private void drawPen(Point currentPoint)
{
var diff = new Point(currentPoint.X - this.lastPoint.X, currentPoint.Y - this.lastPoint.Y);
memg.BeginRender();
D2DEllipse ellipse = new D2DEllipse(D2DPoint.Zero, this.penSize);
D2DRect rect = new D2DRect(0, 0, this.penSize.Width * 2, this.penSize.Height * 2);
float len = (float)Math.Sqrt(diff.X * diff.X + diff.Y * diff.Y);
float seg = 1.0f / len;
// draw a continuous line
for (float t = 0; t < 1; t += seg)
{
float x = this.lastPoint.X + diff.X * t, y = this.lastPoint.Y + diff.Y * t;
if (this.penColor == D2DColor.White)
{
rect.X = x - this.penSize.Width;
rect.Y = y - this.penSize.Height;
memg.FillRectangle(rect, this.penColor);
}
else
{
ellipse.origin = new D2DPoint(x, y);
memg.FillEllipse(ellipse, this.penColor);
}
}
memg.EndRender();
this.lastPoint = currentPoint;
}
protected override void OnRender(unvell.D2DLib.D2DGraphics g)
{
D2DEllipse ellipse = new D2DEllipse();
for (int i = 0; i < stars.Length; i++)
{
var s = stars[i];
if (s.x != 0 && s.y != 0)
{
ellipse.X = s.x;
ellipse.Y = s.y;
ellipse.radiusX = ellipse.radiusY = s.size;
brush.Color = s.color;
g.FillEllipse(ellipse, brush);
}
}
}