func FadeRectangle(one, two Point, horizontal bool) {
gl.Begin(gl.QUADS)
if horizontal { // Clockwise from top right
gl.Vertex3f(one.X, one.Y, one.Z) // Q1
gl.Vertex3f(one.X, two.Y, one.Z) // Q4
gl.Color3f(1, 1, 1)
gl.Vertex3f(two.X, two.Y, two.Z) // Q3
gl.Vertex3f(two.X, one.Y, two.Z) // Q2
} else { // Counter clockwise from top right
gl.Vertex3f(one.X, one.Y, one.Z) // Q1
gl.Vertex3f(two.X, one.Y, one.Z) // Q2
gl.Color3f(1, 1, 1)
gl.Vertex3f(two.X, two.Y, two.Z) // Q3
gl.Vertex3f(one.X, two.Y, two.Z) // Q4
}
gl.End()
}
// draw draws the triangle.
func draw() {
gl.ClearColor(0.3, 0.3, 0.3, 0.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.ShadeModel(gl.SMOOTH)
gl.LoadIdentity()
gl.Translatef(-15.0, -15.0, 0.0)
gl.Begin(gl.TRIANGLES)
gl.Color3f(1.0, 0.0, 0.0)
gl.Vertex2f(0.0, 0.0)
gl.Color3f(0.0, 1.0, 0.0)
gl.Vertex2f(30.0, 0.0)
gl.Color3f(0.0, 0.0, 1.0)
gl.Vertex2f(0.0, 30.0)
gl.End()
win.SwapBuffers()
}
func DrawStarTex(t *data.Star) {
// Find the center point of the texture to rotate around
xav := (t.X1 + t.X2) / 2
yav := (t.Y1 + t.Y2) / 2
//Translate there, rotate, translate back
gl.MatrixMode(gl.MODELVIEW)
gl.Translatef(xav, yav, 0)
gl.Rotatef(gl.Float(t.Theta), 0, 0, 1)
gl.Translatef(-xav, -yav, 0)
//Bind our texture to be drawn by id
gl.Color3f(1, 1, 1)
gl.Enable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, t.TexId)
// Draw a rectangle with the texture stretched to the corners
gl.Begin(gl.QUADS)
// Stretch the texture to its 4 corners.
gl.TexCoord2d(0, 0)
gl.Vertex2f(t.X1, t.Y1)
gl.TexCoord2d(0, 1)
gl.Vertex2f(t.X1, t.Y2)
gl.TexCoord2d(1, 1)
gl.Vertex2f(t.X2, t.Y2)
gl.TexCoord2d(1, 0)
gl.Vertex2f(t.X2, t.Y1)
gl.End()
// Unbind the texture in case something else wants to draw
gl.Disable(gl.TEXTURE_2D)
// Reset the matrix
gl.LoadIdentity()
}