Set Sided Polygon in C++

[basilmon]

void PixelPlotterForm::DrawPolygon( int Sides, int X, int Y, int R, Color PixelColour )
{
	int x = X;
	int y = Y;
	int r = R;
	int sides = Sides;

	float cir = PI * (r * 2);

	float edgelength = cir / sides;
	float tempsides = 0;

	float angle = 360 / sides;

	while(tempsides < sides)
	{
      		SetViewportPixel(x + r, y + r, PixelColour);
		r = r + angle;
		tempsides++;
	}
}