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08/12/2005 at 09:14AM PDT, ID: 21525396
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7.8

Pixel drawing...efficient way of seeing if a pixel is drawn

Asked by RandalBarnes in PHP Scripting Language

Tags: pixel

Hello. I am making an html calendar program with css absolute positioning. When I draw an object on the calendar, I want to be able to know which pixels were drawn.

The following code is what I had come up with at first, to make an array of pixels:

$screen = array(array());

for($x=0;$x<700;$x++)
{
    for($y=0;$y<500;$y++)
    {
        $screen[$x][$y] = 0;
    }
}

Then I would set the x,y with the pixel for each object that I draw. Problem is, I think this would be too slow and inefficient. It doesn't even load because of the error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 35 bytes).

What I want is to draw an object like this:

|------------|
|------------|
|------------|

Let's say I drew that at left: 10px, top: 50px, width: 30px; height: 20px;

And I want to check to see if these pixels are drawn

(17,55) // should return true
(5,5) // should return false

So basically I want some kind of function like this:

isPixelSet($x,$y,&$screen)
{
    //find out if pixel is set here
    return true;
    //or
    return false;
}

and something like this

setPixelRange($top,$left,$width,$height,&$screen)
{
    // i have no idea how to do this
}
[+][-]08/12/05 09:20 AM, ID: 14662201

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[+][-]08/12/05 09:24 AM, ID: 14662228

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[+][-]08/12/05 09:59 AM, ID: 14662584

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About this solution

Zone: PHP Scripting Language
Tags: pixel
Sign Up Now!
Solution Provided By: missilesilo
Participating Experts: 2
Solution Grade: A
 
 
[+][-]08/12/05 11:28 AM, ID: 14663413

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[+][-]08/12/05 12:59 PM, ID: 14664222

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