static void canvas_EvRedraw(object sender, RedrawEventArgs e)
{
var p = e.Painter;
p.Clear(0);
Ellipse2d el1 = new Ellipse2d(new Point2d(mousex, mousey), 200, 5, 1.0);
Ellipse2d el2 = new Ellipse2d(new Point2d(400, 500), 300, 5, -1);
p.Color = RGB.Red;
p.DrawEllipse(el1.Center.X, el1.Center.Y, el1.MajorRadius, el1.MinorRadius, el1.Rotation);
p.Color = RGB.Green;
p.DrawEllipse(el2.Center.X, el2.Center.Y, el2.MajorRadius, el2.MinorRadius, el2.Rotation);
var intpts = Intersect2d.EllipseEllipse(el1, el2);
if (intpts != null)
{
p.Color = RGB.Yellow;
foreach (Point2d pt in intpts)
{
p.DrawMark(pt.X, pt.Y, MarkType.DiagonalCross, 10);
}
}
}
protected void OnRedraw(Object sender, RedrawEventArgs e)
{
logger.Trace("OnRedraw() received...");
// TODO 3: [performance] invalidate only what really changed (could be tricky)
Invalidate();
}
protected virtual void OnPaint(RedrawEventArgs e)
{
if (Paint != null)
{
Paint(this, e);
}
}
protected void RaiseRedrawEvent(RedrawEventArgs e)
{
logger.Trace("Raising redraw event...");
EventHandler <RedrawEventArgs> handler = Redraw;
if (handler != null)
{
handler(this, e);
}
}
void OnDrawAreaRedraw(object sender, RedrawEventArgs e)
{
if (redraw_backbuffer)
{
if (!RedrawBackbuffer(e.Painter))
{
return; //no active drawing
}
screen_dirty = new Rectangle2i(0, 0, backbuffer.Width - 1, backbuffer.Height - 1); //entire screen is now dirty
}
RedrawOverlay();
}
private void Redraw(object sender, RedrawEventArgs e)
{
// if there's an area to redraw, redraw it
// otherwise redraw the entire buffer
if (e != null && e.HasArea)
{
Draw(e.Area.Left, e.Area.Top, e.Area.Width, e.Area.Height);
}
else
{
Draw();
}
this.Console.SetCursorPosition(0, 0);
}
protected virtual void OnRedraw(RedrawEventArgs e)
{
// Start the redraw. Given the window handle, the OS fills in RedrawWimpBlock
// with details of what needs redrawing.
int more = Wimp.RedrawWindow(ref e.Redraw);
// The origin of the window only needs to be calculated once before entering
// the redraw loop.
e.Origin = WimpWindow.GetOrigin(ref e.Redraw.Visible,
ref e.Redraw.Scroll);
while (more != 0)
{
OnPaint(e);
more = Wimp.GetRectangle(ref e.Redraw);
}
}
