public override int Draw(OpenGL gl, Texture tex)
{
float a = this.Length / 2;
float h = this.Height / 2;
gl.PushMatrix();
//Thực hiện các hàm biến đổi Affine
gl.Translate(this.Translate[0], this.Translate[1], this.Translate[2]);
gl.Scale(this.Scale[0], this.Scale[1], this.Scale[2]);
gl.Rotate(this.Rotate[0], this.Rotate[1], this.Rotate[2]);
//Hàm vẽ các mặt của ảnh
for (int i = 0; i < 2; i++)
{
if (i == 0)
{
gl.PolygonMode(OpenGL.GL_FRONT_AND_BACK, OpenGL.GL_LINE);
if (isSelected)
{
gl.LineWidth(5.0f);
gl.Color(Color.Orange.R, Color.Orange.G, Color.Orange.B);
}
else
{
gl.LineWidth(1.0f);
gl.Color(Color.Black.R, Color.Black.G, Color.Black.B);
}
}
else
{
//Set the polygon mode to be filled triangles
gl.PolygonMode(OpenGL.GL_FRONT_AND_BACK, OpenGL.GL_FILL);
gl.Color(Color.R, Color.G, Color.B);
}
gl.Begin(OpenGL.GL_QUADS);
//BOT
gl.TexCoord(0.0f, 0.0f); gl.Vertex(a, a, -h); // Top Right Of The Quad (Bottom)
gl.TexCoord(1.0f, 0.0f); gl.Vertex(a, -a, -h); // Top Left Of The Quad (Bottom)
gl.TexCoord(1.0f, 1.0f); gl.Vertex(-a, -a, -h); // Bottom Left Of The Quad (Bottom)
gl.TexCoord(0.0f, 1.0f); gl.Vertex(-a, a, -h); // Bottom Right Of The Quad (Bottom)
gl.End();
gl.Begin(OpenGL.GL_TRIANGLES);
//FRONT
gl.TexCoord(0.0f, 0.0f); gl.Vertex(a, -a, -h); // Top Right Of The Quad (Front)
gl.TexCoord(1.0f, 0.0f); gl.Vertex(a, a, -h); // Top Left Of The Quad (Front)
gl.TexCoord(1.0f, 1.0f); gl.Vertex(0, 0, h); // Bottom Left Of The Quad (Front)
//BACK
gl.TexCoord(0.0f, 0.0f); gl.Vertex(-a, a, -h); // Top Right Of The Quad (Back)
gl.TexCoord(1.0f, 0.0f); gl.Vertex(-a, -a, -h); // Top Left Of The Quad (Back)
gl.TexCoord(1.0f, 1.0f); gl.Vertex(0, 0, h); // Bottom Left Of The Quad (Back)
////LEFT
gl.TexCoord(0.0f, 0.0f); gl.Vertex(a, -a, -h); // Top Right Of The Quad (Left)
gl.TexCoord(1.0f, 0.0f); gl.Vertex(-a, -a, -h); // Top Left Of The Quad (Left)
gl.TexCoord(1.0f, 1.0f); gl.Vertex(0, 0, h); // Bottom Left Of The Quad (Left)
////RIGHT
gl.TexCoord(0.0f, 0.0f); gl.Vertex(-a, a, -h); // Top Right Of The Quad (Right)
gl.TexCoord(1.0f, 0.0f); gl.Vertex(a, a, -h); // Top Left Of The Quad (Right)
gl.TexCoord(1.0f, 1.0f); gl.Vertex(0, 0, h); // Bottom Left Of The Quad (Right)
gl.End();
}
gl.PopMatrix();
return(1);
}