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Index › Programming Questions & Help › Syntax Questions › scale and translate

stier4 YaBB Newbies Offline Posts: 16	scale and translate Apr 9th, 2008, 1:52pm   hey, when i scale images they r always scaledm anchored to the top left corner, can i change the scale mode to center or something? if not if i scale an image by the factor "n", how must the correct translate function with "n" as a parameter be called to have the image grow to its center?

koogy God Member Offline Posts: 788	Re: scale and translate Reply #1 - Apr 9th, 2008, 4:34pm   translate the image so its centre is at the origin before scaling. (and move it back afterwards)

V Senior Member Offline Posts: 430 portugal	Re: scale and translate Reply #2 - Apr 9th, 2008, 5:57pm   p3d/opengl:  pushMatrix();  translate( posx, posy );  scale( scaleFactor );  image( img, 0, 0 );  popMatrix();  posx = (width/2) - ((img.width/2)*scaleFactor);  posy = (height/2) - ((img.height/2)*scaleFactor); and like koogs said, its important to do scaling *After* translation
	Victor Martins | www.pixelnerve.com/v

stier4 YaBB Newbies Offline Posts: 16

Re: scale and translate Reply #3 - Apr 9th, 2008, 6:11pm   thank you, heres my code Quote: PImage img; float v = 1.0; float inc = 0.005; void setup(){  size(400,400);  background(255);  img = loadImage("1.gif"); } void draw(){  float n = noise(v) * 2.5; fill(255,5); rect(0,0,width,height); tint(0,255-n*100,n*100,255);  //from here translate(mouseX,mouseY); translate(-n*img.width/2,-n*img.height/2); scale(n); image(img,0,0);  //to here v += inc; }