Mercurial > projects > doodle
annotate canvas.d @ 9:66b47e122b31
Checkpoint
| author | "David Bryant <bagnose@gmail.com>" |
|---|---|
| date | Sat, 11 Jul 2009 22:06:09 +0930 |
| parents | 936feb16eed4 |
| children | 71ca82e0eb76 |
| rev | line source |
|---|---|
| 0 | 1 module canvas; |
| 2 | |
| 3 import std.stdio; | |
| 4 import std.math; | |
| 5 | |
| 6 import cairo.Context; | |
| 7 import cairo.Surface; | |
| 8 | |
| 9 import gdk.Drawable; | |
| 10 | |
| 11 import gtk.Widget; | |
| 12 import gtk.Toolbar; | |
| 13 import gtk.Table; | |
| 14 import gtk.HRuler; | |
| 15 import gtk.VRuler; | |
| 16 import gtk.Range; | |
| 17 import gtk.HScrollbar; | |
| 18 import gtk.VScrollbar; | |
| 19 import gtk.DrawingArea; | |
| 20 import gtk.Adjustment; | |
| 21 | |
| 22 import tk.misc; | |
|
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23 import tk.geometry; |
| 0 | 24 import tk.types; |
| 25 import tk.events; | |
| 26 import tk.gtk_support; | |
| 27 | |
| 28 private import gtkc.gtk; | |
| 29 | |
| 30 import icanvas; | |
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31 import cairo_support; |
| 0 | 32 |
| 33 // x and y run right and up respectively | |
| 34 | |
| 35 class Canvas : Table, ICanvas { | |
| 36 static this() { | |
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37 ORIGIN = Point(0.0, 0.0); |
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38 INITIAL_PAGE_SIZE = Vector(210.0, 297.0); // A4 |
| 0 | 39 } |
| 40 | |
| 41 this(ICanvasEventHandler event_handler) { | |
| 42 super(3, 3, 0); | |
| 43 | |
| 44 mEventHandler = event_handler; | |
| 45 | |
| 46 const double PPI = 120.0; | |
| 47 const double MM_PER_INCH = 25.4; | |
| 48 mZoom = 0.25 * PPI / MM_PER_INCH; | |
| 49 | |
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50 mPageLeftBottom = ORIGIN; |
| 0 | 51 mPageRightTop = ORIGIN + INITIAL_PAGE_SIZE; |
| 52 mViewCentre = ORIGIN + INITIAL_PAGE_SIZE / 2.0; | |
| 53 | |
| 54 mCanvasLeftBottom = mPageLeftBottom - 3.0 * INITIAL_PAGE_SIZE; | |
| 55 mCanvasRightTop = mPageRightTop + 3.0 * INITIAL_PAGE_SIZE; | |
| 56 | |
| 57 mHRuler = new HRuler(); | |
| 58 attach(mHRuler, | |
| 59 1, 2, | |
| 60 0, 1, | |
| 61 AttachOptions.FILL | AttachOptions.EXPAND, AttachOptions.SHRINK, | |
| 62 0, 0); | |
| 63 mHRuler.setMetric(GtkMetricType.CENTIMETERS); | |
| 64 | |
| 65 mVRuler = new VRuler(); | |
| 66 attach(mVRuler, | |
| 67 0, 1, | |
| 68 1, 2, | |
| 69 AttachOptions.SHRINK, AttachOptions.FILL | AttachOptions.EXPAND, | |
| 70 0, 0); | |
| 71 mVRuler.setMetric(GtkMetricType.CENTIMETERS); | |
| 72 | |
| 73 mDrawingArea = new DrawingArea(); | |
| 74 mDrawingArea.addOnRealize(&onRealize); | |
| 75 mDrawingArea.addOnConfigure(&onConfigure); | |
| 76 mDrawingArea.addOnExpose(&onExpose); | |
| 5 | 77 mDrawingArea.addOnButtonPress(&onButtonPress); |
| 78 mDrawingArea.addOnButtonRelease(&onButtonRelease); | |
| 0 | 79 mDrawingArea.addOnKeyPress(&onKeyEvent); |
| 80 mDrawingArea.addOnKeyRelease(&onKeyEvent); | |
| 81 mDrawingArea.addOnMotionNotify(&onMotionNotify); | |
| 82 mDrawingArea.addOnScroll(&onScroll); | |
| 83 attach(mDrawingArea, | |
| 84 1, 2, | |
| 85 1, 2, | |
| 86 AttachOptions.FILL | AttachOptions.EXPAND, AttachOptions.FILL | AttachOptions.EXPAND, | |
| 87 0, 0); | |
| 88 | |
| 89 // value, lower, upper, step-inc, page-inc, page-size | |
| 90 // Give the adjustments dummy values until we receive a configure | |
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91 mHAdjustment = new Adjustment(0.25, 0.0, 1.0, 0.2, 0.5, 0.5); |
| 0 | 92 mHAdjustment.addOnValueChanged(&onValueChanged); |
| 93 mHScrollbar = new HScrollbar(mHAdjustment); | |
| 94 attach(mHScrollbar, | |
| 95 1, 2, | |
| 96 2, 3, | |
| 97 AttachOptions.FILL | AttachOptions.EXPAND, AttachOptions.SHRINK, | |
| 98 0, 0); | |
| 99 | |
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100 mVAdjustment = new Adjustment(0.0, 0.0, 1.0, 0.2, 0.5, 0.5); |
| 0 | 101 mVAdjustment.addOnValueChanged(&onValueChanged); |
| 102 mVScrollbar = new VScrollbar(mVAdjustment); | |
| 103 attach(mVScrollbar, | |
| 104 2, 3, | |
| 105 1, 2, | |
| 106 AttachOptions.SHRINK, | |
| 107 AttachOptions.FILL | AttachOptions.EXPAND, | |
| 108 0, 0); | |
| 109 } | |
| 110 | |
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111 override void rel_zoom(Point screen_datum, double factor) { |
| 0 | 112 // Work out pixel distance from current centre to datum, |
| 113 // Do the zoom, then work out the new centre that keeps the | |
| 114 // pixel distance the same | |
| 115 | |
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116 Point old_model_datum = screen_to_model(screen_datum); |
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117 Vector pixel_distance = model_to_screen(old_model_datum - mViewCentre); |
| 0 | 118 mZoom = clamp_zoom(factor * mZoom); |
| 119 mViewCentre = old_model_datum - screen_to_model(pixel_distance); | |
| 120 | |
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121 Point new_model_datum = screen_to_model(screen_datum); |
| 0 | 122 |
| 123 update_adjustments(); | |
| 124 //update_rulers(new_model_datum); | |
| 125 update_rulers(); | |
| 126 queueDraw(); | |
| 127 } | |
| 128 | |
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129 override void rel_pan(Vector screen_displacement) { |
| 0 | 130 mViewCentre = mViewCentre + screen_to_model(screen_displacement); |
| 131 | |
| 132 update_adjustments(); | |
| 133 update_rulers(); | |
| 134 queueDraw(); | |
| 135 } | |
| 136 | |
| 137 private { | |
| 138 | |
| 139 void onRealize(Widget widget) { | |
| 140 assert(widget is mDrawingArea); | |
| 141 //writefln("Got realize\n"); | |
| 142 } | |
| 143 | |
| 144 bool onConfigure(GdkEventConfigure * event, Widget widget) { | |
| 145 assert(widget is mDrawingArea); | |
| 146 | |
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147 mViewSize = Vector(cast(double)event.width, cast(double)event.height); |
| 0 | 148 update_adjustments(); |
| 149 update_rulers(); | |
| 150 | |
| 151 | |
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152 return true; |
| 0 | 153 } |
| 154 | |
| 155 bool onExpose(GdkEventExpose * event, Widget widget) { | |
| 156 assert(widget is mDrawingArea); | |
| 157 | |
| 158 Drawable dr = mDrawingArea.getWindow(); | |
| 159 | |
| 160 int width, height; | |
| 161 dr.getSize(width, height); | |
| 162 //writefln("Got expose %dx%d\n", width, height); | |
| 163 | |
| 5 | 164 scope cr = new Context(dr); |
| 0 | 165 |
| 166 if (event) { | |
| 167 cr.rectangle(event.area.x, event.area.y, event.area.width, event.area.height); | |
| 168 cr.clip(); | |
| 169 } | |
| 170 | |
| 171 // Make the window light grey | |
| 172 cr.setSourceRgba(1.0, 1.0, 1.0, 0.7); | |
| 173 if (event) { | |
| 174 cr.rectangle(event.area.x, event.area.y, event.area.width, event.area.height); | |
| 175 } | |
| 176 else { | |
| 177 cr.rectangle(0.0, 0.0, width, height); | |
| 178 } | |
| 179 cr.fill(); | |
| 180 | |
| 181 { | |
| 182 // Make the paper white, with a border | |
| 183 | |
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184 Point screen_page_left_bottom = model_to_screen(mPageLeftBottom); |
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185 Point screen_page_right_top = model_to_screen(mPageRightTop); |
| 0 | 186 |
| 187 cr.setSourceRgba(1.0, 1.0, 1.0, 1.0); | |
| 188 rectangle(cr, screen_page_left_bottom, screen_page_right_top); | |
| 189 cr.fill(); | |
| 190 | |
| 191 cr.setSourceRgba(0.0, 0.0, 0.0, 1.0); | |
| 192 rectangle(cr, screen_page_left_bottom, screen_page_right_top); | |
| 193 cr.stroke(); | |
| 194 } | |
| 195 | |
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196 return true; |
| 0 | 197 } |
| 198 | |
| 5 | 199 bool onButtonPress(GdkEventButton * event, Widget widget) { |
| 0 | 200 assert(widget is mDrawingArea); |
| 201 //writefln("Got button event\n"); | |
| 202 | |
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203 Point screen_point = Point(event.x + 0.5, event.y + 0.5); |
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204 Point model_point = screen_to_model(screen_point); |
| 0 | 205 |
| 7 | 206 auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), |
| 207 gtk2tk_button_name(event.button), | |
| 0 | 208 screen_point, |
| 209 model_point, | |
| 210 gtk2tk_mask(event.state)); | |
| 211 | |
| 5 | 212 mEventHandler.handle_button_press(this, button_event); |
| 213 | |
| 214 return true; | |
| 215 } | |
| 216 | |
| 217 bool onButtonRelease(GdkEventButton * event, Widget widget) { | |
| 218 assert(widget is mDrawingArea); | |
| 219 //writefln("Got button event\n"); | |
| 220 | |
| 221 Point screen_point = Point(event.x + 0.5, event.y + 0.5); | |
| 222 Point model_point = screen_to_model(screen_point); | |
| 223 | |
| 7 | 224 auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), |
| 225 gtk2tk_button_name(event.button), | |
| 5 | 226 screen_point, |
| 227 model_point, | |
| 228 gtk2tk_mask(event.state)); | |
| 229 | |
| 230 mEventHandler.handle_button_release(this, button_event); | |
| 0 | 231 |
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232 return true; |
| 0 | 233 } |
| 234 | |
| 235 bool onKeyEvent(GdkEventKey * event, Widget widget) { | |
| 236 assert(widget is mDrawingArea); | |
| 237 //writefln("Got key event\n"); | |
| 238 | |
| 239 //auto key_event = new KeyEvent("", | |
| 240 // mEventHandle.handle_key(key_event); | |
| 241 | |
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242 return true; |
| 0 | 243 } |
| 244 | |
| 245 bool onMotionNotify(GdkEventMotion * event, Widget widget) { | |
| 246 assert(widget is mDrawingArea); | |
| 247 //writefln("Got motion notify\n"); | |
| 248 gtk_widget_event(mHRuler.getWidgetStruct(), cast(GdkEvent *)event); | |
| 249 gtk_widget_event(mVRuler.getWidgetStruct(), cast(GdkEvent *)event); | |
| 250 | |
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251 Point screen_point = Point(event.x + 0.5, event.y + 0.5); |
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252 Point model_point = screen_to_model(screen_point); |
| 0 | 253 |
| 254 auto motion_event = new MotionEvent(screen_point, | |
| 255 model_point, | |
| 256 gtk2tk_mask(event.state)); | |
| 257 | |
| 258 mEventHandler.handle_motion(this, motion_event); | |
| 259 | |
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260 return true; |
| 0 | 261 } |
| 262 | |
| 263 bool onScroll(GdkEventScroll * event, Widget widget) { | |
| 264 assert(widget is mDrawingArea); | |
| 265 //writefln("Got scroll\n"); | |
| 266 | |
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267 Point screen_point = Point(event.x + 0.5, event.y + 0.5); |
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268 Point model_point = screen_to_model(screen_point); |
| 0 | 269 |
| 270 auto scroll_event = new ScrollEvent(gtk2tk_direction(event.direction), | |
| 271 screen_point, | |
| 272 model_point, | |
| 273 gtk2tk_mask(event.state)); | |
| 274 | |
| 275 mEventHandler.handle_scroll(this, scroll_event); | |
| 276 | |
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277 return true; |
| 0 | 278 } |
| 279 | |
| 280 void onValueChanged(Adjustment adjustment) { | |
| 281 GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct(); | |
| 282 GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct(); | |
| 283 | |
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284 Point view_left_bottom = Point(gtk_adjustment_get_value(h_gtkAdjustment), |
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285 gtk_adjustment_get_value(v_gtkAdjustment)); |
| 9 | 286 //writefln("%s", view_left_bottom); |
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287 Vector model_size = screen_to_model(mViewSize); |
| 0 | 288 mViewCentre = view_left_bottom + model_size / 2.0; |
| 289 | |
| 290 update_rulers(); | |
| 291 | |
| 292 queueDraw(); | |
| 293 } | |
| 294 | |
| 295 void update_rulers() { | |
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296 Vector model_size = screen_to_model(mViewSize); |
| 0 | 297 |
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298 Point view_left_bottom = mViewCentre - model_size / 2.0; |
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299 Point view_right_top = mViewCentre + model_size / 2.0; |
| 0 | 300 |
| 301 mHRuler.setRange(view_left_bottom.x, | |
| 302 view_right_top.x, | |
| 303 0.0, // TODO preserve the value | |
| 304 mZoom * 2000.0); | |
| 305 mVRuler.setRange(view_right_top.y, | |
| 306 view_left_bottom.y, | |
| 307 0.0, | |
| 308 mZoom * 2000.0); | |
| 309 } | |
| 310 | |
| 311 void update_adjustments() { | |
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312 Vector model_size = screen_to_model(mViewSize); |
| 0 | 313 |
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314 Point view_left_bottom = mViewCentre - model_size / 2.0; |
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315 Point view_right_top = mViewCentre + model_size / 2.0; |
| 0 | 316 |
| 317 // Adjust the canvas size if necessary | |
| 318 mCanvasLeftBottom = min_extents(mCanvasLeftBottom, view_left_bottom); | |
| 319 mCanvasRightTop = max_extents(mCanvasRightTop, view_right_top); | |
| 320 | |
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321 Vector canvas_size = mCanvasRightTop - mCanvasLeftBottom; |
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322 Vector page_size = mPageRightTop - mPageLeftBottom; |
| 0 | 323 |
| 324 // Update the adjustments | |
| 325 | |
| 326 GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct(); | |
| 327 GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct(); | |
| 328 | |
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329 gtk_adjustment_set_lower(h_gtkAdjustment, mCanvasLeftBottom.x); |
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330 gtk_adjustment_set_upper(h_gtkAdjustment, mCanvasRightTop.x); |
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331 gtk_adjustment_set_value(h_gtkAdjustment, view_left_bottom.x); |
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332 gtk_adjustment_set_step_increment(h_gtkAdjustment, canvas_size.x / 10.0); |
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333 gtk_adjustment_set_page_increment(h_gtkAdjustment, canvas_size.x / 5.0); |
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334 gtk_adjustment_set_page_size(h_gtkAdjustment, model_size.x); |
| 0 | 335 |
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336 gtk_adjustment_set_lower(v_gtkAdjustment, mCanvasLeftBottom.y); |
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337 gtk_adjustment_set_upper(v_gtkAdjustment, mCanvasRightTop.y); |
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338 gtk_adjustment_set_value(v_gtkAdjustment, view_left_bottom.y); |
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339 gtk_adjustment_set_step_increment(v_gtkAdjustment, canvas_size.y / 10.0); |
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340 gtk_adjustment_set_page_increment(v_gtkAdjustment, canvas_size.y / 5.0); |
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341 gtk_adjustment_set_page_size(v_gtkAdjustment, model_size.y); |
| 0 | 342 |
| 343 mHAdjustment.changed(); | |
| 344 mHAdjustment.valueChanged(); | |
| 345 mVAdjustment.changed(); | |
| 346 mVAdjustment.valueChanged(); | |
| 347 } | |
| 348 | |
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349 Point model_to_screen(Point model) { return ORIGIN + mViewSize / 2.0 + mZoom * (model - mViewCentre); } |
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350 Point screen_to_model(Point screen) { return mViewCentre + (screen - mViewSize / 2.0 - ORIGIN) / mZoom; } |
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351 Vector model_to_screen(Vector model) { return mZoom * model; } |
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352 Vector screen_to_model(Vector screen) { return screen / mZoom; } |
| 0 | 353 double model_to_screen(double model) { return mZoom * model; } |
| 354 double screen_to_model(double screen) { return screen / mZoom; } | |
| 355 | |
| 9 | 356 double clamp_zoom(double zoom) { return clamp(zoom, 0.02, 50.0); } |
| 0 | 357 |
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358 static const Point ORIGIN; |
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359 static const Vector INITIAL_PAGE_SIZE; |
| 0 | 360 |
| 361 ICanvasEventHandler mEventHandler; | |
| 362 | |
| 363 // Model units are in millimetres | |
| 364 // Screen units are in pixels | |
| 365 | |
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366 double mZoom; // pixels-per-mm |
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367 Point mViewCentre; // model: where in the model is the centre of our view |
| 0 | 368 |
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369 Point mCanvasLeftBottom; // model: bottom left corner of canvas |
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370 Point mCanvasRightTop; // model: top right corner of canvas |
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371 Point mPageLeftBottom; // model: bottom left corner of page |
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372 Point mPageRightTop; // model: top right corner of page |
| 0 | 373 |
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374 Vector mViewSize; // screen: size of view window in pixels |
| 0 | 375 |
| 376 HRuler mHRuler; | |
| 377 VRuler mVRuler; | |
| 378 DrawingArea mDrawingArea; | |
| 379 Adjustment mHAdjustment; | |
| 380 HScrollbar mHScrollbar; | |
| 381 Adjustment mVAdjustment; | |
| 382 VScrollbar mVScrollbar; | |
| 383 } | |
| 384 } |