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Index › Programming Questions & Help › Syntax Questions › simple image rotation
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simple image rotation (Read 454 times)
cleanzero
simple image rotation
Apr 27th, 2006, 10:47pm  
Hi, i'm just starting to learn processing (there should be a dummies/beginners sectione in this forum). I want to continously rotate the image ( i suppose there's no built-in rotate method, or yes?) but the code below draws just one rotation. What's wrong?
Thanks.


PImage img;
TransImage timage;
int currentImage;
private PImage temp;

class TransImage{
 PImage theImage;
 int w,h;
 
 public TransImage(PImage image){
   theImage=image;
   w=theImage.width;
   h=theImage.height;
   temp=new PImage(w,h);

 }
 void rotate(float angle){
   int xt,yt;
   int x,y;
   loadPixels();
   for(x=0;x<w*h;++x){
   temp.pixels[x]=theImage.pixels[x];
   }
   angle=-(angle*3.14)/180.0;
    for(x=0;x<h;++x)
   for(y=0;y<w;++y){
     xt=(int)((x-h/2)*cos(angle)+(y-w/2)*sin(angle));
     yt=(int)(-(x-h/2)*sin(angle)+(y-w/2)*cos(angle));
     xt=xt+h/2;
     yt=yt+w/2;
     if(xt>(h-1))   theImage.pixels[x*w+y]=color(0,0,0);
     else
     if(yt>(w-1)) theImage.pixels[x*w+y]=color(0,0,0);
     else
     if(xt<0) theImage.pixels[x*w+y]=color(0,0,0);
     else
     if(yt<0) theImage.pixels[x*w+y]=color(0,0,0);
     else
     theImage.pixels[x*w+y]=temp.pixels[xt*w+yt];
   }
    updatePixels();
   
 }
 
 public PImage getImage(){
   return theImage;
 }
}

void setup(){
 img=loadImage("clouds1.jpg");
 timage=new TransImage(img);
 size(256,256);
 background(0);
}

void draw(){
 background(0);
 timage.rotate((float)(frameCount%360));
 image(timage.getImage(),0,0);
 
 
}
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JohnG
Re: simple image rotation
Reply #1 - Apr 27th, 2006, 11:05pm  
This should do what you want, without having to write your own functions Smiley

Code:
PImage img; 

void setup()
{
 size(256,256);
 img=loadImage("clouds1.jpg"); 
}

void draw()
{
  background(0);
  translate(width/2,height/2);
  rotate(frameCount/360.0*TWO_PI);
  translate(-img.width/2,-img.height/2);
  image(img);
}
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cleanzero
Re: simple image rotation
Reply #2 - Apr 27th, 2006, 11:25pm  
I suspected that!!! Where are they documented???
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mflux
Re: simple image rotation
Reply #3 - Apr 27th, 2006, 11:42pm  
http://processing.org/reference/index_ext.html


Theres a menu at the top of this web page. Click Reference.

Also, you can view reference directly from Processing. It opens up the same info Smiley
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