Zoom effect in OpenGL with Processing

Core Library Questions

fronter

Zoom effect in OpenGL with Processing

in Core Library Questions • 2 years ago

Is this possible?

I want a zoom effect on my scene and I`m wondering if it is a zoom code for OpenGL in processing. I still work on this project:

import processing.opengl.*;

float a;

void setup() {
size(200, 200, OPENGL);
fill(0);
noStroke();
}

void draw() {
background(900);
translate(width/2, height/2);
rotateX(a);
rotateY(a*5);
rotateX(PI/2);
rotateY(a*10);
rotateY(a*1);
rotate(a*5);
rotateY(a*1);
rotateY(a*10);

rect(20, 20, -20, 20); fill(sin(a)*100+178);
rect(20, 20, -20, 20); fill(sin(a)*200+300);
rect(50, 20, -20, 20); fill(sin(a)*100+100);
rect(20, 50, -20, 20); fill(sin(a)*100+100);

rect(-20, 20, -20, 20);
rect(-20, 20, -20, 20);fill(sin(a)*100+100);
rect(-50, 20, -20, 20);fill(sin(a)*100+100);
rect(-20, 50, -20, 20);

rect(-20, 20, -20, 20);fill(sin(a)*100+178);
rect(-20, 20, -20, 20);fill(sin(a)*200+300);
rect(-50, 20, -20, 20);fill(sin(a)*100+100);
rect(-20, 50, -20, 20);fill(sin(a)*100+100);

rect(20, 20, 20, -20);
rect(20, 20, 20, -20); fill(sin(a)*500+500);
rect(-50, 20, 20, -20); fill(sin(a)*500+500);
rect(20, 20, 20, -20);

a -= 0.01;
}

Thanks for any help :)

Replies(4)

tfguy44

Re: Zoom effect in OpenGL with Processing

2 years ago

import processing.opengl.*;
float a;
void setup() {
size(200, 200, OPENGL);
fill(0);
noStroke();
}
void draw() {
background(900);
translate(width/2, height/2);
rotateX(a);
rotateY(a*5);
rotateX(PI/2);
rotateY(a*10);
rotateY(a*1);
rotate(a*5);
rotateY(a*1);
rotateY(a*10);
scale( map( mouseX, 0, width, .1, 4 ));
rect(20, 20, -20, 20); fill(sin(a)*100+178);
rect(20, 20, -20, 20); fill(sin(a)*200+300);
rect(50, 20, -20, 20); fill(sin(a)*100+100);
rect(20, 50, -20, 20); fill(sin(a)*100+100);
rect(-20, 20, -20, 20);
rect(-20, 20, -20, 20);fill(sin(a)*100+100);
rect(-50, 20, -20, 20);fill(sin(a)*100+100);
rect(-20, 50, -20, 20);
rect(-20, 20, -20, 20);fill(sin(a)*100+178);
rect(-20, 20, -20, 20);fill(sin(a)*200+300);
rect(-50, 20, -20, 20);fill(sin(a)*100+100);
rect(-20, 50, -20, 20);fill(sin(a)*100+100);
rect(20, 20, 20, -20);
rect(20, 20, 20, -20); fill(sin(a)*500+500);
rect(-50, 20, 20, -20); fill(sin(a)*500+500);
rect(20, 20, 20, -20);
a -= 0.01;
}

fronter

Re: Zoom effect in OpenGL with Processing

2 years ago

Thanks!

But what if I want to let the object zoom in and out by it self in a proper order? And I have another question too, but that is a little off topic: I want to change other colors, not just black/white/grey. What do I need to write then?

tfguy44

Re: Zoom effect in OpenGL with Processing

2 years ago

Simply scale by whatever factor you like each time the object is drawn. Right now the scale factor is tied directly to the mouse's X position. See scale(): http://processing.org/reference/scale_.html

You can do all kinds of colors by specifying the red, green, and blue values. See fill(): http://processing.org/reference/fill_.html

fronter

Re: Zoom effect in OpenGL with Processing

2 years ago

Thanks for your knowlegde. You can follow my demo-scene projects on my site: http://www.frontermusic.com . It is in Norwegian, so you might have some trouble reading some of the letters if you are not from Norway. Thanks again :)

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