// Render the dirtied window
void OnExpose(object sender, ExposeEventArgs args)
{
DrawingArea area = (DrawingArea)sender;
Cairo.Context cr = Gdk.CairoHelper.Create(area.GdkWindow);
// Clear background
cr.SetSourceRGB(1.0, 1.0, 1.0);
cr.Paint();
// Set the coordinate system origin at bottom left
cr.Translate(0, area.Allocation.Height);
cr.Scale(1.0, -1.0);
// Render all Drawables, resetting the coordinate transform for each
foreach (Drawable d in drawable)
{
cr.Save();
d.Draw(cr);
cr.Restore();
}
cr.GetTarget().Dispose();
((IDisposable)cr).Dispose();
}
public static void DrawCircle(DrawingArea da,
int width,
int height,
double lineWidth,
double[] lineColor,
double[] fillColor,
Position position,
double size)
{
Cairo.Context cr = Gdk.CairoHelper.Create(da.GdkWindow);
cr.SetSourceRGB(lineColor[0], lineColor[1], lineColor[2]);
cr.LineWidth = lineWidth;
cr.Translate(position.x * width, position.y * height);
cr.Arc(0, 0, size * width / 100f, 0, 2 * Math.PI);
cr.StrokePreserve();
cr.SetSourceRGB(fillColor[0], fillColor[1], fillColor[2]);
cr.Fill();
((IDisposable)cr.GetTarget()).Dispose();
((IDisposable)cr).Dispose();
}
public static void DrawLine(DrawingArea da,
int width,
int height,
double lineWidth,
Cairo.Color lineColor,
Position positionStart,
Position positionEnd
)
{
Cairo.Context cr = Gdk.CairoHelper.Create(da.GdkWindow);
cr.Translate(positionStart.x * width, positionStart.y * height);
cr.LineWidth = lineWidth * width / (3 * 100f);
cr.SetSourceColor(lineColor);
cr.MoveTo(0, 0);
cr.LineTo((positionEnd.x - positionStart.x) * width, (positionEnd.y - positionStart.y) * height);
cr.Stroke();
((IDisposable)cr.GetTarget()).Dispose();
((IDisposable)cr).Dispose();
}