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Index › Programming Questions & Help › Syntax Questions › scale an image ¿

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scale an image ?¿ (Read 596 times)

novato

scale an image ?¿
Mar 6^th, 2006, 8:38pm

Hey, I have been trying the example with the name "sacale" (http://processing.org/learning/examples/scale.html).
I would like to do the same as the black square with an image. I know how to load it an include it in the code but when I execute the code, the image isn't in the center. It's because the coordenates of the image are the left-up corner an de image is inverted.... This is the code

float a = 0.0;
float s = 0.0;
PImage im;
void setup()
{
size(200,200);
noStroke();
rectMode(CENTER);
framerate(30);
}

void draw()
{
background(102);
im=loadImage("mole.gif");
a = a + 0.04;
s = cos(a)*2;

translate(width/2, height/2);
scale(s);
image(im, 0,0);
}

So I don't know if its posible to do what I want.

Thanks

uoou

Re: scale an image ?¿
Reply #1 - Mar 6^th, 2006, 9:01pm

I get the feeling there's a better way to do this, but this works...

Just make sure s is always positive, then, when it would be negative, shift the picture over to the left proportional to s:

float a = 0.0;
float s = 0.0;
PImage im;
void setup()
{
size(200,200);
noStroke();
rectMode(CENTER);
framerate(30);
}

void draw()
{
background(102);
im=loadImage("mole.gif");
a = a + 0.04;
s = cos(a)*2;
if (s<0) {
s *= -1;
translate(-im.width*s,0);
}
translate(width/2, height/2);
scale(s);
image(im, 0,0);
}

uoou

Re: scale an image ?¿
Reply #2 - Mar 6^th, 2006, 9:08pm

Oh, if you want it centred like in the example:

float a = 0.0;
float s = 0.0;
PImage im;
void setup()
{
size(200,200);
noStroke();
rectMode(CENTER);
framerate(30);
}

void draw()
{
background(102);
im=loadImage("mole.gif");
a = a + 0.04;
s = cos(a)*2;
if (s<0) {
s *= -1;
}
translate((width/2)-((im.width*s)/2), height/2-((im.height*s)/2));
scale(s);
image(im, 0,0);
}

uoou

Re: scale an image ?¿
Reply #3 - Mar 6^th, 2006, 9:10pm

I knew there was a simpler way.

float a = 0.0;
float s = 0.0;
PImage im;
void setup()
{
size(200,200);
noStroke();
rectMode(CENTER);
framerate(30);
}

void draw()
{
background(102);
im=loadImage("mole.gif");
a = a + 0.04;
s = cos(a)+1;
translate((width/2)-((im.width*s)/2), height/2-((im.height*s)/2));
scale(s);
println(s);
image(im, 0,0);
}

uoou

Re: scale an image ?¿
Reply #4 - Mar 6^th, 2006, 9:39pm

This is nicer cos it keeps the same phase: (I'll stop playing with it now)

float a = 0.0;
float s = 0.0;
PImage im;
void setup()
{
size(200,200);
noStroke();
rectMode(CENTER);
framerate(30);
}

void draw()
{
background(102);
im=loadImage("mole.gif");
a = a + 0.04;
s = cos(a)*cos(a);
translate((width/2)-((im.width*s)/2), height/2-((im.height*s)/2));
scale(s);
println(s);
image(im, 0,0);
}

novato YaBB Newbies Offline Posts: 2	Re: scale an image ?¿ Reply #5 - Mar 6^th, 2006, 11:03pm ejjejej Thanks. Nice, very nice

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