Hi all,
I have a problem I'm trying to figure out, so I thought
I would create a simple test example and post here.
The example draws 12 lines to create the outline of
a box, and it uses the mousewheel to zoom in and
out. I've included the source at the end of this
message, but I've also put an applet here:
bebop.cns.ualberta.ca/~cwant/zoom_test/
(website won't let me post a URL, so protocol stripped).
Why is an 'X' drawn when one zooms in close?
An alternate phrasing for this question:why do lines
flip when one scales by a large(ish) amount?
I'd appreciate any tips for detecting and avoiding
this behavior.
Cheers,
Chris
Quote:import java.awt.event.MouseWheelListener;
ZoomBox zoomBox;
void setup() {
size(500,600,P3D);
zoomBox = new ZoomBox();
}
void draw() {
zoomBox.draw();
}
class ZoomBox implements MouseWheelListener {
float zoom = 1.0;
float zoomFactor = 1.10;
ZoomBox(){
addMouseWheelListener(this);
}
void draw() {
background(255);
pushMatrix();
translate(width/2, height/2);
scale(zoom);
beginShape(LINES);
vertex(-100, -100, -100); vertex(-100, 100, -100);
vertex( 100, -100, -100); vertex( 100, 100, -100);
vertex(-100, -100, -100); vertex( 100, -100, -100);
vertex(-100, 100, -100); vertex( 100, 100, -100);
vertex(-100, -100, 100); vertex(-100, 100, 100);
vertex( 100, -100, 100); vertex( 100, 100, 100);
vertex(-100, -100, 100); vertex( 100, -100, 100);
vertex(-100, 100, 100); vertex( 100, 100, 100);
vertex(-100, -100, 100); vertex(-100, -100, -100);
vertex( 100, -100, 100); vertex( 100, -100, -100);
vertex(-100, 100, 100); vertex(-100, 100, -100);
vertex( 100, 100, 100); vertex( 100, 100, -100);
endShape();
popMatrix();
}
void mouseWheelMoved(java.awt.event.MouseWheelEvent e) {
int notches = e.getWheelRotation();
if (notches < 0) {
zoom *= zoomFactor;
}
else {
zoom /= zoomFactor;
}
println(zoom);
}
}
Pages: 1
Scaling + lines == flipping (Read 543 times)