用php随机生成颜色

时间:2013-04-10 15:35:39

标签: php colors

所以我每天都在努力改变标题,我试图用随机颜色创建它。标题中有2种颜色,我正在制作免费颜色。第一种颜色是随机生成的,然后第二种颜色通过改变色调150°来修改。问题是当选择某些颜色时,它们可能太生气或太暗。我有一个检查运行,以便我可以稍微控制亮度值,但仍然有一些太亮的颜色(例如极端黄色)。我在下面发布我的代码。任何帮助或建议表示赞赏!谢谢!

// grab a random color on hue 
$h = rand(0,360);

// color values 50-120 tend to be extremely bright, 
// make adjustments to the S and L accordingly
// a better solution is available?
if ($h > 50 && $h < 120) {
    $s = rand(60,80);
    $l = rand(30,50);
} else {
    $s = rand(60,90);
    $l = rand(38,63);
}

// declare string to place as css in file for primary color           
$randomColor = "hsl(". $h .",". $s ."%,". $l ."%)";

// declare degree for secondary color (30 = analogous, 150 = complimentary)
$degree = 150;

// point to secondary color randomly on either side of chart        
$bool = rand(0,1);
if ($bool) {
    $x = $degree;
} else {
    $x = -$degree;
} 

// set value of the new hue
$nh = $h + $degree;

// if the new hue is above 360 or below 0, make adjustments accordingly
if ($nh > 360) {
    $nh -= 360;
}
if ($nh < 0 ) {
    $nh = 360 - $nh;
}

// set the secondary color
$secondaryColor = "hsl(". abs($h + $x) .",". $s ."%,". $l ."%)";

这看起来非常简单,我确信有更好的方法。我环顾四周,但我注意到的是基本配方的色度等等。再次感谢!

1 个答案:

答案 0 :(得分:1)

这更像是一个你认为可以接受观看的颜色的问题。这当然不是一个最佳的解决方案,但它至少是可读的方法(如果你甚至关心它,它也会比你原来的稍微更随机):

function randColor() {
    return array( rand(0,360), rand(0,100), rand(0,100) );
}

function isAcceptableColor($colorArr) {
    // return true if the color meets your criteria
}

do {
    $color = randColor();
} while ( ! isAcceptableColor($color) );