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Index › Programming Questions & Help › Syntax Questions › How to display images
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How to display images (Read 589 times)
harai34
How to display images
Dec 18th, 2008, 7:01pm  
My idea is to display a certain image when key pressed for few seconds. An image shows up when key pressed, but it disappears right away. Is there any way to display the images for 3~4 seconds?

PImage city,c1,c2,c3,c4;
void setup() {
 
 size(600, 400);
 city = loadImage("city.jpg");
 c1=loadImage("c1.jpg");
 c2=loadImage("c2.jpg");
 c3=loadImage("c3.jpg");
 c4=loadImage("c4.jpg");
}
void draw() {
 background(city);
}
void keyPressed() {
  int ch = int(random(4));
   
  switch(ch){
    case 1:
      background(c1);
      break;
     
    case 2:
      background(c2);
      break;
    case 3:
      background(c3);
      break;
    case 4:
      background(c4);
      break;
  }
  //background(city);
}
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antiplastik
Re: How to display images
Reply #1 - Dec 18th, 2008, 7:51pm  
using something like a decreasing counter might help. and by the way, you should be thinking of using arrays instead of variables like c1, c2, c3, etc.

Quote:
// your own image class
class MyImage {

 PImage img; // the image to display
 int counter; // the counter

   // constructor : setting the image being passed
 MyImage(PImage img) {
   this.img = img;
 }

}

PImage city; // background image
MyImage[] c; // more background images stored in an array

void setup() {

 size(600, 400);
 city = loadImage("city.jpg");

 // set up the array
 c = new MyImage[4];

 // load each image into the array (c0.jpg, c1.jpg, c2.jpg, c3.jpg)
 for (int i = 0; i < 4; i++) {
   c[i] = new MyImage(loadImage("c" + i + ".jpg"));
 }

}

void draw() {

 background(city);

 // for each image in the array
 for (int i = 0; i < 4; i++) {
   // if its counter is positive, display it on screen
   if (c[i].counter > 0) {
     background(c[i].img);
   }
   // decrease the counter if above zero
   if (c[i].counter > 0) c[i].counter--;
 }
}

void keyPressed() {
 // choose a random image
 int i = int(random(4));
 // set up the counter to 20 frames
 // which means the image will be displayed 20 frames
 // and will disappear
 c[i].counter = 20;
}
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