public Sprite()
{
VertexPositions = new Vector[VertexAmount];
VertexColors = new Color[VertexAmount];
VertexUVs = new Point[VertexAmount];
InitVertexPositions(new Vector(0, 0, 0), 1, 1);
SetColor(new Color(1, 1, 1, 1));
SetUVs(new Point(0, 0), new Point(1, 1));
}
public void DrawImmediateModeVertex(Vector position, Color color, Point uvs)
{
GL.Color4(color.Red, color.Green, color.Blue, color.Alpha);
GL.TexCoord2(uvs.X, uvs.Y);
GL.Vertex3(position.X, position.Y, position.Z);
}
public void SetPosition(Vector position)
{
InitVertexPositions(position, GetWidth(), GetHeight());
}
private void InitVertexPositions(Vector position, double width, double height)
{
var halfWidth = width/2;
var halfHeight = height/2;
//clockwise creation of two triangles makes 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);
}