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annotate dwtx/draw2d/Polyline.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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children 2d6540440fe6
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98
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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.Polyline;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17
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18 import dwtx.draw2d.geometry.Point;
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19 import dwtx.draw2d.geometry.PointList;
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20 import dwtx.draw2d.geometry.Rectangle;
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21 import dwtx.draw2d.Shape;
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22 import dwtx.draw2d.Graphics;
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23 import dwtx.draw2d.IFigure;
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24 import dwtx.draw2d.Connection;
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25
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26 /**
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27 * Renders a {@link PointList} as a series of line segments. A Polyline figure should be
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28 * positioned by manipulating its points, <EM>NOT</EM> by calling
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29 * {@link Figure#setBounds(Rectangle)}.
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30 * <P>
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31 * A polyline's bounds will be calculated automatically based on its PointList. The
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32 * bounds will be the smallest Rectangle large enough to render the line properly.
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33 * Children should not be added to a Polyline and will not affect the bounds calculation.
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34 */
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35 public class Polyline
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36 : Shape
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37 {
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38
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39 PointList points;
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40 private int tolerance = 2;
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41 private static const Rectangle LINEBOUNDS;
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42
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43 static this(){
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44 LINEBOUNDS = Rectangle.SINGLETON;
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45 assert( LINEBOUNDS !is null );
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46 }
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47
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48 this(){
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49 points = new PointList();
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50 setFill(false);
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51 bounds = null;
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52 }
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53
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54 /**
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55 * Adds the passed point to the Polyline.
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56 *
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57 * @param pt the Point to be added to the Polyline
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58 * @since 2.0
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59 */
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60 public void addPoint(Point pt) {
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61 points.addPoint(pt);
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62 bounds = null;
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63 repaint();
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64 }
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65
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66 /**
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67 * @see dwtx.draw2d.IFigure#containsPoint(int, int)
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68 */
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69 public bool containsPoint(int x, int y) {
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70 int tolerance = Math.max(lineWidth / 2, this.tolerance);
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71 LINEBOUNDS.setBounds(getBounds());
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72 LINEBOUNDS.expand(tolerance, tolerance);
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73 if (!LINEBOUNDS.contains(x, y))
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74 return false;
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75 int ints[] = points.toIntArray();
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76 for (int index = 0; index < ints.length - 3; index += 2) {
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77 if (lineContainsPoint(ints[index], ints[index + 1],
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78 ints[index + 2], ints[index + 3], x, y, tolerance))
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79 return true;
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80 }
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81 List children = getChildren();
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82 for (int i = 0; i < children.size(); i++) {
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83 if ((cast(IFigure)children.get(i)).containsPoint(x, y))
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84 return true;
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85 }
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86 return false;
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87 }
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88
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89 private bool lineContainsPoint(
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90 int x1, int y1,
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91 int x2, int y2,
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92 int px, int py,
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93 int tolerance) {
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94 LINEBOUNDS.setSize(0, 0);
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95 LINEBOUNDS.setLocation(x1, y1);
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96 LINEBOUNDS.union_(x2, y2);
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97 LINEBOUNDS.expand(tolerance, tolerance);
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98 if (!LINEBOUNDS.contains(px, py))
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99 return false;
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100
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101 int v1x, v1y, v2x, v2y;
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102 int numerator, denominator;
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103 int result = 0;
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104
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105 /**
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106 * calculates the length squared of the cross product of two vectors, v1 & v2.
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107 */
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108 if (x1 !is x2 && y1 !is y2) {
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109 v1x = x2 - x1;
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110 v1y = y2 - y1;
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111 v2x = px - x1;
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112 v2y = py - y1;
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113
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114 numerator = v2x * v1y - v1x * v2y;
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115
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116 denominator = v1x * v1x + v1y * v1y;
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117
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118 result = cast(int)(cast(long)numerator * numerator / denominator);
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119 }
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120
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121 // if it is the same point, and it passes the bounding box test,
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122 // the result is always true.
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123 return result <= tolerance * tolerance;
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124
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125 }
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126
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127 /**
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128 * Null implementation for a line.
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129 * @see dwtx.draw2d.Shape#fillShape(Graphics)
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130 */
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131 protected void fillShape(Graphics g) { }
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132
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133 /**
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134 * @see dwtx.draw2d.IFigure#getBounds()
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135 */
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136 public Rectangle getBounds() {
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137 if (bounds is null) {
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138 bounds = getPoints()
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139 .getBounds()
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140 .getExpanded(lineWidth / 2, lineWidth / 2);
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141 }
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142 return bounds;
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143 }
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144
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145 /**
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146 * Returns the last point in the Polyline.
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147 * @since 2.0
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148 * @return the last point
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149 */
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150 public Point getEnd() {
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151 return points.getLastPoint();
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152 }
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153
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154 /**
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155 * Returns the points in this Polyline <B>by reference</B>. If the returned list is
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156 * modified, this Polyline must be informed by calling {@link #setPoints(PointList)}.
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157 * Failure to do so will result in layout and paint problems.
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158 *
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159 * @return this Polyline's points
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160 * @since 2.0
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161 */
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162 public PointList getPoints() {
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163 return points;
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164 }
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165
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166 /**
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167 * @return the first point in the Polyline
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168 * @since 2.0
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169 */
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170 public Point getStart() {
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171 return points.getFirstPoint();
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172 }
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173
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174 /**
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175 * Inserts a given point at a specified index in the Polyline.
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176 *
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177 * @param pt the point to be added
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178 * @param index the position in the Polyline where the point is to be added
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179 *
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180 * @since 2.0
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181 */
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182 public void insertPoint(Point pt, int index) {
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183 bounds = null;
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184 points.insertPoint(pt, index);
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185 repaint();
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186 }
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187
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188 /**
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189 * @return <code>false</code> because Polyline's aren't filled
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190 */
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191 public bool isOpaque() {
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192 return false;
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193 }
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194
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195 /**
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196 * @see Shape#outlineShape(Graphics)
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197 */
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198 protected void outlineShape(Graphics g) {
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199 g.drawPolyline(points);
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200 }
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201
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202 /**
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203 * @see Figure#primTranslate(int, int)
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204 */
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205 public void primTranslate(int x, int y) { }
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206
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207 /**
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208 * Erases the Polyline and removes all of its {@link Point Points}.
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209 *
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210 * @since 2.0
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211 */
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212 public void removeAllPoints() {
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213 erase();
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214 bounds = null;
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215 points.removeAllPoints();
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216 }
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217
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218 /**
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219 * Removes a point from the Polyline.
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220 *
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221 * @param index the position of the point to be removed
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222 * @since 2.0
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223 */
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224 public void removePoint(int index) {
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225 erase();
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226 bounds = null;
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227 points.removePoint(index);
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228 }
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229
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230 /**
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231 * Sets the end point of the Polyline
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232 *
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233 * @param end the point that will become the last point in the Polyline
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234 * @since 2.0
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235 */
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236 public void setEnd(Point end) {
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237 if (points.size() < 2)
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238 addPoint(end);
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239 else
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240 setPoint(end, points.size() - 1);
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241 }
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242
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243 /**
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244 * Sets the points at both extremes of the Polyline
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245 *
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246 * @param start the point to become the first point in the Polyline
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247 * @param end the point to become the last point in the Polyline
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248 * @since 2.0
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249 */
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250 public void setEndpoints(Point start, Point end) {
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251 setStart(start);
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252 setEnd(end);
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253 }
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254
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255 /**
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256 * @see dwtx.draw2d.Shape#setLineWidth(int)
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257 */
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258 public void setLineWidth(int w) {
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259 if (lineWidth is w)
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260 return;
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261 if (w < lineWidth) //The bounds will become smaller, so erase must occur first.
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262 erase();
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263 bounds = null;
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264 super.setLineWidth(w);
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265 }
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266
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267 /**
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268 * Sets the point at <code>index</code> to the Point <code>pt</code>. Calling this method
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269 * results in a recalculation of the polyline's bounding box. If you're going to set
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270 * multiple Points, use {@link #setPoints(PointList)}.
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271 * @param pt the point
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272 * @param index the index
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273 */
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274 public void setPoint(Point pt, int index) {
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275 erase();
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276 points.setPoint(pt, index);
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277 bounds = null;
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278 repaint();
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279 }
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280
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281 /**
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282 * Sets the list of points to be used by this polyline connection. Removes any previously
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283 * existing points. The polyline will hold onto the given list by reference.
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284 *
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285 * @param points new set of points
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286 * @since 2.0
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287 */
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288 public void setPoints(PointList points) {
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289 erase();
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290 this.points = points;
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291 bounds = null;
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292 firePropertyChange(Connection.PROPERTY_POINTS, null, points);
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293 repaint();
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294 }
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295
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296 /**
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297 * Sets the start point of the Polyline
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298 *
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299 * @param start the point that will become the first point in the Polyline
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300 * @since 2.0
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301 */
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302 public void setStart(Point start) {
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303 if (points.size() is 0)
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304 addPoint(start);
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305 else
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306 setPoint(start, 0);
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307 }
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308
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309 /**
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310 * Sets the tolerance
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311 *
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312 * @param tolerance the new tolerance value of the Polyline
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313 */
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314 public void setTolerance(int tolerance) {
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315 this.tolerance = tolerance;
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316 }
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317 }