Mercurial > projects > doodle
view canvas.d @ 13:f0ade1b49fe7
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author | "David Bryant <bagnose@gmail.com>" |
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date | Sun, 12 Jul 2009 01:04:35 +0930 |
parents | a093c4fbdd43 |
children | 0b7e7d43a79d |
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module canvas; import std.stdio; import std.math; import cairo.Context; import cairo.Surface; import gdk.Drawable; import gtk.Widget; import gtk.Toolbar; import gtk.Table; import gtk.HRuler; import gtk.VRuler; import gtk.Range; import gtk.HScrollbar; import gtk.VScrollbar; import gtk.DrawingArea; import gtk.Adjustment; import tk.misc; import tk.geometry; import tk.types; import tk.events; import tk.gtk_support; private import gtkc.gtk; import icanvas; import cairo_support; // x and y run right and up respectively class Canvas : Table, Viewport { this(in Layer[] layers, EventHandler event_handler, in double ppi) { super(3, 3, 0); mLayers = layers.dup; mEventHandler = event_handler; mPPI = ppi; const double MM_PER_INCH = 25.4; mZoom = 0.25 * mPPI / MM_PER_INCH; // Take the union of the bounds of each layer to // determine the canvas size Rectangle total_layer_bounds; foreach (ref layer; mLayers) { total_layer_bounds = total_layer_bounds | layer.bounds; } assert(total_layer_bounds.valid); mCanvasLeftBottom = total_layer_bounds.min_corner - total_layer_bounds.size; mCanvasRightTop = total_layer_bounds.max_corner + total_layer_bounds.size; mViewCentre = mCanvasLeftBottom + (mCanvasRightTop - mCanvasLeftBottom) / 2.0; // Create our child widgets and register callbacks mHRuler = new HRuler; attach(mHRuler, 1, 2, 0, 1, AttachOptions.FILL | AttachOptions.EXPAND, AttachOptions.SHRINK, 0, 0); mHRuler.setMetric(GtkMetricType.CENTIMETERS); mVRuler = new VRuler; attach(mVRuler, 0, 1, 1, 2, AttachOptions.SHRINK, AttachOptions.FILL | AttachOptions.EXPAND, 0, 0); mVRuler.setMetric(GtkMetricType.CENTIMETERS); mDrawingArea = new DrawingArea; mDrawingArea.addOnRealize(&onRealize); mDrawingArea.addOnConfigure(&onConfigure); mDrawingArea.addOnExpose(&onExpose); mDrawingArea.addOnButtonPress(&onButtonPress); mDrawingArea.addOnButtonRelease(&onButtonRelease); mDrawingArea.addOnKeyPress(&onKeyEvent); mDrawingArea.addOnKeyRelease(&onKeyEvent); mDrawingArea.addOnMotionNotify(&onMotionNotify); mDrawingArea.addOnScroll(&onScroll); attach(mDrawingArea, 1, 2, 1, 2, AttachOptions.FILL | AttachOptions.EXPAND, AttachOptions.FILL | AttachOptions.EXPAND, 0, 0); // value, lower, upper, step-inc, page-inc, page-size // Give the adjustments dummy values until we receive a configure mHAdjustment = new Adjustment(0.0, 0.0, 1.0, 0.2, 0.5, 0.5); mHAdjustment.addOnValueChanged(&onValueChanged); mHScrollbar = new HScrollbar(mHAdjustment); attach(mHScrollbar, 1, 2, 2, 3, AttachOptions.FILL | AttachOptions.EXPAND, AttachOptions.SHRINK, 0, 0); mVAdjustment = new Adjustment(0.0, 0.0, 1.0, 0.2, 0.5, 0.5); mVAdjustment.addOnValueChanged(&onValueChanged); mVScrollbar = new VScrollbar(mVAdjustment); attach(mVScrollbar, 2, 3, 1, 2, AttachOptions.SHRINK, AttachOptions.FILL | AttachOptions.EXPAND, 0, 0); } override void rel_zoom(Point screen_datum, double factor) { // Work out pixel distance from current centre to datum, // Do the zoom, then work out the new centre that keeps the // pixel distance the same Point old_model_datum = screen_to_model(screen_datum); Vector pixel_distance = model_to_screen(old_model_datum - mViewCentre); mZoom = clamp_zoom(factor * mZoom); mViewCentre = old_model_datum - screen_to_model(pixel_distance); //Point new_model_datum = screen_to_model(screen_datum); update_adjustments; //update_rulers(new_model_datum); update_rulers; queueDraw; } override void rel_pan(Vector screen_displacement) { mViewCentre = mViewCentre + screen_to_model(screen_displacement); update_adjustments; update_rulers; queueDraw; } override double zoom() const { return mZoom; } override Point model_to_screen(Point model) const { return Point.DEFAULT + mViewSize / 2.0 + mZoom * (model - mViewCentre); } override Point screen_to_model(Point screen) const { return mViewCentre + (screen - mViewSize / 2.0 - Point.DEFAULT) / mZoom; } override Vector model_to_screen(Vector model) const { return mZoom * model; } override Vector screen_to_model(Vector screen) const { return screen / mZoom; } override double model_to_screen(double model) const { return mZoom * model; } override double screen_to_model(double screen) const { return screen / mZoom; } override Rectangle model_to_screen(Rectangle model) const { return Rectangle(model_to_screen(model.position), model_to_screen(model.size)); } override Rectangle screen_to_model(Rectangle model) const { return Rectangle(screen_to_model(model.position), screen_to_model(model.size)); } private { void onRealize(Widget widget) { assert(widget is mDrawingArea); //writefln("Got realize\n"); } bool onConfigure(GdkEventConfigure * event, Widget widget) { assert(widget is mDrawingArea); mViewSize = Vector(cast(double)event.width, cast(double)event.height); update_adjustments; update_rulers; return true; } bool onExpose(GdkEventExpose * event, Widget widget) { assert(widget is mDrawingArea); Drawable dr = mDrawingArea.getWindow; int width, height; dr.getSize(width, height); //writefln("Got expose %dx%d\n", width, height); scope model_cr = new Context(dr); scope screen_cr = new Context(dr); Rectangle damage = event is null ? Rectangle(Point(0.0, 0.0), Vector(cast(double)width, cast(double)height)) : Rectangle(Point(cast(double)event.area.x, cast(double)event.area.y), Vector(cast(double)event.area.width, cast(double)event.area.height)); model_cr.save; screen_cr.save; { // Setup model context rectangle(model_cr, damage); model_cr.clip; GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct(); GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct(); model_cr.translate(mCanvasLeftBottom.x - gtk_adjustment_get_value(h_gtkAdjustment), mCanvasLeftBottom.y - gtk_adjustment_get_value(v_gtkAdjustment)); model_cr.scale(mZoom, -mZoom); // Setup screen context screen_cr.translate(0.0, mViewSize.y); screen_cr.scale(1.0, -1.0); rectangle(screen_cr, damage); screen_cr.clip; // Fill the background screen_cr.save; { // Make the window light grey screen_cr.setSourceRgba(1.0, 1.0, 1.0, 0.7); rectangle(screen_cr, damage); screen_cr.fill; } screen_cr.restore; // Draw each layer foreach(ref layer; mLayers) { model_cr.save; screen_cr.save; { layer.draw(this, damage, model_cr, screen_cr); } screen_cr.restore; model_cr.restore; } } screen_cr.restore; model_cr.restore; return true; } bool onButtonPress(GdkEventButton * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got button event\n"); Point screen_point = Point(event.x + 0.5, event.y + 0.5); Point model_point = screen_to_model(screen_point); auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), gtk2tk_button_name(event.button), screen_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_button_press(this, button_event); return true; } bool onButtonRelease(GdkEventButton * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got button event\n"); Point screen_point = Point(event.x + 0.5, event.y + 0.5); Point model_point = screen_to_model(screen_point); auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), gtk2tk_button_name(event.button), screen_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_button_release(this, button_event); return true; } bool onKeyEvent(GdkEventKey * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got key event\n"); //auto key_event = new KeyEvent("", // mEventHandle.handle_key(key_event); return true; } bool onMotionNotify(GdkEventMotion * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got motion notify\n"); gtk_widget_event(mHRuler.getWidgetStruct(), cast(GdkEvent *)event); gtk_widget_event(mVRuler.getWidgetStruct(), cast(GdkEvent *)event); Point screen_point = Point(event.x + 0.5, event.y + 0.5); Point model_point = screen_to_model(screen_point); auto motion_event = new MotionEvent(screen_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_motion(this, motion_event); return true; } bool onScroll(GdkEventScroll * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got scroll\n"); Point screen_point = Point(event.x + 0.5, event.y + 0.5); Point model_point = screen_to_model(screen_point); auto scroll_event = new ScrollEvent(gtk2tk_direction(event.direction), screen_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_scroll(this, scroll_event); return true; } void onValueChanged(Adjustment adjustment) { GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct; GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct; Point view_left_bottom = Point(gtk_adjustment_get_value(h_gtkAdjustment), gtk_adjustment_get_value(v_gtkAdjustment)); //writefln("%s", view_left_bottom); Vector model_size = screen_to_model(mViewSize); mViewCentre = view_left_bottom + model_size / 2.0; update_rulers; queueDraw; } void update_rulers() { Vector model_size = screen_to_model(mViewSize); Point view_left_bottom = mViewCentre - model_size / 2.0; Point view_right_top = mViewCentre + model_size / 2.0; double lower, upper, position, max_size; mHRuler.getRange(lower, upper, position, max_size); mHRuler.setRange(view_left_bottom.x, view_right_top.x, position, mZoom * 2000.0); mVRuler.getRange(lower, upper, position, max_size); mVRuler.setRange(view_right_top.y, view_left_bottom.y, 0.0, mZoom * 2000.0); } void update_adjustments() { Vector model_size = screen_to_model(mViewSize); Point view_left_bottom = mViewCentre - model_size / 2.0; Point view_right_top = mViewCentre + model_size / 2.0; // Adjust the canvas size if necessary mCanvasLeftBottom = min_extents(mCanvasLeftBottom, view_left_bottom); mCanvasRightTop = max_extents(mCanvasRightTop, view_right_top); Vector canvas_size = mCanvasRightTop - mCanvasLeftBottom; // Update the adjustments GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct(); GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct(); gtk_adjustment_set_lower(h_gtkAdjustment, mCanvasLeftBottom.x); gtk_adjustment_set_upper(h_gtkAdjustment, mCanvasRightTop.x); gtk_adjustment_set_value(h_gtkAdjustment, view_left_bottom.x); gtk_adjustment_set_step_increment(h_gtkAdjustment, canvas_size.x / 10.0); gtk_adjustment_set_page_increment(h_gtkAdjustment, canvas_size.x / 5.0); gtk_adjustment_set_page_size(h_gtkAdjustment, model_size.x); gtk_adjustment_set_lower(v_gtkAdjustment, mCanvasLeftBottom.y); gtk_adjustment_set_upper(v_gtkAdjustment, mCanvasRightTop.y); gtk_adjustment_set_value(v_gtkAdjustment, view_left_bottom.y); gtk_adjustment_set_step_increment(v_gtkAdjustment, canvas_size.y / 10.0); gtk_adjustment_set_page_increment(v_gtkAdjustment, canvas_size.y / 5.0); gtk_adjustment_set_page_size(v_gtkAdjustment, model_size.y); mHAdjustment.changed; mHAdjustment.valueChanged; mVAdjustment.changed; mVAdjustment.valueChanged; } double clamp_zoom(double zoom) { return clamp(zoom, 0.02, 50.0); } // Model units are in millimetres // Screen units are in pixels double mZoom; // pixels-per-model-unit (mm) Point mViewCentre; // model: where in the model is the centre of our view Point mCanvasLeftBottom; // model: bottom left corner of canvas Point mCanvasRightTop; // model: top right corner of canvas Vector mViewSize; // screen: size of view window in pixels // Child widgets: HRuler mHRuler; VRuler mVRuler; DrawingArea mDrawingArea; Adjustment mHAdjustment; HScrollbar mHScrollbar; Adjustment mVAdjustment; VScrollbar mVScrollbar; // Layers: Layer[] mLayers; EventHandler mEventHandler; double mPPI; } }