public void Setup(int ViewWidth, int ViewHeight)
/* initial setup for drawing that doesn't need to be done for every frame. */
{
if (!SetupDone) {
ArrowShape = MakeArrow(Shaded);
SetupDone = true;
} /*if*/
ProjectionMatrix =
Mat4f.frustum(
/*L =*/ -(float) ViewWidth / ViewHeight,
/*R =*/ (float) ViewWidth / ViewHeight,
/*B =*/ -1.0f,
/*T =*/ 1.0f,
/*N =*/ 1.0f,
/*F =*/ 10.0f)
.mul(Mat4f.translation(new Vec3f(0, 0, -3.0f)));
} /*Setup*/
public void Draw(double AtTime)
/* draws the arrow in its orientation according to the specified time. Setup
must already have been called on current GL context. */
{
final float Azi = (float) (Math.PI * AtTime);
final float Elev = (float) (Math.PI * Math.sin(0.25 * Math.PI * AtTime));
final float Roll = (float) (Math.PI / 10.0 * Math.sin(0.25 * Math.PI * AtTime));
ArrowShape.Draw(
/*ProjectionMatrix =*/ ProjectionMatrix,
/*ModelViewMatrix =*/ Mat4f.rotation(Mat4f.AXIS_Z, Azi)
.mul(Mat4f.rotation(Mat4f.AXIS_X, Elev))
.mul(Mat4f.rotation(Mat4f.AXIS_Y, Roll))
.mul(Mat4f.scaling(2.0f, 2.0f, 2.0f)),
/*Uniforms =*/ new GLUseful.ShaderVarVal[] {
new GLUseful.ShaderVarVal("light_direction", new float[] {-0.7f, 0.7f, 0.0f}),
new GLUseful.ShaderVarVal("light_brightness", 1.0f),
new GLUseful.ShaderVarVal("light_contrast", 0.5f),
new GLUseful.ShaderVarVal("vertex_color", ArrowColor),
});
} /*Draw*/