diff options
Diffstat (limited to 'src/demos/gears')
| -rw-r--r-- | src/demos/gears/Gears.java | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/demos/gears/Gears.java b/src/demos/gears/Gears.java index efd7d09..4ae780e 100644 --- a/src/demos/gears/Gears.java +++ b/src/demos/gears/Gears.java @@ -112,9 +112,14 @@ public class Gears implements GLEventListener, MouseListener, MouseMotionListene } public void display(GLAutoDrawable drawable) { + // Turn the gears' teeth angle += 2.0f; + // Get the GL corresponding to the drawable we are animating GL gl = drawable.getGL(); + + // Special handling for the case where the GLJPanel is translucent + // and wants to be composited with other Java 2D content if ((drawable instanceof GLJPanel) && !((GLJPanel) drawable).isOpaque() && ((GLJPanel) drawable).shouldPreserveColorBufferIfTranslucent()) { @@ -123,29 +128,36 @@ public class Gears implements GLEventListener, MouseListener, MouseMotionListene gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); } + // Rotate the entire assembly of gears based on how the user + // dragged the mouse around gl.glPushMatrix(); gl.glRotatef(view_rotx, 1.0f, 0.0f, 0.0f); gl.glRotatef(view_roty, 0.0f, 1.0f, 0.0f); gl.glRotatef(view_rotz, 0.0f, 0.0f, 1.0f); + // Place the first gear and call its display list gl.glPushMatrix(); gl.glTranslatef(-3.0f, -2.0f, 0.0f); gl.glRotatef(angle, 0.0f, 0.0f, 1.0f); gl.glCallList(gear1); gl.glPopMatrix(); + // Place the second gear and call its display list gl.glPushMatrix(); gl.glTranslatef(3.1f, -2.0f, 0.0f); gl.glRotatef(-2.0f * angle - 9.0f, 0.0f, 0.0f, 1.0f); gl.glCallList(gear2); gl.glPopMatrix(); + // Place the third gear and call its display list gl.glPushMatrix(); gl.glTranslatef(-3.1f, 4.2f, 0.0f); gl.glRotatef(-2.0f * angle - 25.0f, 0.0f, 0.0f, 1.0f); gl.glCallList(gear3); gl.glPopMatrix(); + // Remember that every push needs a pop; this one is paired with + // rotating the entire gear assembly gl.glPopMatrix(); } |