Processing 1.0 - Processing Discourse - PLEASE HELP! rotating question

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Index › Programming Questions & Help › Syntax Questions › PLEASE HELP! rotating question

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PLEASE HELP! rotating question (Read 225 times)

mishka

PLEASE HELP! rotating question
Mar 4^th, 2009, 9:55pm

Hi! I am playing around with processing for the first time and I'm getting stuck. I have this code that draws multiple squares from the center.

Here is what I have,

int i = 50;

void setup()
{
size(300, 300);
smooth();
background(224);
noLoop();
}

void draw()
{
for(int i=15;i<300; i += x) {
noFill();
stroke(254,243,75);
rectMode(CENTER);
rect(150, 150, i, i);
}
}

Now I'm trying to repeat those same squares at a 45 degree angle and without translation. Is this possible? And how do I do it?

Any help would be greatly appreciated

Thanks

« Last Edit: Mar 10^th, 2009, 1:08pm by N/A »

mishka Ex Member	Re: basic question but need help. ROTATING Reply #1 - Mar 4^th, 2009, 9:57pm I just noticed that at the top of the code it is missing int x=15

cloister

Re: basic question but need help. ROTATING
Reply #2 - Mar 4^th, 2009, 10:43pm

I'm not clear on what you mean "and without translation."

Do you mean you want to do it without using the Processing "translate()" function?

Do you mean you want sets of rotated squares where a rotated square is centered on its corresponding unrotated (or less rotated) squares?

I'm not positive what you want, but looking at your code you should wrap the for() loop that draws the squares with the following:

translate(150,150);
for(angle = 0; angle <= 45; angle += 45) {

// your for() loop goes here, except you change the rect call to "rect(0,0,i,i);"

}

Also note that you can pull the call to stroke() out of all the loops (put it up in setup()) because it is persistent to all subsequent drawing commands, until replaced by a call to stroke() with different values.

mishka

Re: basic question but need help. ROTATING
Reply #3 - Mar 10^th, 2009, 2:13am

I am still having trouble with this so if anyone could lend a helping hand, it would be greatly appreciated.

I want to set of squares, the second set of rotated squares would be just a 45 degree rotation and centered on its corresponding unrotated squares. And I also want the two different sets to be different colours. Can this be done? And what am I doing wrong?

float x = 15;
int i = 50;

void setup()
{
size(300, 300);
smooth();
background(224);
noLoop();
}

void drawFirst(){
for(int i=15;i<300; i += x) {
noFill();
stroke(254,243,75);
rectMode(CENTER);
rect(150, 150, i, i);
}
}

void draw(){
translate(150,150);
rotate(angle = 0; angle <= 45; angle += 45);
for(int i=15;i<300; i += x) {
noFill();
stroke(254,243,75+x);
rectMode(CENTER);
rect(0, 0, i, i);
}
}

PhiLho

Re: PLEASE HELP! rotating question
Reply #4 - Mar 10^th, 2009, 1:24pm

cloister was right (of course).
Corrected code:
Code:

float x = 15;
int i = 50;  
 
void setup()  
{  
  size(300, 300);  
  smooth();  
  background(224);  
  noFill();  
  rectMode(CENTER);  
  translate(width/2, height/2);
  stroke(254, 243, 75);  
  drawRectangles();  
  rotate(QUARTER_PI); // 45°
  stroke(254, 200, 175);  
  drawRectangles();  
}  
 
 
void drawRectangles() {    
  for(int i = 15; i < 300; i += x) {  
     rect(0, 0, i, i);  
  }
}

mishka Ex Member	Re: PLEASE HELP! rotating question Reply #5 - Mar 10^th, 2009, 1:56pm Thank you! Thank you! Thank you! Thank you! Thank you! This programming stuff has been so difficult for me to grasp I really appreciate your help!!

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