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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 org.eclipse.swt.graphics.Path;
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14
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15 import org.eclipse.swt.SWT;
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16 import org.eclipse.swt.internal.Compatibility;
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54
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17 import org.eclipse.swt.internal.cairo.Cairo : Cairo;
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18 import org.eclipse.swt.internal.gtk.OS;
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25
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19 import org.eclipse.swt.graphics.Resource;
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20 import org.eclipse.swt.graphics.Device;
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21 import org.eclipse.swt.graphics.Font;
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22 import org.eclipse.swt.graphics.GC;
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23 import org.eclipse.swt.graphics.GCData;
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24 import org.eclipse.swt.graphics.PathData;
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25 import java.lang.all;
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26
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26
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27 version(Tango){
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28 import tango.stdc.string;
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29 } else {
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30 import std.c.string;
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31 }
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25
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32
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33 /**
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34 * Instances of this class represent paths through the two-dimensional
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35 * coordinate system. Paths do not have to be continuous, and can be
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36 * described using lines, rectangles, arcs, cubic or quadratic bezier curves,
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37 * glyphs, or other paths.
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38 * <p>
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39 * Application code must explicitly invoke the <code>Path.dispose()</code>
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40 * method to release the operating system resources managed by each instance
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41 * when those instances are no longer required.
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42 * </p>
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43 * <p>
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44 * This class requires the operating system's advanced graphics subsystem
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45 * which may not be available on some platforms.
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46 * </p>
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47 *
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48 * @see <a href="http://www.eclipse.org/swt/snippets/#path">Path, Pattern snippets</a>
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49 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a>
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50 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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51 *
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52 * @since 3.1
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53 */
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54 public class Path : Resource {
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55 alias Resource.init_ init_;
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56 /**
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57 * the OS resource for the Path
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58 * (Warning: This field is platform dependent)
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59 * <p>
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60 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
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61 * public API. It is marked public only so that it can be shared
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62 * within the packages provided by SWT. It is not available on all
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63 * platforms and should never be accessed from application code.
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64 * </p>
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65 */
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113
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66 public org.eclipse.swt.internal.gtk.OS.cairo_t* handle;
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67
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68 bool moved, closed = true;
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69
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70 /**
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71 * Constructs a new empty Path.
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72 * <p>
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73 * This operation requires the operating system's advanced
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74 * graphics subsystem which may not be available on some
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75 * platforms.
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76 * </p>
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77 *
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78 * @param device the device on which to allocate the path
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79 *
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80 * @exception IllegalArgumentException <ul>
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81 * <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li>
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82 * </ul>
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83 * @exception SWTException <ul>
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84 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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85 * </ul>
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86 * @exception SWTError <ul>
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87 * <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li>
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88 * </ul>
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89 *
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90 * @see #dispose()
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91 */
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92 public this (Device device) {
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93 super(device);
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94 this.device.checkCairo();
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95 auto surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_ARGB32, 1, 1);
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96 if (surface is null) SWT.error(SWT.ERROR_NO_HANDLES);
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97 handle = Cairo.cairo_create(surface);
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98 Cairo.cairo_surface_destroy(surface);
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99 if (handle is null) SWT.error(SWT.ERROR_NO_HANDLES);
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100 init_();
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101 }
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102
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103 /**
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104 * Constructs a new Path that is a copy of <code>path</code>. If
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105 * <code>flatness</code> is less than or equal to zero, an unflatten
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106 * copy of the path is created. Otherwise, it specifies the maximum
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107 * error between the path and its flatten copy. Smaller numbers give
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108 * better approximation.
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109 * <p>
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110 * This operation requires the operating system's advanced
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111 * graphics subsystem which may not be available on some
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112 * platforms.
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113 * </p>
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114 *
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115 * @param device the device on which to allocate the path
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116 * @param path the path to make a copy
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117 * @param flatness the flatness value
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118 *
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119 * @exception IllegalArgumentException <ul>
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120 * <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li>
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121 * <li>ERROR_NULL_ARGUMENT - if the path is null</li>
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122 * <li>ERROR_INVALID_ARGUMENT - if the path has been disposed</li>
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123 * </ul>
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124 * @exception SWTException <ul>
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125 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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126 * </ul>
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127 * @exception SWTError <ul>
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128 * <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li>
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129 * </ul>
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130 *
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131 * @see #dispose()
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132 * @since 3.4
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133 */
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134 public this (Device device, Path path, float flatness) {
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135 super(device);
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136 if (path is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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137 if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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138 auto surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_ARGB32, 1, 1);
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139 if (surface is null) SWT.error(SWT.ERROR_NO_HANDLES);
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140 handle = Cairo.cairo_create(surface);
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141 Cairo.cairo_surface_destroy(surface);
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142 if (handle is null) SWT.error(SWT.ERROR_NO_HANDLES);
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143 cairo_path_t* copy;
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144 flatness = Math.max(0, flatness);
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145 if (flatness is 0) {
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146 copy = Cairo.cairo_copy_path(path.handle);
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147 } else {
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148 double tolerance = Cairo.cairo_get_tolerance(path.handle);
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149 Cairo.cairo_set_tolerance(path.handle, flatness);
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150 copy = Cairo.cairo_copy_path_flat(path.handle);
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151 Cairo.cairo_set_tolerance(path.handle, tolerance);
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152 }
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153 if (copy is null) {
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154 Cairo.cairo_destroy(handle);
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155 SWT.error(SWT.ERROR_NO_HANDLES);
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156 }
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157 Cairo.cairo_append_path(handle, copy);
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158 Cairo.cairo_path_destroy(copy);
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159 init_();
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160 }
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161
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162 /**
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163 * Constructs a new Path with the specifed PathData.
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164 * <p>
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165 * This operation requires the operating system's advanced
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166 * graphics subsystem which may not be available on some
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167 * platforms.
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168 * </p>
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169 *
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170 * @param device the device on which to allocate the path
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171 * @param data the data for the path
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172 *
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173 * @exception IllegalArgumentException <ul>
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174 * <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li>
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175 * <li>ERROR_NULL_ARGUMENT - if the data is null</li>
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176 * </ul>
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177 * @exception SWTException <ul>
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178 * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
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179 * </ul>
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180 * @exception SWTError <ul>
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181 * <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li>
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182 * </ul>
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183 *
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184 * @see #dispose()
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185 * @since 3.4
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186 */
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187 public this (Device device, PathData data) {
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188 this(device);
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189 if (data is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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190 init_(data);
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191 }
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192
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193 /**
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194 * Adds to the receiver a circular or elliptical arc that lies within
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195 * the specified rectangular area.
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196 * <p>
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197 * The resulting arc begins at <code>startAngle</code> and extends
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198 * for <code>arcAngle</code> degrees.
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199 * Angles are interpreted such that 0 degrees is at the 3 o'clock
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200 * position. A positive value indicates a counter-clockwise rotation
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201 * while a negative value indicates a clockwise rotation.
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202 * </p><p>
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203 * The center of the arc is the center of the rectangle whose origin
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204 * is (<code>x</code>, <code>y</code>) and whose size is specified by the
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205 * <code>width</code> and <code>height</code> arguments.
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206 * </p><p>
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207 * The resulting arc covers an area <code>width + 1</code> pixels wide
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208 * by <code>height + 1</code> pixels tall.
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209 * </p>
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210 *
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211 * @param x the x coordinate of the upper-left corner of the arc
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212 * @param y the y coordinate of the upper-left corner of the arc
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213 * @param width the width of the arc
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214 * @param height the height of the arc
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215 * @param startAngle the beginning angle
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216 * @param arcAngle the angular extent of the arc, relative to the start angle
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217 *
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218 * @exception SWTException <ul>
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219 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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220 * </ul>
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221 */
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222 public void addArc(float x, float y, float width, float height, float startAngle, float arcAngle) {
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223 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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224 moved = true;
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225 if (width is height) {
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226 float angle = -startAngle * cast(float)Compatibility.PI / 180;
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227 if (closed) Cairo.cairo_move_to(handle, (x + width / 2f) + width / 2f * Math.cos(angle), (y + height / 2f) + height / 2f * Math.sin(angle));
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228 if (arcAngle >= 0) {
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229 Cairo.cairo_arc_negative(handle, x + width / 2f, y + height / 2f, width / 2f, angle, -(startAngle + arcAngle) * cast(float)Compatibility.PI / 180);
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230 } else {
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231 Cairo.cairo_arc(handle, x + width / 2f, y + height / 2f, width / 2f, angle, -(startAngle + arcAngle) * cast(float)Compatibility.PI / 180);
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232 }
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233 } else {
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234 Cairo.cairo_save(handle);
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235 Cairo.cairo_translate(handle, x + width / 2f, y + height / 2f);
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236 Cairo.cairo_scale(handle, width / 2f, height / 2f);
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237 float angle = -startAngle * cast(float)Compatibility.PI / 180;
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238 if (closed) Cairo.cairo_move_to(handle, Math.cos(angle), Math.sin(angle));
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239 if (arcAngle >= 0) {
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240 Cairo.cairo_arc_negative(handle, 0, 0, 1, angle, -(startAngle + arcAngle) * cast(float)Compatibility.PI / 180);
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241 } else {
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242 Cairo.cairo_arc(handle, 0, 0, 1, angle, -(startAngle + arcAngle) * cast(float)Compatibility.PI / 180);
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243 }
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244 Cairo.cairo_restore(handle);
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245 }
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246 closed = false;
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247 if (Math.abs(arcAngle) >= 360) close();
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248 }
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249
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250 /**
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251 * Adds to the receiver the path described by the parameter.
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252 *
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253 * @param path the path to add to the receiver
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254 *
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255 * @exception IllegalArgumentException <ul>
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256 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
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257 * <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
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258 * </ul>
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259 * @exception SWTException <ul>
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260 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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261 * </ul>
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262 */
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263 public void addPath(Path path) {
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264 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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265 if (path is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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266 if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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267 moved = false;
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268 auto copy = Cairo.cairo_copy_path(path.handle);
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269 if (copy is null) SWT.error(SWT.ERROR_NO_HANDLES);
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270 Cairo.cairo_append_path(handle, copy);
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271 Cairo.cairo_path_destroy(copy);
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272 closed = path.closed;
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273 }
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274
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275 /**
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276 * Adds to the receiver the rectangle specified by x, y, width and height.
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277 *
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278 * @param x the x coordinate of the rectangle to add
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279 * @param y the y coordinate of the rectangle to add
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280 * @param width the width of the rectangle to add
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281 * @param height the height of the rectangle to add
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282 *
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283 * @exception SWTException <ul>
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284 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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285 * </ul>
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286 */
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287 public void addRectangle(float x, float y, float width, float height) {
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288 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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289 moved = false;
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290 Cairo.cairo_rectangle(handle, x, y, width, height);
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291 closed = true;
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292 }
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293
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294 /**
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295 * Adds to the receiver the pattern of glyphs generated by drawing
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296 * the given string using the given font starting at the point (x, y).
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297 *
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298 * @param string the text to use
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299 * @param x the x coordinate of the starting point
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300 * @param y the y coordinate of the starting point
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301 * @param font the font to use
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302 *
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303 * @exception IllegalArgumentException <ul>
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304 * <li>ERROR_NULL_ARGUMENT - if the font is null</li>
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305 * <li>ERROR_INVALID_ARGUMENT - if the font has been disposed</li>
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306 * </ul>
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307 * @exception SWTException <ul>
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308 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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309 * </ul>
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310 */
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311 public void addString(String str, float x, float y, Font font) {
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312 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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313 if (font is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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314 if (font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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315 moved = false;
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316 GC.addCairoString(handle, str, x, y, font);
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317 closed = true;
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318 }
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319
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320 /**
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321 * Closes the current sub path by adding to the receiver a line
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322 * from the current point of the path back to the starting point
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323 * of the sub path.
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324 *
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325 * @exception SWTException <ul>
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326 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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327 * </ul>
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328 */
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329 public void close() {
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330 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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331 Cairo.cairo_close_path(handle);
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332 moved = false;
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333 closed = true;
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334 }
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335
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336 /**
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337 * Returns <code>true</code> if the specified point is contained by
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338 * the receiver and false otherwise.
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339 * <p>
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340 * If outline is <code>true</code>, the point (x, y) checked for containment in
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341 * the receiver's outline. If outline is <code>false</code>, the point is
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342 * checked to see if it is contained within the bounds of the (closed) area
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343 * covered by the receiver.
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344 *
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345 * @param x the x coordinate of the point to test for containment
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346 * @param y the y coordinate of the point to test for containment
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347 * @param gc the GC to use when testing for containment
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348 * @param outline controls whether to check the outline or contained area of the path
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349 * @return <code>true</code> if the path contains the point and <code>false</code> otherwise
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350 *
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351 * @exception IllegalArgumentException <ul>
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352 * <li>ERROR_NULL_ARGUMENT - if the gc is null</li>
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353 * <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</li>
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354 * </ul>
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355 * @exception SWTException <ul>
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356 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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357 * </ul>
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358 */
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359 public bool contains(float x, float y, GC gc, bool outline) {
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360 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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361 if (gc is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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362 if (gc.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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363 //TODO - see Windows
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364 gc.initCairo();
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365 gc.checkGC(GC.LINE_CAP | GC.LINE_JOIN | GC.LINE_STYLE | GC.LINE_WIDTH);
|
|
|
366 bool result = false;
|
|
|
367 auto cairo = gc.data.cairo;
|
|
|
368 auto copy = Cairo.cairo_copy_path(handle);
|
|
|
369 if (copy is null) SWT.error(SWT.ERROR_NO_HANDLES);
|
|
|
370 Cairo.cairo_append_path(cairo, copy);
|
|
|
371 Cairo.cairo_path_destroy(copy);
|
|
|
372 if (outline) {
|
|
|
373 result = Cairo.cairo_in_stroke(cairo, x, y) !is 0;
|
|
|
374 } else {
|
|
|
375 result = Cairo.cairo_in_fill(cairo, x, y) !is 0;
|
|
|
376 }
|
|
|
377 Cairo.cairo_new_path(cairo);
|
|
|
378 return result;
|
|
|
379 }
|
|
|
380
|
|
|
381 /**
|
|
|
382 * Adds to the receiver a cubic bezier curve based on the parameters.
|
|
|
383 *
|
|
|
384 * @param cx1 the x coordinate of the first control point of the spline
|
|
|
385 * @param cy1 the y coordinate of the first control of the spline
|
|
|
386 * @param cx2 the x coordinate of the second control of the spline
|
|
|
387 * @param cy2 the y coordinate of the second control of the spline
|
|
|
388 * @param x the x coordinate of the end point of the spline
|
|
|
389 * @param y the y coordinate of the end point of the spline
|
|
|
390 *
|
|
|
391 * @exception SWTException <ul>
|
|
|
392 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
393 * </ul>
|
|
|
394 */
|
|
|
395 public void cubicTo(float cx1, float cy1, float cx2, float cy2, float x, float y) {
|
|
|
396 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
397 if (!moved) {
|
|
|
398 double currentX, currentY;
|
|
|
399 Cairo.cairo_get_current_point(handle, ¤tX, ¤tY);
|
|
|
400 Cairo.cairo_move_to(handle, currentX, currentY);
|
|
|
401 moved = true;
|
|
|
402 }
|
|
|
403 Cairo.cairo_curve_to(handle, cx1, cy1, cx2, cy2, x, y);
|
|
|
404 closed = false;
|
|
|
405 }
|
|
|
406
|
|
|
407 /**
|
|
|
408 * Replaces the first four elements in the parameter with values that
|
|
|
409 * describe the smallest rectangle that will completely contain the
|
|
|
410 * receiver (i.e. the bounding box).
|
|
|
411 *
|
|
|
412 * @param bounds the array to hold the result
|
|
|
413 *
|
|
|
414 * @exception IllegalArgumentException <ul>
|
|
|
415 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
|
|
|
416 * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the bounding box</li>
|
|
|
417 * </ul>
|
|
|
418 * @exception SWTException <ul>
|
|
|
419 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
420 * </ul>
|
|
|
421 */
|
|
|
422 public void getBounds(float[] bounds) {
|
|
|
423 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
424 if (bounds is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
|
|
|
425 if (bounds.length < 4) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
426 auto copy = Cairo.cairo_copy_path(handle);
|
|
|
427 if (copy is null) SWT.error(SWT.ERROR_NO_HANDLES);
|
|
|
428 cairo_path_t* path = new cairo_path_t();
|
|
|
429 memmove(path, copy, cairo_path_t.sizeof);
|
|
|
430 double minX = 0, minY = 0, maxX = 0, maxY = 0;
|
|
|
431 if (path.num_data > 0) {
|
|
|
432 minX = minY = double.max;
|
|
|
433 maxX = maxY = -double.max;
|
|
|
434 int i = 0;
|
|
|
435 cairo_path_data_t* data = new cairo_path_data_t();
|
|
|
436 while (i < path.num_data) {
|
|
|
437 *data = path.data[i];
|
|
|
438 switch (data.header.type) {
|
|
|
439 case Cairo.CAIRO_PATH_MOVE_TO:
|
|
|
440 minX = Math.min(minX, path.data[i+1].point.x);
|
|
|
441 minY = Math.min(minY, path.data[i+1].point.y);
|
|
|
442 maxX = Math.max(maxX, path.data[i+1].point.x);
|
|
|
443 maxY = Math.max(maxY, path.data[i+1].point.y);
|
|
|
444 break;
|
|
|
445 case Cairo.CAIRO_PATH_LINE_TO:
|
|
|
446 minX = Math.min(minX, path.data[i+1].point.x);
|
|
|
447 minY = Math.min(minY, path.data[i+1].point.y);
|
|
|
448 maxX = Math.max(maxX, path.data[i+1].point.x);
|
|
|
449 maxY = Math.max(maxY, path.data[i+1].point.y);
|
|
|
450 break;
|
|
|
451 case Cairo.CAIRO_PATH_CURVE_TO:
|
|
|
452 minX = Math.min(minX, path.data[i+1].point.x);
|
|
|
453 minY = Math.min(minY, path.data[i+1].point.y);
|
|
|
454 maxX = Math.max(maxX, path.data[i+1].point.x);
|
|
|
455 maxY = Math.max(maxY, path.data[i+1].point.y);
|
|
|
456 minX = Math.min(minX, path.data[i+2].point.x);
|
|
|
457 minY = Math.min(minY, path.data[i+2].point.y);
|
|
|
458 maxX = Math.max(maxX, path.data[i+2].point.x);
|
|
|
459 maxY = Math.max(maxY, path.data[i+2].point.y);
|
|
|
460 minX = Math.min(minX, path.data[i+3].point.x);
|
|
|
461 minY = Math.min(minY, path.data[i+3].point.y);
|
|
|
462 maxX = Math.max(maxX, path.data[i+3].point.x);
|
|
|
463 maxY = Math.max(maxY, path.data[i+3].point.y);
|
|
|
464 break;
|
|
|
465 case Cairo.CAIRO_PATH_CLOSE_PATH: break;
|
|
|
466 default:
|
|
|
467 }
|
|
|
468 i += data.header.length;
|
|
|
469 }
|
|
|
470 }
|
|
|
471 bounds[0] = cast(float)minX;
|
|
|
472 bounds[1] = cast(float)minY;
|
|
|
473 bounds[2] = cast(float)(maxX - minX);
|
|
|
474 bounds[3] = cast(float)(maxY - minY);
|
|
|
475 Cairo.cairo_path_destroy(copy);
|
|
|
476 }
|
|
|
477
|
|
|
478 /**
|
|
|
479 * Replaces the first two elements in the parameter with values that
|
|
|
480 * describe the current point of the path.
|
|
|
481 *
|
|
|
482 * @param point the array to hold the result
|
|
|
483 *
|
|
|
484 * @exception IllegalArgumentException <ul>
|
|
|
485 * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
|
|
|
486 * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the end point</li>
|
|
|
487 * </ul>
|
|
|
488 * @exception SWTException <ul>
|
|
|
489 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
490 * </ul>
|
|
|
491 */
|
|
|
492 public void getCurrentPoint(float[] point) {
|
|
|
493 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
494 if (point is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
|
|
|
495 if (point.length < 2) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
496 double x, y;
|
|
|
497 Cairo.cairo_get_current_point(handle, &x, &y);
|
|
|
498 point[0] = cast(float)x;
|
|
|
499 point[1] = cast(float)y;
|
|
|
500 }
|
|
|
501
|
|
|
502 /**
|
|
|
503 * Returns a device independent representation of the receiver.
|
|
|
504 *
|
|
|
505 * @return the PathData for the receiver
|
|
|
506 *
|
|
|
507 * @exception SWTException <ul>
|
|
|
508 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
509 * </ul>
|
|
|
510 *
|
|
|
511 * @see PathData
|
|
|
512 */
|
|
|
513 public PathData getPathData() {
|
|
|
514 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
515 auto copy = Cairo.cairo_copy_path(handle);
|
|
|
516 if (copy is null) SWT.error(SWT.ERROR_NO_HANDLES);
|
|
|
517 cairo_path_t* path = new cairo_path_t();
|
|
|
518 *path = *copy;
|
|
|
519 byte[] types = new byte[path.num_data];
|
|
|
520 float[] pts = new float[path.num_data * 6];
|
|
|
521 int typeIndex = 0, ptsIndex = 0;
|
|
|
522 if (path.num_data > 0) {
|
|
|
523 int i = 0;
|
|
|
524 double[] points = new double[6];
|
|
|
525 cairo_path_data_t* data = new cairo_path_data_t();
|
|
|
526 while (i < path.num_data) {
|
|
|
527 switch (data.header.type) {
|
|
|
528 case Cairo.CAIRO_PATH_MOVE_TO:
|
|
|
529 types[typeIndex++] = SWT.PATH_MOVE_TO;
|
|
|
530 pts[ptsIndex++] = cast(float)path.data[i+1].point.x;
|
|
|
531 pts[ptsIndex++] = cast(float)path.data[i+1].point.y;
|
|
|
532 break;
|
|
|
533 case Cairo.CAIRO_PATH_LINE_TO:
|
|
|
534 types[typeIndex++] = SWT.PATH_LINE_TO;
|
|
|
535 pts[ptsIndex++] = cast(float)path.data[i+1].point.x;
|
|
|
536 pts[ptsIndex++] = cast(float)path.data[i+1].point.y;
|
|
|
537 break;
|
|
|
538 case Cairo.CAIRO_PATH_CURVE_TO:
|
|
|
539 types[typeIndex++] = SWT.PATH_CUBIC_TO;
|
|
|
540 pts[ptsIndex++] = cast(float)path.data[i+1].point.x;
|
|
|
541 pts[ptsIndex++] = cast(float)path.data[i+1].point.y;
|
|
|
542 pts[ptsIndex++] = cast(float)path.data[i+2].point.x;
|
|
|
543 pts[ptsIndex++] = cast(float)path.data[i+2].point.y;
|
|
|
544 pts[ptsIndex++] = cast(float)path.data[i+3].point.x;
|
|
|
545 pts[ptsIndex++] = cast(float)path.data[i+3].point.y;
|
|
|
546 break;
|
|
|
547 case Cairo.CAIRO_PATH_CLOSE_PATH:
|
|
|
548 types[typeIndex++] = SWT.PATH_CLOSE;
|
|
|
549 break;
|
|
|
550 default:
|
|
|
551 }
|
|
|
552 i += data.header.length;
|
|
|
553 }
|
|
|
554 }
|
|
|
555 if (typeIndex !is types.length) {
|
|
|
556 byte[] newTypes = new byte[typeIndex];
|
|
|
557 System.arraycopy(types, 0, newTypes, 0, typeIndex);
|
|
|
558 types = newTypes;
|
|
|
559 }
|
|
|
560 if (ptsIndex !is pts.length) {
|
|
|
561 float[] newPts = new float[ptsIndex];
|
|
|
562 System.arraycopy(pts, 0, newPts, 0, ptsIndex);
|
|
|
563 pts = newPts;
|
|
|
564 }
|
|
|
565 Cairo.cairo_path_destroy(copy);
|
|
|
566 PathData result = new PathData();
|
|
|
567 result.types = types;
|
|
|
568 result.points = pts;
|
|
|
569 return result;
|
|
|
570 }
|
|
|
571
|
|
|
572 /**
|
|
|
573 * Adds to the receiver a line from the current point to
|
|
|
574 * the point specified by (x, y).
|
|
|
575 *
|
|
|
576 * @param x the x coordinate of the end of the line to add
|
|
|
577 * @param y the y coordinate of the end of the line to add
|
|
|
578 *
|
|
|
579 * @exception SWTException <ul>
|
|
|
580 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
581 * </ul>
|
|
|
582 */
|
|
|
583 public void lineTo(float x, float y) {
|
|
|
584 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
585 if (!moved) {
|
|
|
586 double currentX, currentY;
|
|
|
587 Cairo.cairo_get_current_point(handle, ¤tX, ¤tY);
|
|
|
588 Cairo.cairo_move_to(handle, currentX, currentY);
|
|
|
589 moved = true;
|
|
|
590 }
|
|
|
591 Cairo.cairo_line_to(handle, x, y);
|
|
|
592 closed = false;
|
|
|
593 }
|
|
|
594
|
|
|
595 /**
|
|
|
596 * Sets the current point of the receiver to the point
|
|
|
597 * specified by (x, y). Note that this starts a new
|
|
|
598 * sub path.
|
|
|
599 *
|
|
|
600 * @param x the x coordinate of the new end point
|
|
|
601 * @param y the y coordinate of the new end point
|
|
|
602 *
|
|
|
603 * @exception SWTException <ul>
|
|
|
604 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
605 * </ul>
|
|
|
606 */
|
|
|
607 public void moveTo(float x, float y) {
|
|
|
608 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
609 /*
|
|
|
610 * Bug in Cairo. If cairo_move_to() is not called at the
|
|
|
611 * begining of a subpath, the first cairo_line_to() or
|
|
|
612 * cairo_curve_to() segment do not output anything. The fix
|
|
|
613 * is to detect that the app did not call cairo_move_to()
|
|
|
614 * before those calls and call it explicitly.
|
|
|
615 */
|
|
|
616 moved = true;
|
|
|
617 Cairo.cairo_move_to(handle, x, y);
|
|
|
618 closed = true;
|
|
|
619 }
|
|
|
620
|
|
|
621 /**
|
|
|
622 * Adds to the receiver a quadratic curve based on the parameters.
|
|
|
623 *
|
|
|
624 * @param cx the x coordinate of the control point of the spline
|
|
|
625 * @param cy the y coordinate of the control point of the spline
|
|
|
626 * @param x the x coordinate of the end point of the spline
|
|
|
627 * @param y the y coordinate of the end point of the spline
|
|
|
628 *
|
|
|
629 * @exception SWTException <ul>
|
|
|
630 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
|
|
|
631 * </ul>
|
|
|
632 */
|
|
|
633 public void quadTo(float cx, float cy, float x, float y) {
|
|
|
634 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
|
|
|
635 double currentX, currentY;
|
|
|
636 Cairo.cairo_get_current_point(handle, ¤tX, ¤tY);
|
|
|
637 if (!moved) {
|
|
|
638 Cairo.cairo_move_to(handle, currentX, currentY);
|
|
|
639 moved = true;
|
|
|
640 }
|
|
|
641 float x0 = cast(float)currentX;
|
|
|
642 float y0 = cast(float)currentY;
|
|
|
643 float cx1 = x0 + 2 * (cx - x0) / 3;
|
|
|
644 float cy1 = y0 + 2 * (cy - y0) / 3;
|
|
|
645 float cx2 = cx1 + (x - x0) / 3;
|
|
|
646 float cy2 = cy1 + (y - y0) / 3;
|
|
|
647 Cairo.cairo_curve_to(handle, cx1, cy1, cx2, cy2, x, y);
|
|
|
648 closed = false;
|
|
|
649 }
|
|
|
650
|
|
|
651 void destroy() {
|
|
|
652 Cairo.cairo_destroy(handle);
|
|
|
653 handle = null;
|
|
|
654 }
|
|
|
655
|
|
|
656 void init_(PathData data) {
|
|
|
657 byte[] types = data.types;
|
|
|
658 float[] points = data.points;
|
|
|
659 for (int i = 0, j = 0; i < types.length; i++) {
|
|
|
660 switch (types[i]) {
|
|
|
661 case SWT.PATH_MOVE_TO:
|
|
|
662 moveTo(points[j++], points[j++]);
|
|
|
663 break;
|
|
|
664 case SWT.PATH_LINE_TO:
|
|
|
665 lineTo(points[j++], points[j++]);
|
|
|
666 break;
|
|
|
667 case SWT.PATH_CUBIC_TO:
|
|
|
668 cubicTo(points[j++], points[j++], points[j++], points[j++], points[j++], points[j++]);
|
|
|
669 break;
|
|
|
670 case SWT.PATH_QUAD_TO:
|
|
|
671 quadTo(points[j++], points[j++], points[j++], points[j++]);
|
|
|
672 break;
|
|
|
673 case SWT.PATH_CLOSE:
|
|
|
674 close();
|
|
|
675 break;
|
|
|
676 default:
|
|
|
677 dispose();
|
|
|
678 SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
679 }
|
|
|
680 }
|
|
|
681 }
|
|
|
682
|
|
|
683 /**
|
|
|
684 * Returns <code>true</code> if the Path has been disposed,
|
|
|
685 * and <code>false</code> otherwise.
|
|
|
686 * <p>
|
|
|
687 * This method gets the dispose state for the Path.
|
|
|
688 * When a Path has been disposed, it is an error to
|
|
|
689 * invoke any other method using the Path.
|
|
|
690 *
|
|
|
691 * @return <code>true</code> when the Path is disposed, and <code>false</code> otherwise
|
|
|
692 */
|
|
|
693 public override bool isDisposed() {
|
|
|
694 return handle is null;
|
|
|
695 }
|
|
|
696
|
|
|
697 /**
|
|
|
698 * Returns a string containing a concise, human-readable
|
|
|
699 * description of the receiver.
|
|
|
700 *
|
|
|
701 * @return a string representation of the receiver
|
|
|
702 */
|
|
|
703 public override String toString() {
|
|
|
704 if (isDisposed()) return "Path {*DISPOSED*}";
|
|
|
705 return Format( "Path {{{}}", handle );
|
|
|
706 }
|
|
|
707
|
|
|
708 }
|
