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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 Canvas {
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public static readonly int initialSize = 100;
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public static readonly double incrementScale = 1.2;
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private int offsetX = -initialSize/2;
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private int offsetY = -initialSize/2;
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private Cairo.ImageSurface surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, initialSize, initialSize);
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public void draw(Cairo.Context context) {
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context.Save();
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context.Translate(offsetX, offsetY);
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context.SetSource(surface);
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context.Paint();
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context.Restore();
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}
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public void expand(Rectangle rect) {
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int l = offsetX;
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int t = offsetY;
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int r = l + surface.Width;
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int b = t + surface.Height;
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int rl = (int)Math.Floor(rect.x0);
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int rt = (int)Math.Floor(rect.y0);
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int rr = Math.Max(rl, (int)Math.Ceiling(rect.x1));
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int rb = Math.Max(rt, (int)Math.Ceiling(rect.y1));
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int incX = (int)Math.Ceiling(surface.Width*incrementScale);
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int incY = (int)Math.Ceiling(surface.Height*incrementScale);
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if (rl < l) l = rl - incX;
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if (rt < t) t = rt - incY;
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if (rr > r) r = rr + incX;
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if (rb > b) b = rb + incY;
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int w = r - l;
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int h = b - t;
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if (l != offsetX || t != offsetY || w != surface.Width || h != surface.Height) {
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Cairo.ImageSurface newSurface = new Cairo.ImageSurface(Cairo.Format.ARGB32, w, h);
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Cairo.Context context = new Cairo.Context(newSurface);
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context.Translate(offsetX - l, offsetY - t);
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context.SetSource(surface);
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context.Paint();
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context.GetTarget().Flush();
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context.Dispose();
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surface.Dispose();
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offsetX = l;
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offsetY = t;
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surface = newSurface;
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}
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}
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private Cairo.Context getContext() {
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Cairo.Context context = new Cairo.Context(surface);
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context.Antialias = Cairo.Antialias.Gray;
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context.Translate(-offsetX, -offsetY);
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return context;
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}
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public void paintTrack(Track track) {
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expand(track.getBounds());
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Cairo.Context context = getContext();
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track.draw(context);
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context.GetTarget().Flush();
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context.Dispose();
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}
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}
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}
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