@Override
public void display(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
// to position the camera.
gl.glTranslated(0, 0, -1);
// Forgetting to clear the depth buffer can cause problems
// such as empty black screens.
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
float matAmbAndDifR[] = {0.9f, 0.0f, 0.0f, 0.75f};
float matAmbAndDifG[] = {0.0f, 0.5f, 0.0f, 1.0f};
gl.glBegin(GL2.GL_TRIANGLES);
{
// One in drawn first and in front has alpha
// gl.glColor4f(1f,0f,0f,1f);
// CCW ordering of vertices
double p0[] = {1, 0, -1};
double p1[] = {0, 1, -1};
double p2[] = {-1, 0, -1};
gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_AMBIENT_AND_DIFFUSE, matAmbAndDifG, 0);
// gl.glColor4f(0,1,0,1f);
gl.glVertex3d(2, 0, -2);
gl.glVertex3d(1, 1, -2);
gl.glVertex3d(0, 0, -2);
gl.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_AMBIENT_AND_DIFFUSE, matAmbAndDifR, 0);
gl.glVertex3dv(p0, 0);
gl.glVertex3dv(p1, 0);
gl.glVertex3dv(p2, 0);
}
gl.glEnd();
gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_FILL);
}
@Override
public void display(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
// Move camera back a little
gl.glTranslated(0, 0, -1);
// Forgetting to clear the depth buffer can cause problems
// such as empty black screens.
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
gl.glBegin(GL2.GL_TRIANGLES);
{
// Need to draw transparent one last
gl.glColor4f(1f, 0f, 0f, 0.75f); // try with 0.25
// CCW ordering of vertices
double p0[] = {1, 0, -1};
double p1[] = {0, 1, -1};
double p2[] = {-1, 0, -1};
// Can pass in an array and an offset into the array
gl.glVertex3dv(p0, 0);
gl.glVertex3dv(p1, 0);
gl.glVertex3dv(p2, 0);
// Opaque one (at back) must be drawn before
// transparent one in front
gl.glColor4f(0, 1, 0, 1f);
gl.glVertex3d(2, 0, -2);
gl.glVertex3d(1, 1, -2);
gl.glVertex3d(0, 0, -2);
}
gl.glEnd();
}
public void vertex(Object vertexData) {
// p("vertex");
double[] pointer;
if (vertexData instanceof double[]) {
pointer = (double[]) vertexData;
// p("vd = " + pointer[0] + " " + pointer[1] + " " + pointer[2]);
if (pointer.length == 6) {
// p("adding color");
gl.glColor3dv(pointer, 3);
}
gl.glVertex3dv(pointer, 0);
if (targetPath != null) {
targetPath.addPoint(pointer);
}
}
}
