84 * @deprecated do not mess with this GC
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85 * @return the GC
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86 */
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87 protected static GC getGC() {
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88 if (gc is null) {
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89 gc = new GC(new Shell());
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90 appliedFont = gc.getFont();
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91 }
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92 return gc;
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93 }
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94
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95 /**
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96 * Returns the dimensions of the String <i>s</i> using the font <i>f</i>. Tab expansion
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97 * and carriage return processing are performed.
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98 * @param s the string
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99 * @param f the font
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100 * @return the text's dimensions
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101 * @see GC#textExtent(String)
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102 */
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103 protected static dwt.graphics.Point.Point getTextDimension(String s, Font f) {
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104 setFont(f);
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105 return getGC().textExtent(s);
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106 }
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107
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108 /**
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109 * Returns the highest ancestor for the given figure
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110 * @since 3.0
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111 * @param figure a figure
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112 * @return the root ancestor
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113 */
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114 public static IFigure getRoot(IFigure figure) {
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115 while (figure.getParent() !is null)
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116 figure = figure.getParent();
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117 return figure;
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118 }
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119
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120 /**
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121 * Returns the dimensions of the String <i>s</i> using the font <i>f</i>. No tab
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122 * expansion or carriage return processing will be performed.
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123 * @param s the string
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124 * @param f the font
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125 * @return the string's dimensions
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126 * @see GC#stringExtent(java.lang.String)
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127 */
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128 protected static dwt.graphics.Point.Point getStringDimension(String s, Font f) {
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129 setFont(f);
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130 return getGC().stringExtent(s);
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131 }
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132
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133 /**
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134 * Returns the Dimensions of the given text, converting newlines and tabs appropriately.
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135 *
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136 * @param text the text
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137 * @param f the font
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138 * @return the dimensions of the given text
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139 * @since 2.0
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140 */
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141 public static Dimension getTextExtents(String text, Font f) {
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142 return new Dimension(getTextDimension(text, f));
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143 }
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144
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145 /**
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146 * Returns the Dimensions of <i>s</i> in Font <i>f</i>.
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147 *
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148 * @param s the string
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149 * @param f the font
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150 * @return the dimensions of the given string
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151 * @since 2.0
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152 */
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153 public static Dimension getStringExtents(String s, Font f) {
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154 return new Dimension(getStringDimension(s, f));
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155 }
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156
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157 /**
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158 * Returns the Dimensions of the given text, converting newlines and tabs appropriately.
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159 *
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160 * @param s the string
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161 * @param f the font
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162 * @param result the Dimension that will contain the result of this calculation
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163 * @since 2.0
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164 */
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165 public static void getTextExtents(String s, Font f, Dimension result) {
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166 dwt.graphics.Point.Point pt = getTextDimension(s, f);
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167 result.width = pt.x;
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168 result.height = pt.y;
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169 }
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170
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171 /**
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172 * Returns the width of <i>s</i> in Font <i>f</i>.
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173 *
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174 * @param s the string
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175 * @param f the font
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176 * @return the width
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177 * @since 2.0
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178 */
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179 public static int getTextWidth(String s, Font f) {
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180 return getTextDimension(s, f).x;
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181 }
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182
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183 /**
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184 * Returns a Color the same as the passed color in a lighter hue.
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185 *
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186 * @param rgb the color
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187 * @return the lighter color
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188 * @since 2.0
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189 */
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190 public static Color lighter(Color rgb) {
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191 int r = rgb.getRed(),
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192 g = rgb.getGreen(),
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193 b = rgb.getBlue();
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194
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195 return new Color(null,
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196 Math.max(2, Math.min(cast(int)(r / RGB_VALUE_MULTIPLIER), 255)),
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197 Math.max(2, Math.min(cast(int)(g / RGB_VALUE_MULTIPLIER), 255)),
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198 Math.max(2, Math.min(cast(int)(b / RGB_VALUE_MULTIPLIER), 255))
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199 );
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200 }
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201
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202 /**
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203 * Produces a ghosting effect on the shape <i>s</i>.
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204 *
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205 * @param s the shape
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206 * @return the ghosted shape
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207 * @since 2.0
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208 */
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209 public static Shape makeGhostShape(Shape s) {
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210 s.setBackgroundColor(ghostFillColor);
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211 s.setFillXOR(true);
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212 s.setOutlineXOR(true);
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213 return s;
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214 }
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215
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216 /**
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217 * Mixes the passed Colors and returns the resulting Color.
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218 *
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219 * @param c1 the first color
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220 * @param c2 the second color
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221 * @param weight the first color's weight from 0-1
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222 * @return the new color
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223 * @since 2.0
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224 */
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225 public static Color mixColors(Color c1, Color c2, double weight) {
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226 return new Color(null,
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227 cast(int)(c1.getRed() * weight + c2.getRed() * (1 - weight)),
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228 cast(int)(c1.getGreen() * weight + c2.getGreen() * (1 - weight)),
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229 cast(int)(c1.getBlue() * weight + c2.getBlue() * (1 - weight)));
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230 }
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231
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232
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233 /**
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234 * Mixes the passed Colors and returns the resulting Color.
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235 *
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236 * @param c1 the first color
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237 * @param c2 the second color
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238 * @return the new color
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239 * @since 2.0
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240 */
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241 public static Color mixColors(Color c1, Color c2) {
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242 return new Color(null,
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243 (c1.getRed() + c2.getRed()) / 2,
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244 (c1.getGreen() + c2.getGreen()) / 2,
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245 (c1.getBlue() + c2.getBlue()) / 2);
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246 }
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247
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248 /**
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249 * Paints a border with an etching effect, having a shadow of Color <i>shadow</i> and
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250 * highlight of Color <i>highlight</i>.
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251 *
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252 * @param g the graphics object
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253 * @param r the bounds of the border
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254 * @param shadow the shadow color
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255 * @param highlight the highlight color
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256 * @since 2.0
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257 */
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258 public static void paintEtchedBorder(Graphics g, Rectangle r,
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259 Color shadow, Color highlight) {
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260 int x = r.x,
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261 y = r.y,
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262 w = r.width,
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263 h = r.height;
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264
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265 g.setLineStyle(Graphics.LINE_SOLID);
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266 g.setLineWidth(1);
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267 g.setXORMode(false);
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268
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269 w -= 2;
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270 h -= 2;
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271
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272 g.setForegroundColor(shadow);
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273 g.drawRectangle(x, y, w, h);
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274
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275 x++;
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276 y++;
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277 g.setForegroundColor(highlight);
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278 g.drawRectangle(x, y, w, h);
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279 }
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280
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281 /**
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282 * Helper method to paint a grid. Painting is optimized as it is restricted to the
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283 * Graphics' clip.
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284 *
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285 * @param g The Graphics object to be used for painting
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286 * @param f The figure in which the grid is to be painted
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287 * @param origin Any point where the grid lines are expected to intersect
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288 * @param distanceX Distance between vertical grid lines; if 0 or less, vertical grid
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289 * lines will not be drawn
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290 * @param distanceY Distance between horizontal grid lines; if 0 or less, horizontal
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291 * grid lines will not be drawn
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292 *
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293 * @since 3.0
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294 */
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295 public static void paintGrid(Graphics g, IFigure f,
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296 dwtx.draw2d.geometry.Point.Point origin, int distanceX, int distanceY) {
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297 Rectangle clip = g.getClip(Rectangle.SINGLETON);
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298
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299 if (distanceX > 0) {
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300 if (origin.x >= clip.x)
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301 while (origin.x - distanceX >= clip.x)
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302 origin.x -= distanceX;
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303 else
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304 while (origin.x < clip.x)
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305 origin.x += distanceX;
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306 for (int i = origin.x; i < clip.x + clip.width; i += distanceX)
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307 g.drawLine(i, clip.y, i, clip.y + clip.height);
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308 }
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309
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310 if (distanceY > 0) {
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311 if (origin.y >= clip.y)
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312 while (origin.y - distanceY >= clip.y)
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313 origin.y -= distanceY;
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314 else
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315 while (origin.y < clip.y)
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316 origin.y += distanceY;
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317 for (int i = origin.y; i < clip.y + clip.height; i += distanceY)
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318 g.drawLine(clip.x, i, clip.x + clip.width, i);
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319 }
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320 }
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321
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322 /**
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323 * Paints a border with an etching effect, having a shadow of a darker version of g's
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324 * background color, and a highlight a lighter version of g's background color.
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325 *
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326 * @param g the graphics object
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327 * @param r the bounds of the border
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328 * @since 2.0
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329 */
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330 public static void paintEtchedBorder(Graphics g, Rectangle r) {
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331 Color rgb = g.getBackgroundColor(),
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332 shadow = darker(rgb),
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333 highlight = lighter(rgb);
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334 paintEtchedBorder(g, r, shadow, highlight);
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335 }
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336
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337 /**
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338 * Sets Font to passed value.
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339 *
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340 * @param f the new font
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341 * @since 2.0
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342 */
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343 protected static void setFont(Font f) {
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344 if (appliedFont is f || f.opEquals(appliedFont))
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345 return;
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346 getGC().setFont(f);
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347 appliedFont = f;
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348 metrics = null;
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349 }
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350
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351 /**
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352 * Returns the figure which is the ancestor of both figures, or <code>null</code>. A
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353 * figure is an ancestor if it is the parent of another figure, or if it is the ancestor
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354 * of that figure's parent. If one figure contains the other, <code>null</code> is
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355 * returned.
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356 * @since 3.1
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357 * @param l left
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358 * @param r right
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359 * @return the common ancestor
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360 */
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361 public static IFigure findCommonAncestor(IFigure l, IFigure r) {
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362 if (l is r)
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363 return l;
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364 ArrayList left = new ArrayList();
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365 ArrayList right = new ArrayList();
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366 while (l !is null) {
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367 left.add(cast(Object)l);
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368 l = l.getParent();
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369 }
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370 while (r !is null) {
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371 right.add(cast(Object)r);
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372 r = r.getParent();
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373 }
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374 if (left.isEmpty() || right.isEmpty())
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375 return null;
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376
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377 int il = left.size() - 1;
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378 int ir = right.size() - 1;
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379 do {
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380 if (left.get(il) !is right.get(ir))
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381 break;
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382 il--;
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383 ir--;
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384 } while (il >= 0 && ir >= 0);
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385
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386 return cast(IFigure) left.get(il + 1);
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387 }
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388
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389 /**
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390 * Returns <code>true</code> if the ancestor contains the descendant, or is the ancestor
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391 * of the descendant's parent.
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392 * @param ancestor the ancestor
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393 * @param descendant the descendant
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394 * @return <code>true</code> if ancestor
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395 * @since 3.2
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396 */
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397 public static bool isAncestor(IFigure ancestor, IFigure descendant) {
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398 while (descendant !is null) {
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399 descendant = descendant.getParent();
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400 if (descendant is ancestor)
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401 return true;
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402 }
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403 return false;
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404 }
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405
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406 }