virtual void OnPaint(Canvas &canvas) override {
canvas.ClearWhite();
const PixelRect rc = canvas.GetRect();
PixelPoint pt = rc.GetCenter();
canvas.SelectBlackPen();
canvas.SelectHollowBrush();
canvas.DrawCircle(pt.x, pt.y, 2);
renderer.Draw(canvas, Angle::Zero(), wind, pt, rc, WindArrowStyle::ARROW_HEAD);
}
void OnPaint(Canvas &canvas) {
canvas.ClearWhite();
PixelRect rc = {
0, 0, (PixelScalar)canvas.get_width(), (PixelScalar)canvas.get_height()
};
RasterPoint pt = {
(PixelScalar)(rc.right / 2), (PixelScalar)(rc.bottom / 2)
};
canvas.SelectBlackPen();
canvas.SelectHollowBrush();
canvas.DrawCircle(pt.x, pt.y, 2);
renderer.Draw(canvas, Angle::Zero(), wind, pt, rc, false);
}