Blame mono/Assistance/ToolFull.cs

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using System;
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using System.Collections.Generic;
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namespace Assistance {
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	public class ToolFull: Tool {
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		public static readonly Drawing.Pen pen = new Drawing.Pen("Dark Green", 3.0);
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		public static readonly double levelAlpha = 0.8;
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		private readonly List<dynamicsurface> stack = new List<dynamicsurface>();</dynamicsurface></dynamicsurface>
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		public ToolFull(Workarea workarea): base(workarea) { }
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		public override ModifierTypes getAvailableModifierTypes()
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			{ return ModifierTypes.All; }
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		private DynamicSurface getSurface(int level)
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			{ return level > 0 ? stack[level - 1] : workarea.document.canvas; }
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		private DynamicSurface getSurface()
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			{ return getSurface(stack.Count); }
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		public override bool paintPush() {
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			stack.Add(new DynamicSurface());
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			return true;
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		}
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		private void paintPoint(DynamicSurface surface, Track.Point point) {
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			Point p = point.position;
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			double r = pen.width*point.pressure;
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			Drawing.Color color = pen.color;
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			if (r < 0.01) r = 0.01;
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			if (r > Geometry.precision && r < 0.5)
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				{ color.a *= r/0.5; r = 0.5; }
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			double rr = r + 1.0;
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			surface.expand(new Rectangle(p.x - rr, p.y - rr, p.x + rr, p.y + rr));
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			surface.context.Save();
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			pen.apply(surface.context);
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			color.apply(surface.context);
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			surface.context.Arc(p.x, p.y, r, 0.0, 2.0*Math.PI);
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			surface.context.Fill();
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			surface.context.Restore();
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		}
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		public override void paintTracks(List<track> tracks) {
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			DynamicSurface surface = getSurface();
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			while(true) {
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				Track track = null;
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				long minTicks = 0;
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				double minTimeOffset = 0.0;
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				foreach(Track t in tracks) {
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					if (t.pointsAdded > 0) {
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						long ticks = t.ticks;
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						double timeOffset = t.timeOffset + t[t.count - t.pointsAdded].time;
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						if (track == null || (ticks - minTicks)*Timer.frequency + timeOffset - minTimeOffset < 0.0) {
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							track = t;
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							minTicks = ticks;
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							minTimeOffset = timeOffset;
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						}
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					}
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				}
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				if (track == null) break;
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				paintPoint(surface, track[track.count - track.pointsAdded]);
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				track.forceAdded(track.pointsAdded - 1);
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			}
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		}
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		public override int paintApply(int count) {
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			int level = stack.Count - count;
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			DynamicSurface surface = getSurface(level);
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			for(int i = level; i < stack.Count; ++i) {
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				surface.expand(stack[i].getBounds(), true);
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				stack[i].draw(surface.context);
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			}
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			paintPop(count);
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			return count;
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		}
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		public override void paintCancel()
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			{ getSurface().clear(); }
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		public override void paintPop(int count) {
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			int level = stack.Count - count;
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			for(int i = stack.Count - 1; i >= level; --i)
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				stack[i].Dispose();
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			stack.RemoveRange(level, count);
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		}
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		public override void draw(Cairo.Context context) {
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			double alpha = levelAlpha;
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			foreach(DynamicSurface surface in stack)
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				{ surface.draw(context, alpha); alpha *= levelAlpha; }
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		}
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	}
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}