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Index › Programming Questions & Help › Syntax Questions › rotate around center || and why does it leave th..
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rotate around center || and why does it leave th.. (Read 1013 times)
clankill3r
rotate around center || and why does it leave th..
Apr 15th, 2009, 11:01am  
I'm loading pixels from a webcam and I set them in a 3d space where the
red = x
green = y
blue = z axis, so basicly it should stay within a 255, 255, 255 area right?
For some reason it fills a bigger area, on the screen the setup size is 350, 350, P3D. As you can see it leaves the edges, how does this become?

...
(hsb goes even worse of the screen)

Also I want to rotate it from the center point, not the top corner, how can I do that?
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clankill3r
Re: rotate around center || and why does it leave th..
Reply #1 - Apr 15th, 2009, 11:44am  
maybe code helps...

Code:
import processing.video.*;

Capture cam;

String mode = "HSB"; 

void setup(){
  size(350, 350, P3D);

  cam = new Capture(this, 320, 240);
}


void draw() {
  background(204);
  if (cam.available() == true) {
    cam.read();
    //image(cam, 0, 0); //set(160, 100, cam);

    translate(50, 50, 50);

    for (int i = 0; i < cam.pixels.length; i++){
	if (mode == "RGB"){
	  stroke(color(cam.pixels[i]));
	  point(red(cam.pixels[i]), green(cam.pixels[i]), blue(cam.pixels[i]));
	}
	else if(mode == "HSB"){
	  stroke(color(cam.pixels[i]));
	  point(hue(cam.pixels[i]), saturation(cam.pixels[i]), brightness(cam.pixels[i]));
	  
	}

    }
  }
  if (frameCount % 15 == 0){
     saveFrame(); 
  }
}
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Cedric
Re: rotate around center || and why does it leave th..
Reply #2 - Apr 15th, 2009, 12:45pm  
Dont know how its supposed to look like but looks good to me if i change the 50,50,50 to     translate(0, 0, -100);
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clankill3r
Re: rotate around center || and why does it leave th..
Reply #3 - Apr 15th, 2009, 12:55pm  
yeah that helps, thx dude

and for the rotation, someone?
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Cedric
Re: rotate around center || and why does it leave th..
Reply #4 - Apr 15th, 2009, 12:59pm  
didnt see that. how do you want to rotate it. by mouse input? or just once within the sketch?
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clankill3r
Re: rotate around center || and why does it leave th..
Reply #5 - Apr 15th, 2009, 1:19pm  
I didn't expect you to want answer both Smiley

mouse input so I can move my mouse to rotate around the center of it.
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Cedric
Re: rotate around center || and why does it leave th..
Reply #6 - Apr 15th, 2009, 1:50pm  
far away from perfect... but i added a rotation effekt...

maybe you get a better effect by using peasy cam:
http://mrfeinberg.com/peasycam/



Code:

import processing.video.*;
Capture cam;

String mode = "RGB"; 
float rx,ry;
void setup(){
  size(350, 350, P3D);



  cam = new Capture(this, 320, 240);
}


void draw() {
  background(204);
  translate( 0,   0, -100);

 
    rx+=((width/2-mouseX)*0.01f-rx)*0.1f;
    ry+=((height/2-mouseY)*0.01f-ry)*0.1f;
   rotateY(rx);
    rotateX(ry);



  if (cam.available() == true) {
    cam.read();
    //image(cam, 0, 0); //set(160, 100, cam);

    
strokeWeight(3);
    for (int i = 0; i < cam.pixels.length; i++){
	if (mode == "RGB"){
	  stroke(color(cam.pixels[i]));
	  point(red(cam.pixels[i]), green(cam.pixels[i]), blue(cam.pixels[i]));
	}
	else if(mode == "HSB"){
	  stroke(color(cam.pixels[i]));
	  point(hue(cam.pixels[i]), saturation(cam.pixels[i]), brightness(cam.pixels[i]));
	  
	}

    }
  }
  if (frameCount % 15 == 0){
     saveFrame(); 
  }
  translate(width/2,height/2);
}
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clankill3r
Re: rotate around center || and why does it leave th..
Reply #7 - Apr 15th, 2009, 2:16pm  
your code rotates around left top of the color object, but thx anyway.

The peasy cam is nice maybe I look for implention later, if someone else can give a simpler solution a try then that would be nice.
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Cedric
Re: rotate around center || and why does it leave th..
Reply #8 - Apr 15th, 2009, 2:27pm  
you are right... i guess you came up with this solution yourself Smiley
i will take another look at it later.
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NoahBuddy
Re: rotate around center || and why does it leave th..
Reply #9 - Apr 15th, 2009, 2:41pm  
To rotate around center, could you subtract 128 from each of your RGB values?
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Cedric
Re: rotate around center || and why does it leave th..
Reply #10 - Apr 15th, 2009, 2:52pm  
Alright, here we go :

import processing.video.*;
Capture cam;

String mode = "RGB";
float rx,ry;

void setup(){

 size(350, 350, P3D);
rectMode(CENTER);
 noFill();

 cam = new Capture(this, 320, 240);
}


void draw() {
 background(204);


 pushMatrix();
 translate(width/2, height/2, 0);

 rotateX( radians(mouseY));
 rotateY( radians(mouseX));
 box(250);

translate( -125,   -125, -125);
 if (cam.available() == true) {
   cam.read();
   //image(cam, 0, 0); //set(160, 100, cam);

   
strokeWeight(3);
   for (int i = 0; i < cam.pixels.length; i++){
     if (mode == "RGB"){
       stroke(color(cam.pixels[i]));
       point(red(cam.pixels[i]), green(cam.pixels[i]), blue(cam.pixels[i]));
     }
     else if(mode == "HSB"){
       stroke(color(cam.pixels[i]));
       point(hue(cam.pixels[i]), saturation(cam.pixels[i]), brightness(cam.pixels[i]));
       
     }

   }
 }
 if (frameCount % 15 == 0){
    saveFrame();
 }

 popMatrix();
}

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clankill3r
Re: rotate around center || and why does it leave th..
Reply #11 - Apr 15th, 2009, 2:55pm  
yeah thx, that works great Smiley

for who's intrested, this works great for rotation then:

       rotateY(map(mouseX, 0, width, -PI, PI));
       rotateX(map(mouseY, 0, height, PI, -PI));

edit:

cederic, I saw your post after I posted, thx specially seing the box is helpfull.

edit2:

why is it getting so slow with another strokeweight then default?
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