protected override void DrawCanvasContent(Graphics graphics)
{
// if our cached copy is old or nonexistant, redraw it and save it
// TODO: this may not be perfectly accurate, since it's possible for someone else to come along and render
// the effect, which would make it non-dirty, but we don't know about it yet. Not ideal. Add a serial or GUID to effect rendering, to be able to track it.
if (EffectNode.Effect.IsDirty || CachedCanvasContent == null ||
CachedCanvasContent.Width != (int)graphics.VisibleClipBounds.Width ||
CachedCanvasContent.Height != (int)graphics.VisibleClipBounds.Height)
{
CachedCanvasContent = new Bitmap((int)graphics.VisibleClipBounds.Width, (int)graphics.VisibleClipBounds.Height);
EffectRasterizer effectRasterizer = new EffectRasterizer();
using (Graphics g = Graphics.FromImage(CachedCanvasContent)) {
effectRasterizer.Rasterize(EffectNode.Effect, g);
}
}
graphics.DrawImage(CachedCanvasContent, 0, 0);
// add text describing the effect
using (Font f = new Font("Arial", 7))
using (Brush b = new SolidBrush(TextColor)) {
graphics.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
graphics.DrawString(EffectNode.Effect.EffectName, f, b, new RectangleF(5, 3, 50, 12));
graphics.DrawString("Start: " + EffectNode.StartTime.ToString(@"m\:ss\.fff"), f, b, new PointF(60, 3));
graphics.DrawString("Length: " + EffectNode.TimeSpan.ToString(@"m\:ss\.fff"), f, b, new PointF(60, 16));
}
ElementTimeHasChangedSinceDraw = false;
}
