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Diffstat (limited to 'src/gui/piePreviewAddSign.vala')
| -rw-r--r-- | src/gui/piePreviewAddSign.vala | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/gui/piePreviewAddSign.vala b/src/gui/piePreviewAddSign.vala new file mode 100644 index 0000000..ee8c14b --- /dev/null +++ b/src/gui/piePreviewAddSign.vala @@ -0,0 +1,220 @@ +/* +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); + } + } +} + +} |