CODEWITHSUNDEEP
javarandomcolors
Sugar Spice
Sugar Spice

Reputation: 107

How to randomize colors except black?

This line
g.setColor(new Color(numGen.nextInt(256), numGen.nextInt(256), numGen.nextInt(256)));
generates a random color but I don't want to include black in it for some reason. Can I restrict values for example, just 80-256 to exclude the dark colors. I tried Math.random and do modulo but it doesn't work. Please help me. Thank you very much!

Upvotes: 0

Views: 1068

Answers (3)

hagensoft
hagensoft

Reputation: 1507

to generate numbers between 80-256:

css..

table {
    font: 11px/24px Verdana, Arial, Helvetica, sans-serif;
    border-collapse: collapse;
    width: 320px;
    }

td {
    border: 1px solid #CCC;
    padding: 0 0.5em;
    }

html....

<head>        
</head>
<body>
    <div id='mydiv'></div>
    <button id = "myRandomizeBtn">Randomize</button> 
</body>

javascript...

$("#myRandomizeBtn").bind("click",randomizeHandler); 

function randomizeHandler(evt){     
var root=document.getElementById('mydiv');
var tab=document.createElement('table');
tab.className="mytable";
var tbo=document.createElement('tbody');
var row, cell;
var n = 3;  
var data;    

for (i=0; i<n; i++)
{
    row=document.createElement('tr');
    for(var j=0;j<n;j++){
        cell=document.createElement('td');
        data = Math.floor(80+(176*Math.random())); 
        cell.appendChild(document.createTextNode(data));
        row.appendChild(cell);
    }
    tbo.appendChild(row);
}
tab.appendChild(tbo);
root.appendChild(tab);
   }

here's a link to jsfiddle... hope it helps... http://jsfiddle.net/FhyHK/

Upvotes: 1

Roger Lindsj&#246;
Roger Lindsj&#246;

Reputation: 11543

If you want the to offset the number randomize in a smaller range and add the offset.

private int randomBetween(int min, int max) {
    int range = max - min;
    return min + numGen.nextInt(range);
}

...

g.setColor(new Color(randomBetween(80,256), randomBetween(80,256), randomBetween(80,256)));

This assumes you want a minimum intensity for each color component.

Upvotes: 2

Andrew Thompson
Andrew Thompson

Reputation: 168825

g.setColor(
  new Color(127 + numGen.nextInt(128), 
  new Color(127 + numGen.nextInt(128), 
  new Color(127 + numGen.nextInt(128));

Upvotes: 1

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