/// <summary>
/// Draw the point if it is inside the border rectangle
/// </summary>
public override void Draw(GlRectangle Border)
{
if (Border == null || !Border.isPointInside(this))
{
return;
}
this.Draw();
}
private void DrawPoints(GlRectangle Border, int GlDrawMode)
{
if (Border == null || !ActivateDrawStart())
{
return;
}
ActivateDrawing();
bool isInside = Border.isPointInside(this[0]);
GlPolygon ToDraw = new GlPolygon(this.Center);
if (Border.isPointInside(this[this.CountOfPoints - 1]) != isInside)
{
if (!isInside)
{
ToDraw.AddVertex(this[this.CountOfPoints - 1]);
}
GlPointR2[] I = new GlLineR2(this[0], new GlVectorR2(this[0].X - this[this.CountOfPoints - 1].X,
this[0].Y - this[this.CountOfPoints - 1].Y)).getIntersection(Border);
if (I.Length == 2)
{
ToDraw.AddVertex(new GlLineSegment(this[this.CountOfPoints - 1], this[0]).isPointBelongs(I[0]) ? I[0] : I[1]);
}
else if (I.Length == 1 && new GlLineSegment(this[this.CountOfPoints - 1], this[0]).isPointBelongs(I[0]))
{
ToDraw.AddVertex(I[0]);
}
}
for (int i = 0; i < this.CountOfPoints - 1; i++)
{
if (isInside)
{
ToDraw.AddVertex(this[i]);
}
if (Border.isPointInside(this[i + 1]) != isInside)
{
GlPointR2[] I = new GlLineR2(this[i], new GlVectorR2(this[i + 1].X - this[i].X,
this[i + 1].Y - this[i].Y)).getIntersection(Border);
if (I.Length == 2)
{
ToDraw.AddVertex(new GlLineSegment(this[i], this[i + 1]).isPointBelongs(I[0]) ? I[0] : I[1]);
}
else if (I.Length == 1 && new GlLineSegment(this[i], this[i + 1]).isPointBelongs(I[0]))
{
ToDraw.AddVertex(I[0]);
}
isInside = !isInside;
}
}
Gl.glBegin(GlDrawMode);
for (int i = 0; i < ToDraw.CountOfPoints; i++)
{
if (ToDraw[i] != null)
{
Gl.glVertex2f(ToDraw[i].X, ToDraw[i].Y);
}
}
Gl.glEnd();
ActivateDrawed();
}