private void InitVertexPositions(Vector position, double width, double height)
{
double halfWidth = width / 2;
double halfHeight = height / 2;
// Clockwise creation of two triangles to make a quad.
// TopLeft, TopRight, BottomLeft
_vertexPositions[0] = new Vector(position.X - halfWidth, position.Y + halfHeight, position.Z);
_vertexPositions[1] = new Vector(position.X + halfWidth, position.Y + halfHeight, position.Z);
_vertexPositions[2] = new Vector(position.X - halfWidth, position.Y - halfHeight, position.Z);
// TopRight, BottomRight, BottomLeft
_vertexPositions[3] = new Vector(position.X + halfWidth, position.Y + halfHeight, position.Z);
_vertexPositions[4] = new Vector(position.X + halfWidth, position.Y - halfHeight, position.Z);
_vertexPositions[5] = new Vector(position.X - halfWidth, position.Y - halfHeight, position.Z);
}
public void SetPosition(Vector position)
{
InitVertexPositions(position, GetWidth(), GetHeight());
}
public void DrawImmediateModeVertex(Vector position, Color color, Point uvs)
{
Gl.glColor4f(color.Red, color.Green, color.Blue, color.Alpha);
Gl.glTexCoord2f(uvs.X, uvs.Y);
Gl.glVertex3d(position.X, position.Y, position.Z);
}