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/////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011-2015 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("list-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) {
if (parent.slice_count() > 0) {
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);
} else {
this.activity.reset_target(1.0, 1.0);
}
}
/////////////////////////////////////////////////////////////////////
/// 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.on_clicked((int)this.position);
this.clicked.reset_target(1.0, 0.1);
}
}
}
}
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