Mercurial > projects > doodle
annotate canvas.d @ 10:71ca82e0eb76
Checkpoint
| author | "David Bryant <bagnose@gmail.com>" |
|---|---|
| date | Sat, 11 Jul 2009 22:49:41 +0930 |
| parents | 66b47e122b31 |
| children | fb571a3b1f0d |
| 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 | |
| 10 | 35 class Canvas : Table, Viewport { |
| 0 | 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 | |
| 10 | 41 this(EventHandler event_handler) { |
| 0 | 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 | |
| 10 | 137 override Point model_to_screen(Point model) const { return ORIGIN + mViewSize / 2.0 + mZoom * (model - mViewCentre); } |
| 138 override Point screen_to_model(Point screen) const { return mViewCentre + (screen - mViewSize / 2.0 - ORIGIN) / mZoom; } | |
| 139 override Vector model_to_screen(Vector model) const { return mZoom * model; } | |
| 140 override Vector screen_to_model(Vector screen) const { return screen / mZoom; } | |
| 141 override double model_to_screen(double model) const { return mZoom * model; } | |
| 142 override double screen_to_model(double screen) const { return screen / mZoom; } | |
| 143 | |
| 0 | 144 private { |
| 145 | |
| 146 void onRealize(Widget widget) { | |
| 147 assert(widget is mDrawingArea); | |
| 148 //writefln("Got realize\n"); | |
| 149 } | |
| 150 | |
| 151 bool onConfigure(GdkEventConfigure * event, Widget widget) { | |
| 152 assert(widget is mDrawingArea); | |
| 153 | |
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154 mViewSize = Vector(cast(double)event.width, cast(double)event.height); |
| 0 | 155 update_adjustments(); |
| 156 update_rulers(); | |
| 157 | |
| 158 | |
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159 return true; |
| 0 | 160 } |
| 161 | |
| 162 bool onExpose(GdkEventExpose * event, Widget widget) { | |
| 163 assert(widget is mDrawingArea); | |
| 164 | |
| 165 Drawable dr = mDrawingArea.getWindow(); | |
| 166 | |
| 167 int width, height; | |
| 168 dr.getSize(width, height); | |
| 169 //writefln("Got expose %dx%d\n", width, height); | |
| 170 | |
| 5 | 171 scope cr = new Context(dr); |
| 0 | 172 |
| 173 if (event) { | |
| 174 cr.rectangle(event.area.x, event.area.y, event.area.width, event.area.height); | |
| 175 cr.clip(); | |
| 176 } | |
| 177 | |
| 178 // Make the window light grey | |
| 179 cr.setSourceRgba(1.0, 1.0, 1.0, 0.7); | |
| 180 if (event) { | |
| 181 cr.rectangle(event.area.x, event.area.y, event.area.width, event.area.height); | |
| 182 } | |
| 183 else { | |
| 184 cr.rectangle(0.0, 0.0, width, height); | |
| 185 } | |
| 186 cr.fill(); | |
| 187 | |
| 188 { | |
| 189 // Make the paper white, with a border | |
| 190 | |
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191 Point screen_page_left_bottom = model_to_screen(mPageLeftBottom); |
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192 Point screen_page_right_top = model_to_screen(mPageRightTop); |
| 0 | 193 |
| 194 cr.setSourceRgba(1.0, 1.0, 1.0, 1.0); | |
| 10 | 195 draw_rectangle(cr, Rectangle(screen_page_left_bottom, screen_page_right_top)); |
| 0 | 196 cr.fill(); |
| 197 | |
| 198 cr.setSourceRgba(0.0, 0.0, 0.0, 1.0); | |
| 10 | 199 draw_rectangle(cr, Rectangle(screen_page_left_bottom, screen_page_right_top)); |
| 0 | 200 cr.stroke(); |
| 201 } | |
| 202 | |
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203 return true; |
| 0 | 204 } |
| 205 | |
| 5 | 206 bool onButtonPress(GdkEventButton * event, Widget widget) { |
| 0 | 207 assert(widget is mDrawingArea); |
| 208 //writefln("Got button event\n"); | |
| 209 | |
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210 Point screen_point = Point(event.x + 0.5, event.y + 0.5); |
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211 Point model_point = screen_to_model(screen_point); |
| 0 | 212 |
| 7 | 213 auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), |
| 214 gtk2tk_button_name(event.button), | |
| 0 | 215 screen_point, |
| 216 model_point, | |
| 217 gtk2tk_mask(event.state)); | |
| 218 | |
| 5 | 219 mEventHandler.handle_button_press(this, button_event); |
| 220 | |
| 221 return true; | |
| 222 } | |
| 223 | |
| 224 bool onButtonRelease(GdkEventButton * event, Widget widget) { | |
| 225 assert(widget is mDrawingArea); | |
| 226 //writefln("Got button event\n"); | |
| 227 | |
| 228 Point screen_point = Point(event.x + 0.5, event.y + 0.5); | |
| 229 Point model_point = screen_to_model(screen_point); | |
| 230 | |
| 7 | 231 auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), |
| 232 gtk2tk_button_name(event.button), | |
| 5 | 233 screen_point, |
| 234 model_point, | |
| 235 gtk2tk_mask(event.state)); | |
| 236 | |
| 237 mEventHandler.handle_button_release(this, button_event); | |
| 0 | 238 |
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239 return true; |
| 0 | 240 } |
| 241 | |
| 242 bool onKeyEvent(GdkEventKey * event, Widget widget) { | |
| 243 assert(widget is mDrawingArea); | |
| 244 //writefln("Got key event\n"); | |
| 245 | |
| 246 //auto key_event = new KeyEvent("", | |
| 247 // mEventHandle.handle_key(key_event); | |
| 248 | |
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249 return true; |
| 0 | 250 } |
| 251 | |
| 252 bool onMotionNotify(GdkEventMotion * event, Widget widget) { | |
| 253 assert(widget is mDrawingArea); | |
| 254 //writefln("Got motion notify\n"); | |
| 255 gtk_widget_event(mHRuler.getWidgetStruct(), cast(GdkEvent *)event); | |
| 256 gtk_widget_event(mVRuler.getWidgetStruct(), cast(GdkEvent *)event); | |
| 257 | |
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258 Point screen_point = Point(event.x + 0.5, event.y + 0.5); |
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259 Point model_point = screen_to_model(screen_point); |
| 0 | 260 |
| 261 auto motion_event = new MotionEvent(screen_point, | |
| 262 model_point, | |
| 263 gtk2tk_mask(event.state)); | |
| 264 | |
| 265 mEventHandler.handle_motion(this, motion_event); | |
| 266 | |
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267 return true; |
| 0 | 268 } |
| 269 | |
| 270 bool onScroll(GdkEventScroll * event, Widget widget) { | |
| 271 assert(widget is mDrawingArea); | |
| 272 //writefln("Got scroll\n"); | |
| 273 | |
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274 Point screen_point = Point(event.x + 0.5, event.y + 0.5); |
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275 Point model_point = screen_to_model(screen_point); |
| 0 | 276 |
| 277 auto scroll_event = new ScrollEvent(gtk2tk_direction(event.direction), | |
| 278 screen_point, | |
| 279 model_point, | |
| 280 gtk2tk_mask(event.state)); | |
| 281 | |
| 282 mEventHandler.handle_scroll(this, scroll_event); | |
| 283 | |
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284 return true; |
| 0 | 285 } |
| 286 | |
| 287 void onValueChanged(Adjustment adjustment) { | |
| 288 GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct(); | |
| 289 GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct(); | |
| 290 | |
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291 Point view_left_bottom = Point(gtk_adjustment_get_value(h_gtkAdjustment), |
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292 gtk_adjustment_get_value(v_gtkAdjustment)); |
| 9 | 293 //writefln("%s", view_left_bottom); |
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294 Vector model_size = screen_to_model(mViewSize); |
| 0 | 295 mViewCentre = view_left_bottom + model_size / 2.0; |
| 296 | |
| 297 update_rulers(); | |
| 298 | |
| 299 queueDraw(); | |
| 300 } | |
| 301 | |
| 302 void update_rulers() { | |
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303 Vector model_size = screen_to_model(mViewSize); |
| 0 | 304 |
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305 Point view_left_bottom = mViewCentre - model_size / 2.0; |
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306 Point view_right_top = mViewCentre + model_size / 2.0; |
| 0 | 307 |
| 308 mHRuler.setRange(view_left_bottom.x, | |
| 309 view_right_top.x, | |
| 310 0.0, // TODO preserve the value | |
| 311 mZoom * 2000.0); | |
| 312 mVRuler.setRange(view_right_top.y, | |
| 313 view_left_bottom.y, | |
| 314 0.0, | |
| 315 mZoom * 2000.0); | |
| 316 } | |
| 317 | |
| 318 void update_adjustments() { | |
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319 Vector model_size = screen_to_model(mViewSize); |
| 0 | 320 |
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321 Point view_left_bottom = mViewCentre - model_size / 2.0; |
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322 Point view_right_top = mViewCentre + model_size / 2.0; |
| 0 | 323 |
| 324 // Adjust the canvas size if necessary | |
| 325 mCanvasLeftBottom = min_extents(mCanvasLeftBottom, view_left_bottom); | |
| 326 mCanvasRightTop = max_extents(mCanvasRightTop, view_right_top); | |
| 327 | |
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328 Vector canvas_size = mCanvasRightTop - mCanvasLeftBottom; |
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329 Vector page_size = mPageRightTop - mPageLeftBottom; |
| 0 | 330 |
| 331 // Update the adjustments | |
| 332 | |
| 333 GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct(); | |
| 334 GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct(); | |
| 335 | |
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336 gtk_adjustment_set_lower(h_gtkAdjustment, mCanvasLeftBottom.x); |
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337 gtk_adjustment_set_upper(h_gtkAdjustment, mCanvasRightTop.x); |
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338 gtk_adjustment_set_value(h_gtkAdjustment, view_left_bottom.x); |
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339 gtk_adjustment_set_step_increment(h_gtkAdjustment, canvas_size.x / 10.0); |
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340 gtk_adjustment_set_page_increment(h_gtkAdjustment, canvas_size.x / 5.0); |
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341 gtk_adjustment_set_page_size(h_gtkAdjustment, model_size.x); |
| 0 | 342 |
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343 gtk_adjustment_set_lower(v_gtkAdjustment, mCanvasLeftBottom.y); |
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344 gtk_adjustment_set_upper(v_gtkAdjustment, mCanvasRightTop.y); |
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345 gtk_adjustment_set_value(v_gtkAdjustment, view_left_bottom.y); |
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346 gtk_adjustment_set_step_increment(v_gtkAdjustment, canvas_size.y / 10.0); |
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347 gtk_adjustment_set_page_increment(v_gtkAdjustment, canvas_size.y / 5.0); |
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* Switched over to geometry done with structs instead of classes.
David Bryant <daveb@acres.com.au>
parents:
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changeset
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348 gtk_adjustment_set_page_size(v_gtkAdjustment, model_size.y); |
| 0 | 349 |
| 350 mHAdjustment.changed(); | |
| 351 mHAdjustment.valueChanged(); | |
| 352 mVAdjustment.changed(); | |
| 353 mVAdjustment.valueChanged(); | |
| 354 } | |
| 355 | |
| 9 | 356 double clamp_zoom(double zoom) { return clamp(zoom, 0.02, 50.0); } |
| 0 | 357 |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
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358 static const Point ORIGIN; |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
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changeset
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359 static const Vector INITIAL_PAGE_SIZE; |
| 0 | 360 |
| 10 | 361 EventHandler mEventHandler; |
| 0 | 362 |
| 363 // Model units are in millimetres | |
| 364 // Screen units are in pixels | |
| 365 | |
| 10 | 366 double mZoom; // pixels-per-mm |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
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changeset
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367 Point mViewCentre; // model: where in the model is the centre of our view |
| 0 | 368 |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
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369 Point mCanvasLeftBottom; // model: bottom left corner of canvas |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
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changeset
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370 Point mCanvasRightTop; // model: top right corner of canvas |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
2
diff
changeset
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371 Point mPageLeftBottom; // model: bottom left corner of page |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
2
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changeset
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372 Point mPageRightTop; // model: top right corner of page |
| 0 | 373 |
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7d57cae10805
Renamed geometry2 to geometry
David Bryant <daveb@acres.com.au>
parents:
2
diff
changeset
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374 Vector mViewSize; // screen: size of view window in pixels |
| 0 | 375 |
| 10 | 376 // Child widgets: |
| 0 | 377 HRuler mHRuler; |
| 378 VRuler mVRuler; | |
| 379 DrawingArea mDrawingArea; | |
| 380 Adjustment mHAdjustment; | |
| 381 HScrollbar mHScrollbar; | |
| 382 Adjustment mVAdjustment; | |
| 383 VScrollbar mVScrollbar; | |
| 384 } | |
| 385 } |