protected override void OnMouseDown(int x, int y)
{
_latestBrushPathCache = null;
_latestMousePoint = new PixelFarm.Agg.Imaging.Point(x, y);
_points.Clear();
_myBrushPath = new PixelFarm.Agg.Samples.MyBrushPath();
_myBrushPath.FillColor = PixelFarm.Drawing.Color.Red;
_points.Add(new System.Drawing.Point(x, y));
_myBrushPath.AddPointAtFirst(x, y);
}
protected override void OnMouseMove(int x, int y)
{
_points.Add(new System.Drawing.Point(x, y));
//dragging
//---------
//find diff
Vector newPoint = new Vector(x, y);
//find distance
Vector oldPoint = new Vector(_latestMousePoint.x, _latestMousePoint.y);
Vector delta = (newPoint - oldPoint) / 2; // 2,4 etc
//midpoint
Vector midPoint = (newPoint + oldPoint) / 2;
delta = delta.NewLength(5);
delta.Rotate(90);
Vector newTopPoint = midPoint + delta;
Vector newBottomPoint = midPoint - delta;
//bottom point
_myBrushPath.AddPointAtFirst((int)newBottomPoint.X, (int)newBottomPoint.Y);
_myBrushPath.AddPointAtLast((int)newTopPoint.X, (int)newTopPoint.Y);
_latestMousePoint = new PixelFarm.Agg.Imaging.Point(x, y);
}