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Index › Programming Questions & Help › Syntax Questions › making ellipse assume the color from image
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making ellipse assume the color from image (Read 521 times)
brt
making ellipse assume the color from image
Jun 8th, 2009, 7:14am  
hey! im trying to  make an ellipse assume the color from an  image on its x and y position. the x and y are random and the get() does'nt accept floats so i tried to increment an int of 0 with a float but i don't seem to be getting anywhere... can someone help me?

here's my code Code:
import processing.pdf.*;

int x = 0;
int y = 0;
void setup(){
 size(595,842);
 beginRecord(PDF, "cartaz.pdf");
 smooth();
 background(0);
  PImage myImage = loadImage("Imagem.jpg");
image(myImage, 0, 0);
  

}

void draw(){
  
  
stroke(10);

  float xpos = random(width);
  float ypos = random(height); 
  color pixelColor = get(x,y);
  fill(pixelColor);
  float prop = random(20);

  ellipse(xpos,ypos,prop,prop);
  
  x += xpos;
  y += ypos;
  println(xpos);
  
  if(mousePressed){
    endRecord();
    exit();
  }
}
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Iang
Re: making ellipse assume the color from image
Reply #1 - Jun 8th, 2009, 7:58am  
You are incrementing x and y at random values. Eventually you will go out of bounds of the image.

Try this (psuedo code) where img is your image variable

int x = random(img.width,img.height)
int y = random(img.width,img.height)
color col = img.get(x,y)

fill(col)

ellipse(x,y,2,2)
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brt
Re: making ellipse assume the color from image
Reply #2 - Jun 8th, 2009, 8:04am  
its not possible because int cant support random, only float can..
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PhiLho 
Re: making ellipse assume the color from image
Reply #3 - Jun 8th, 2009, 8:06am  
Look at float() and int() functions to convert between these two types.
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WWW  
Iang
Re: making ellipse assume the color from image
Reply #4 - Jun 8th, 2009, 10:30am  
Here we go, I was in a bit of a rush earlier so it was slightly incorrect

as PhiLho mentioned, you need to cast the return value of random to an int with int()

Code:
PImage img;

void setup()
{
  size(500,500);
  img = loadImage("flower.jpg");  
  noStroke();
}

void draw()
{
  for(int i = 0; i < 100; i++)
  {
  int x = (int)random(img.width);
  int y = (int)random(img.height);
  color col = img.get(x,y);
  fill(col);
  ellipse(x,y,2,2);
  }
}


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brt
Re: making ellipse assume the color from image
Reply #5 - Jun 8th, 2009, 1:06pm  
thanksss!
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