Mercurial > projects > doodle
view canvas.d @ 18:df8d81d9f499
Lasso fiddling
author | David Bryant <daveb@acres.com.au> |
---|---|
date | Mon, 13 Jul 2009 17:08:32 +0930 |
parents | c643c04e3f5e |
children | 22abbf4cde96 |
line wrap: on
line source
module canvas; public { import icanvas; import tk.geometry; import tk.events; } private { import tk.gtk_support; import tk.misc; import cairo.Surface; import cairo_support; import std.math; import std.stdio; 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 gdk.Drawable; import gtkc.gtk; } // 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); mDamage = Rectangle.DEFAULT; mLayers = layers.dup; mEventHandler = event_handler; mPPI = ppi; /* writefln("Layer bounds: %s", layer_bounds); writefln("Canvas bounds: %s", mCanvasBounds); writefln("View centre: %s", mViewCentre); */ // 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.PIXELS); mVRuler = new VRuler; attach(mVRuler, 0, 1, 1, 2, AttachOptions.SHRINK, AttachOptions.FILL | AttachOptions.EXPAND, 0, 0); mVRuler.setMetric(GtkMetricType.PIXELS); 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); mHScrollbar.setInverted(false); 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); mVScrollbar.setInverted(true); attach(mVScrollbar, 2, 3, 1, 2, AttachOptions.SHRINK, AttachOptions.FILL | AttachOptions.EXPAND, 0, 0); } override void rel_zoom(Point pixel_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 = pixel_to_model(pixel_datum); Vector pixel_distance = model_to_pixel(old_model_datum - mViewCentre); mZoom = clamp_zoom(factor * mZoom); mViewCentre = old_model_datum - pixel_to_model(pixel_distance); update_adjustments; update_rulers; queueDraw; } override void rel_pan(Vector pixel_displacement) { mViewCentre = mViewCentre + pixel_to_model(pixel_displacement); update_adjustments; update_rulers; queueDraw; } override void damage_model(Rectangle area) { mDamage = mDamage | model_to_pixel(area); } override void damage_pixel(Rectangle area) { mDamage = mDamage | area; } override double zoom() const { return mZoom; } override Point model_to_pixel(Point model) const { return Point.DEFAULT + mViewSize / 2.0 + mZoom * (model - mViewCentre); } override Point pixel_to_model(Point pixel) const { return mViewCentre + (pixel - mViewSize / 2.0 - Point.DEFAULT) / mZoom; } override Vector model_to_pixel(Vector model) const { return mZoom * model; } override Vector pixel_to_model(Vector pixel) const { return pixel / mZoom; } override double model_to_pixel(double model) const { return mZoom * model; } override double pixel_to_model(double pixel) const { return pixel / mZoom; } override Rectangle model_to_pixel(Rectangle model) const { return Rectangle(model_to_pixel(model.position), model_to_pixel(model.size)); } override Rectangle pixel_to_model(Rectangle model) const { return Rectangle(pixel_to_model(model.position), pixel_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); if (!mHadConfigure) { 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 layer_bounds = Rectangle.DEFAULT; foreach (ref layer; mLayers) { layer_bounds = layer_bounds | layer.bounds; } assert(layer_bounds.valid); mCanvasBounds = layer_bounds.moved(-layer_bounds.size).expanded(2.0 * layer_bounds.size); mViewCentre = mCanvasBounds.centre; mHadConfigure = true; } mViewSize = Vector(cast(double)event.width, cast(double)event.height); update_adjustments; update_rulers; //writefln("Canvas bounds: %s", mCanvasBounds); //writefln("View centre: %s", mViewCentre); 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 pixel_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; pixel_cr.save; { // FIXME restore clipping // Setup model context //rectangle(model_cr, damage); //model_cr.clip; GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct; GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct; model_cr.scale(mZoom, -mZoom); model_cr.translate(-gtk_adjustment_get_value(h_gtkAdjustment), -gtk_adjustment_get_value(v_gtkAdjustment) - gtk_adjustment_get_page_size(v_gtkAdjustment)); // Setup pixel context pixel_cr.translate(0.0, mViewSize.y); pixel_cr.scale(1.0, -1.0); //rectangle(pixel_cr, damage); //pixel_cr.clip; // Fill the background pixel_cr.save; { // Make the window light grey pixel_cr.setSourceRgba(0.6, 0.6, 0.6, 1.0); rectangle(pixel_cr, damage); pixel_cr.fill; } pixel_cr.restore; // Draw each layer foreach(ref layer; mLayers) { model_cr.save; pixel_cr.save; { layer.draw(this, damage, model_cr, pixel_cr); } pixel_cr.restore; model_cr.restore; } } pixel_cr.restore; model_cr.restore; return true; } bool onButtonPress(GdkEventButton * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got button event\n"); Point pixel_point = Point(event.x + 0.5, mViewSize.y - (event.y + 0.5)); Point model_point = pixel_to_model(pixel_point); auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), gtk2tk_button_name(event.button), pixel_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_button_press(this, button_event); process_damage; return true; } bool onButtonRelease(GdkEventButton * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got button event\n"); Point pixel_point = Point(event.x + 0.5, mViewSize.y - (event.y + 0.5)); Point model_point = pixel_to_model(pixel_point); auto button_event = new ButtonEvent(gtk2tk_button_action(event.type), gtk2tk_button_name(event.button), pixel_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_button_release(this, button_event); process_damage; 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); process_damage; 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 pixel_point = Point(event.x + 0.5, mViewSize.y - (event.y + 0.5)); Point model_point = pixel_to_model(pixel_point); auto motion_event = new MotionEvent(pixel_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_motion(this, motion_event); process_damage; return true; } bool onScroll(GdkEventScroll * event, Widget widget) { assert(widget is mDrawingArea); //writefln("Got scroll\n"); Point pixel_point = Point(event.x + 0.5, mViewSize.y - (event.y + 0.5)); Point model_point = pixel_to_model(pixel_point); auto scroll_event = new ScrollEvent(gtk2tk_direction(event.direction), pixel_point, model_point, gtk2tk_mask(event.state)); mEventHandler.handle_scroll(this, scroll_event); process_damage; return true; } void onValueChanged(Adjustment adjustment) { GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct; GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct; Point view_left_top = Point(gtk_adjustment_get_value(h_gtkAdjustment), gtk_adjustment_get_value(v_gtkAdjustment)); Vector model_size = pixel_to_model(mViewSize); //writefln("%s", view_left_bottom); mViewCentre = view_left_top + model_size / 2.0; writefln("onValueChanged mViewCentre: %s", mViewCentre); update_rulers; queueDraw; } void update_rulers() { Vector model_size = pixel_to_model(mViewSize); Point view_left_bottom = mViewCentre - model_size / 2.0; Point view_right_top = mViewCentre + model_size / 2.0; // Define these just to obtain the position // below and we can preserve it double lower, upper, position, max_size; mHRuler.getRange(lower, upper, position, max_size); writefln("HRuler: %f %f %f", view_left_bottom.x, view_right_top.x, position); mHRuler.setRange(view_left_bottom.x, view_right_top.x, position, mZoom * 50.0); mVRuler.getRange(lower, upper, position, max_size); mVRuler.setRange(view_right_top.y, view_left_bottom.y, position, mZoom * 50.0); } void update_adjustments() { Vector model_size = pixel_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 mCanvasBounds = Rectangle(min_extents(mCanvasBounds.min_corner, view_left_bottom), max_extents(mCanvasBounds.max_corner, view_right_top)); // Update the adjustments GtkAdjustment * h_gtkAdjustment = mHAdjustment.getAdjustmentStruct; GtkAdjustment * v_gtkAdjustment = mVAdjustment.getAdjustmentStruct; gtk_adjustment_set_lower(h_gtkAdjustment, mCanvasBounds.min_corner.x); gtk_adjustment_set_upper(h_gtkAdjustment, mCanvasBounds.max_corner.x); gtk_adjustment_set_value(h_gtkAdjustment, view_left_bottom.x); gtk_adjustment_set_step_increment(h_gtkAdjustment, mCanvasBounds.size.x / 16.0); gtk_adjustment_set_page_increment(h_gtkAdjustment, mCanvasBounds.size.x / 4.0); gtk_adjustment_set_page_size(h_gtkAdjustment, model_size.x); gtk_adjustment_set_lower(v_gtkAdjustment, mCanvasBounds.min_corner.y); gtk_adjustment_set_upper(v_gtkAdjustment, mCanvasBounds.max_corner.y); gtk_adjustment_set_value(v_gtkAdjustment, view_left_bottom.y); gtk_adjustment_set_step_increment(v_gtkAdjustment, mCanvasBounds.size.y / 16.0); gtk_adjustment_set_page_increment(v_gtkAdjustment, mCanvasBounds.size.y / 4.0); gtk_adjustment_set_page_size(v_gtkAdjustment, model_size.y); mHAdjustment.changed; mHAdjustment.valueChanged; mVAdjustment.changed; mVAdjustment.valueChanged; } void process_damage() { if (mDamage.valid) { //writefln("Damage: %s", mDamage); int x, y, w, h; mDamage.get_quantised(x, y, w, h); //writefln("Quantised damage: %d %d %d %d", x, y, w, h); y = cast(int)mViewSize.y - (y + h); //writefln("Flipped Quantised damage: %d %d %d %d", x, y, w, h); // FIXME only redraw the damaged area //mDrawingArea.queueDrawArea(x, y, w, h); mDrawingArea.queueDraw(); mDamage = Rectangle.DEFAULT; } else { //writefln("No damage"); } } double clamp_zoom(double zoom) { return clamp(zoom, 0.2, 10.0); } bool mHadConfigure; Rectangle mDamage; // pixels // Model units are in millimetres // Screen units are in pixels double mZoom; // pixels-per-model-unit (mm) Vector mViewSize; // pixel: size of view window in pixels Point mViewCentre; // model: where in the model is the centre of our view Rectangle mCanvasBounds; // model: // Child widgets: HRuler mHRuler; VRuler mVRuler; DrawingArea mDrawingArea; Adjustment mHAdjustment; HScrollbar mHScrollbar; Adjustment mVAdjustment; VScrollbar mVScrollbar; // Layers: Layer[] mLayers; EventHandler mEventHandler; double mPPI; } }