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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 {
/////////////////////////////////////////////////////////////////////////
/// Renders a Slice of a Pie. According to the current theme.
/////////////////////////////////////////////////////////////////////////
public class SliceRenderer : GLib.Object {
/////////////////////////////////////////////////////////////////////
/// Whether this slice is active (hovered) or not.
/////////////////////////////////////////////////////////////////////
public bool active {get; private set; default = false;}
/////////////////////////////////////////////////////////////////////
/// The Image which should be displayed as center caption when this
/// slice is active.
/////////////////////////////////////////////////////////////////////
public Image caption {get; private set;}
/////////////////////////////////////////////////////////////////////
/// The color which should be used for colorizing center layers when
/// this slice is active.
/////////////////////////////////////////////////////////////////////
public Color color {get; private set;}
/////////////////////////////////////////////////////////////////////
/// The two Images used, when this slice is active or not.
/////////////////////////////////////////////////////////////////////
private Image active_icon;
private Image inactive_icon;
/////////////////////////////////////////////////////////////////////
/// The Image displaying the associated hot key of this slice.
/////////////////////////////////////////////////////////////////////
private Image hotkey;
/////////////////////////////////////////////////////////////////////
/// The Action which is rendered by this SliceRenderer.
/////////////////////////////////////////////////////////////////////
private Action action;
/////////////////////////////////////////////////////////////////////
/// The PieRenderer which owns this SliceRenderer.
/////////////////////////////////////////////////////////////////////
private unowned PieRenderer parent;
/////////////////////////////////////////////////////////////////////
/// The index of this slice in a pie. Clockwise assigned, starting
/// from the right-most slice.
/////////////////////////////////////////////////////////////////////
private int position;
/////////////////////////////////////////////////////////////////////
/// AnimatedValues needed for a slice.
/////////////////////////////////////////////////////////////////////
private AnimatedValue fade; // for transitions from active to inactive
private AnimatedValue scale; // for zoom effect
private AnimatedValue alpha; // for fading in/out
private AnimatedValue fade_rotation; // for fading in/out
private AnimatedValue fade_scale; // for fading in/out
/////////////////////////////////////////////////////////////////////
/// C'tor, initializes all AnimatedValues.
/////////////////////////////////////////////////////////////////////
public SliceRenderer(PieRenderer parent) {
this.parent = parent;
this.fade = new AnimatedValue.linear(0.0, 0.0, Config.global.theme.transition_time);
this.alpha = new AnimatedValue.linear(0.0, 1.0, Config.global.theme.fade_in_time);
this.scale = new AnimatedValue.cubic(AnimatedValue.Direction.OUT,
1.0/Config.global.theme.max_zoom,
1.0/Config.global.theme.max_zoom,
Config.global.theme.transition_time,
Config.global.theme.springiness);
this.fade_scale = new AnimatedValue.cubic(AnimatedValue.Direction.OUT,
Config.global.theme.fade_in_zoom, 1.0,
Config.global.theme.fade_in_time,
Config.global.theme.springiness);
this.fade_rotation = new AnimatedValue.cubic(AnimatedValue.Direction.OUT,
Config.global.theme.fade_in_rotation, 0.0,
Config.global.theme.fade_in_time);
}
/////////////////////////////////////////////////////////////////////
/// Loads an Action. All members are initialized accordingly.
/////////////////////////////////////////////////////////////////////
public void load(Action action, int position) {
this.position = position;
this.action = action;
if (Config.global.theme.caption)
this.caption = new RenderedText(action.name,
Config.global.theme.caption_width,
Config.global.theme.caption_height,
Config.global.theme.caption_font,
Config.global.theme.caption_color,
Config.global.global_scale);
this.active_icon = new ThemedIcon(action.icon, true);
this.inactive_icon = new ThemedIcon(action.icon, false);
this.color = new Color.from_icon(this.active_icon);
string hotkey_label = "";
if (position < 10) {
hotkey_label = "%u".printf(position);
} else if (position < 36) {
hotkey_label = "%c".printf((char)(55 + position));
}
this.hotkey = new RenderedText(hotkey_label, (int)Config.global.theme.slice_radius*2,
(int)Config.global.theme.slice_radius*2, "sans 20",
Config.global.theme.caption_color, Config.global.global_scale);
}
/////////////////////////////////////////////////////////////////////
/// Activaes the Action of this slice.
/////////////////////////////////////////////////////////////////////
public void activate() {
action.activate();
}
/////////////////////////////////////////////////////////////////////
/// Initiates the fade-out animation by resetting the targets of the
/// AnimatedValues to 0.0.
/////////////////////////////////////////////////////////////////////
public void fade_out() {
this.alpha.reset_target(0.0, Config.global.theme.fade_out_time);
this.fade_scale = new AnimatedValue.cubic(AnimatedValue.Direction.IN,
this.fade_scale.val,
Config.global.theme.fade_out_zoom,
Config.global.theme.fade_out_time,
Config.global.theme.springiness);
this.fade_rotation = new AnimatedValue.cubic(AnimatedValue.Direction.IN,
this.fade_rotation.val,
Config.global.theme.fade_out_rotation,
Config.global.theme.fade_out_time);
}
/////////////////////////////////////////////////////////////////////
/// Should be called if the active slice of the PieRenderer changes.
/// The members activity, caption and color are set accordingly.
/////////////////////////////////////////////////////////////////////
public void set_active_slice(SliceRenderer? active_slice) {
if (active_slice == this) {
this.fade.reset_target(1.0, Config.global.theme.transition_time);
} else {
this.fade.reset_target(0.0, Config.global.theme.transition_time);
}
}
/////////////////////////////////////////////////////////////////////
/// Draws all layers of the slice.
/////////////////////////////////////////////////////////////////////
public void draw(double frame_time, Cairo.Context ctx, double angle, double distance) {
// update the AnimatedValues
this.scale.update(frame_time);
this.alpha.update(frame_time);
this.fade.update(frame_time);
this.fade_scale.update(frame_time);
this.fade_rotation.update(frame_time);
double direction = 2.0 * PI * position/parent.slice_count() + this.fade_rotation.val;
double max_scale = 1.0/Config.global.theme.max_zoom;
double diff = fabs(angle-direction);
if (diff > PI)
diff = 2 * PI - diff;
if (diff < 2 * PI * Config.global.theme.zoom_range)
max_scale = (Config.global.theme.max_zoom/(diff * (Config.global.theme.max_zoom - 1)
/(2 * PI * Config.global.theme.zoom_range) + 1))
/Config.global.theme.max_zoom;
active = ((parent.active_slice >= 0) && (diff < PI/parent.slice_count()));
max_scale = (parent.active_slice >= 0 ? max_scale : 1.0/Config.global.theme.max_zoom);
if (fabs(this.scale.end - max_scale) > Config.global.theme.max_zoom*0.005)
this.scale.reset_target(max_scale, Config.global.theme.transition_time);
ctx.save();
// distance from the center
double radius = Config.global.theme.radius;
// increase radius if there are many slices in a pie
if (atan((Config.global.theme.slice_radius+Config.global.theme.slice_gap)
/(radius/Config.global.theme.max_zoom)) > PI/parent.slice_count()) {
radius = (Config.global.theme.slice_radius+Config.global.theme.slice_gap)
/tan(PI/parent.slice_count())*Config.global.theme.max_zoom;
}
// transform the context
ctx.scale(scale.val*fade_scale.val, scale.val*fade_scale.val);
ctx.translate(cos(direction)*radius, sin(direction)*radius);
ctx.push_group();
ctx.set_operator(Cairo.Operator.ADD);
// paint the images
if (fade.val > 0.0) active_icon.paint_on(ctx, this.alpha.val*this.fade.val);
if (fade.val < 1.0) inactive_icon.paint_on(ctx, this.alpha.val*(1.0 - fade.val));
if (this.parent.show_hotkeys) {
ctx.set_operator(Cairo.Operator.ATOP);
ctx.set_source_rgba(0, 0, 0, 0.5);
ctx.paint();
}
ctx.set_operator(Cairo.Operator.OVER);
ctx.pop_group_to_source();
ctx.paint();
// draw hotkeys if necassary
if (this.parent.show_hotkeys)
this.hotkey.paint_on(ctx, 1.0);
ctx.restore();
}
}
}
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