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authorAlessandro Ghedini <al3xbio@gmail.com>2012-01-21 19:07:09 +0100
committerAlessandro Ghedini <al3xbio@gmail.com>2012-01-21 19:07:09 +0100
commit60560a030fda3c539ff9dc1563b9926414a193da (patch)
tree77590b395685a8d48d3615e45629a1610d08c071 /src/gui/piePreviewAddSign.vala
parentd6b2677825cbb423e2099563c16321c3e23d7899 (diff)
Imported Upstream version 0.4.0upstream/0.4.0
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+/*
+Copyright (c) 2011 by Simon Schneegans
+
+This program is free software: you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+more details.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+using GLib.Math;
+
+namespace GnomePie {
+
+/////////////////////////////////////////////////////////////////////////
+/// A liitle plus-sign displayed on the preview widget to indicate where
+/// the user may add a new Slice.
+/////////////////////////////////////////////////////////////////////////
+
+public class PiePreviewAddSign : GLib.Object {
+
+ /////////////////////////////////////////////////////////////////////
+ /// Gets emitted, when the users clicks on this object.
+ /////////////////////////////////////////////////////////////////////
+
+ public signal void on_clicked(int position);
+
+ /////////////////////////////////////////////////////////////////////
+ /// The image used to display this oject.
+ /////////////////////////////////////////////////////////////////////
+
+ public Image icon { get; private set; }
+
+ /////////////////////////////////////////////////////////////////////
+ /// True, when the add sign is currently visible.
+ /////////////////////////////////////////////////////////////////////
+
+ public bool visible { get; private set; default=false; }
+
+ /////////////////////////////////////////////////////////////////////
+ /// The position of the sign in its parent Pie. May be 2.5 for
+ /// example.
+ /////////////////////////////////////////////////////////////////////
+
+ private double position = 0;
+
+ /////////////////////////////////////////////////////////////////////
+ /// The parent renderer.
+ /////////////////////////////////////////////////////////////////////
+
+ private unowned PiePreviewRenderer parent;
+
+ /////////////////////////////////////////////////////////////////////
+ /// Some values used for displaying this sign.
+ /////////////////////////////////////////////////////////////////////
+
+ private double time = 0;
+ private double max_size = 0;
+ private double angle = 0;
+ private AnimatedValue size;
+ private AnimatedValue alpha;
+ private AnimatedValue activity;
+ private AnimatedValue clicked;
+
+ /////////////////////////////////////////////////////////////////////
+ /// C'tor, sets everything up.
+ /////////////////////////////////////////////////////////////////////
+
+ public PiePreviewAddSign(PiePreviewRenderer parent) {
+ this.parent = parent;
+
+ this.size = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, 0, 0, 0, 2.0);
+ this.alpha = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, 0, 0, 0, 0.0);
+ this.activity = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, -3, -3, 0, 0.0);
+ this.clicked = new AnimatedValue.cubic(AnimatedValue.Direction.OUT, 1, 1, 0, 0.0);
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Loads the desired icon for this sign.
+ /////////////////////////////////////////////////////////////////////
+
+ public void load() {
+ this.icon = new Icon("add", 36);
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Updates the position where this object should be displayed.
+ /////////////////////////////////////////////////////////////////////
+
+ public void set_position(int position) {
+ double new_position = position;
+
+ if (!this.parent.drag_n_drop_mode)
+ new_position += 0.5;
+
+ this.position = new_position;
+ this.angle = 2.0 * PI * new_position/parent.slice_count();
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Makes this object visible.
+ /////////////////////////////////////////////////////////////////////
+
+ public void show() {
+ this.visible = true;
+ this.size.reset_target(this.max_size, 0.3);
+ this.alpha.reset_target(1.0, 0.3);
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Makes this object invisible.
+ /////////////////////////////////////////////////////////////////////
+
+ public void hide() {
+ this.visible = false;
+ this.size.reset_target(0.0, 0.3);
+ this.alpha.reset_target(0.0, 0.3);
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Updates the size of this object. All transitions will be smooth.
+ /////////////////////////////////////////////////////////////////////
+
+ public void set_size(double size) {
+ this.max_size = size;
+ this.size.reset_target(size, 0.5);
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Draws the sign to the given context.
+ /////////////////////////////////////////////////////////////////////
+
+ public void draw(double frame_time, Cairo.Context ctx) {
+
+ this.time += frame_time;
+
+ this.size.update(frame_time);
+ this.alpha.update(frame_time);
+ this.activity.update(frame_time);
+ this.clicked.update(frame_time);
+
+ if (this.parent.slice_count() == 0) {
+ ctx.save();
+
+ double scale = this.clicked.val
+ + GLib.Math.sin(this.time*10)*0.02*this.alpha.val
+ + this.alpha.val*0.08 - 0.1;
+ ctx.scale(scale, scale);
+
+ // paint the image
+ icon.paint_on(ctx);
+
+ ctx.restore();
+
+ } else if (this.alpha.val*this.activity.val > 0) {
+ ctx.save();
+
+ // distance from the center
+ double radius = 120;
+
+ // transform the context
+ ctx.translate(cos(this.angle)*radius, sin(this.angle)*radius);
+ double scale = this.size.val*this.clicked.val
+ + this.activity.val*0.07
+ + GLib.Math.sin(this.time*10)*0.03*this.activity.val
+ - 0.1;
+ ctx.scale(scale, scale);
+
+ // paint the image
+ icon.paint_on(ctx, this.alpha.val*this.activity.val);
+
+ ctx.restore();
+ }
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Called when the mouse moves to another position.
+ /////////////////////////////////////////////////////////////////////
+
+ public void on_mouse_move(double angle) {
+ double direction = 2.0 * PI * position/parent.slice_count();
+ double diff = fabs(angle-direction);
+
+ if (diff > PI)
+ diff = 2 * PI - diff;
+
+ if (diff < 0.5*PI/parent.slice_count()) this.activity.reset_target(1.0, 1.0);
+ else this.activity.reset_target(-3.0, 1.5);
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Called when a button of the mouse is pressed.
+ /////////////////////////////////////////////////////////////////////
+
+ public void on_button_press(double x, double y) {
+ if (this.activity.end == 1.0) {
+ this.clicked.reset_target(0.9, 0.1);
+ }
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Called when a button of the mouse is released.
+ /////////////////////////////////////////////////////////////////////
+
+ public void on_button_release(double x, double y) {
+ if (this.clicked.end == 0.9) {
+ this.clicked.reset_target(1.0, 0.1);
+ this.on_clicked((int)this.position);
+ }
+ }
+}
+
+}