在PHP中基于字母生成颜色
我如何根据字符串的起始字母生成颜色——也许a可以是蓝色,Z可以是绿色,而其他字母则是介于两者之间逐渐变化的光谱 试试这个功能:在PHP中基于字母生成颜色,php,colors,Php,Colors,我如何根据字符串的起始字母生成颜色——也许a可以是蓝色,Z可以是绿色,而其他字母则是介于两者之间逐渐变化的光谱 试试这个功能: 这将以弧度为单位显示色调。然后,只需选择一个特定的饱和度和亮度,然后转换为RGB或其他颜色。请参阅。您肯定会想使用HSV,因为在该空间中从一种色调平滑过渡到另一种色调是很简单的 也许不是世界上最有效的代码,但这里是。当然,在代码的底部有一个小测试页,您可以删除/忽略它 <?php // RGB_TO_HSV copied from http://www.a
这将以弧度为单位显示色调。然后,只需选择一个特定的饱和度和亮度,然后转换为RGB或其他颜色。请参阅。您肯定会想使用HSV,因为在该空间中从一种色调平滑过渡到另一种色调是很简单的 也许不是世界上最有效的代码,但这里是。当然,在代码的底部有一个小测试页,您可以删除/忽略它
<?php
// RGB_TO_HSV copied from http://www.actionscript.org/forums/showthread.php3?t=50746
function HSV_TO_RGB ($H, $S, $V) // HSV Values:Number 0-1
{ // RGB Results:Number 0-255
$RGB = array();
if($S == 0)
{
$R = $G = $B = $V * 255;
}
else
{
$var_H = $H * 6;
$var_i = floor( $var_H );
$var_1 = $V * ( 1 - $S );
$var_2 = $V * ( 1 - $S * ( $var_H - $var_i ) );
$var_3 = $V * ( 1 - $S * (1 - ( $var_H - $var_i ) ) );
if ($var_i == 0) { $var_R = $V ; $var_G = $var_3 ; $var_B = $var_1 ; }
else if ($var_i == 1) { $var_R = $var_2 ; $var_G = $V ; $var_B = $var_1 ; }
else if ($var_i == 2) { $var_R = $var_1 ; $var_G = $V ; $var_B = $var_3 ; }
else if ($var_i == 3) { $var_R = $var_1 ; $var_G = $var_2 ; $var_B = $V ; }
else if ($var_i == 4) { $var_R = $var_3 ; $var_G = $var_1 ; $var_B = $V ; }
else { $var_R = $V ; $var_G = $var_1 ; $var_B = $var_2 ; }
$R = $var_R * 255;
$G = $var_G * 255;
$B = $var_B * 255;
}
$RGB['R'] = $R;
$RGB['G'] = $G;
$RGB['B'] = $B;
return $RGB;
}
function getColorForWord($word) {
// get the percent of the first letter ranging from 0-1
$first_letter_code = (ord(strtolower($word[0]))-97)/25.0;
// add a phase depending on where you want to start on the color spectrum
// red is 0, green is 0.25, cyan is 0.5, blue is ~0.75, and 1 is back to red
$hue = $first_letter_code + 0.25;
// you may also want to divide by how much of the spectrum you want to cover
// (making the colors range only from green to blue, for instance)
// but i'll leave that as an exercise
// constrain it to 0-1
if ($hue > 1.0)
$hue -= 1.0;
// the second value is the saturation ("colorfulness", ranging from gray to fully-colored)
// the third is the value (brightness)
$rgb = HSV_TO_RGB($hue, 1, 0.75);
$hexstring = "#";
foreach ($rgb as $c)
$hexstring .= str_pad(dechex($c), 2, "0", STR_PAD_LEFT);
return $hexstring;
}
?>
<html>
<head>
</head>
<body>
<form method="POST" action="<?=$_SERVER["PHP_SELF"]?>">
<input type="text" name="target_word" />
<?php
if ($_REQUEST["sub"] && $_REQUEST["target_word"] != "") {
print "<span style=\"font-weight: bold; color: ".getColorForWord($_REQUEST["target_word"]).";\">".$_REQUEST["target_word"]."</span>";
}
?>
<br />
<input type="submit" name="sub" value="Colorize" />
</form>
</body>
我会指定第一种颜色的RGB代码(100100100)和最后一种颜色的RGB代码(200200),基本上
1..25
B..Y
结果r=firstR+(lastR-firstR)*(1..25/26)
结果G=firstG+(lastG firstG)*(1..25/26)
结果B=firstB+(lastB firstB)*(1..25/26)
所以B会给出100+楼层((200-100)*(1/26))
104104
Y是100+层((200-100)*(1/26))
196
这是一个基本代码,但它将允许所有3种颜色的渐变,或者只允许1种颜色(例如100100100到100100200)向蓝色渐变基于将前六个字母字符(包括空格)转换为相关的十六进制字符的想法,我提出了这个更简单的解决方案。对于十六进制,有助于了解(例如#123456),如果更改1和2,它将在接近零的值处变得更蓝,在接近F的值处变得更白。如果更改3和4,它将在接近零的值处变得更品红色,对于F的值,白色会变多。如果你改变5和6,在接近0的值时,白色会变多,而对于F的值,白色会变多。做了这个之后,我还尝试使用类似的策略来计算互补颜色(适合背景)。但是十六进制的中间值很难变成灰色(7,8)
$word=“word 1”;
$letter=substr(strtolower($word),0,6);
$i=0;
$hd=“#””;
虽然($I您希望颜色是什么输出格式?CMYK、RGB、HSV、Hex……?最好是Hi、Hex或RGB,但我可能知道如何转换其他格式。根据字符串开头的字母生成颜色是什么意思。如果将a指定为蓝色,Z指定为绿色,则字母b到y将始终是从蓝色到绿色的渐变。这就是你想要的吗?
<?php
// RGB_TO_HSV copied from http://www.actionscript.org/forums/showthread.php3?t=50746
function HSV_TO_RGB ($H, $S, $V) // HSV Values:Number 0-1
{ // RGB Results:Number 0-255
$RGB = array();
if($S == 0)
{
$R = $G = $B = $V * 255;
}
else
{
$var_H = $H * 6;
$var_i = floor( $var_H );
$var_1 = $V * ( 1 - $S );
$var_2 = $V * ( 1 - $S * ( $var_H - $var_i ) );
$var_3 = $V * ( 1 - $S * (1 - ( $var_H - $var_i ) ) );
if ($var_i == 0) { $var_R = $V ; $var_G = $var_3 ; $var_B = $var_1 ; }
else if ($var_i == 1) { $var_R = $var_2 ; $var_G = $V ; $var_B = $var_1 ; }
else if ($var_i == 2) { $var_R = $var_1 ; $var_G = $V ; $var_B = $var_3 ; }
else if ($var_i == 3) { $var_R = $var_1 ; $var_G = $var_2 ; $var_B = $V ; }
else if ($var_i == 4) { $var_R = $var_3 ; $var_G = $var_1 ; $var_B = $V ; }
else { $var_R = $V ; $var_G = $var_1 ; $var_B = $var_2 ; }
$R = $var_R * 255;
$G = $var_G * 255;
$B = $var_B * 255;
}
$RGB['R'] = $R;
$RGB['G'] = $G;
$RGB['B'] = $B;
return $RGB;
}
function getColorForWord($word) {
// get the percent of the first letter ranging from 0-1
$first_letter_code = (ord(strtolower($word[0]))-97)/25.0;
// add a phase depending on where you want to start on the color spectrum
// red is 0, green is 0.25, cyan is 0.5, blue is ~0.75, and 1 is back to red
$hue = $first_letter_code + 0.25;
// you may also want to divide by how much of the spectrum you want to cover
// (making the colors range only from green to blue, for instance)
// but i'll leave that as an exercise
// constrain it to 0-1
if ($hue > 1.0)
$hue -= 1.0;
// the second value is the saturation ("colorfulness", ranging from gray to fully-colored)
// the third is the value (brightness)
$rgb = HSV_TO_RGB($hue, 1, 0.75);
$hexstring = "#";
foreach ($rgb as $c)
$hexstring .= str_pad(dechex($c), 2, "0", STR_PAD_LEFT);
return $hexstring;
}
?>
<html>
<head>
</head>
<body>
<form method="POST" action="<?=$_SERVER["PHP_SELF"]?>">
<input type="text" name="target_word" />
<?php
if ($_REQUEST["sub"] && $_REQUEST["target_word"] != "") {
print "<span style=\"font-weight: bold; color: ".getColorForWord($_REQUEST["target_word"]).";\">".$_REQUEST["target_word"]."</span>";
}
?>
<br />
<input type="submit" name="sub" value="Colorize" />
</form>
</body>
$word="word 1";
$letter = substr(strtolower($word), 0,6);
$i=0;
$hd="#";
while ($i<=5){
$l2=substr($letter,$i,1);
if($l2=="a" || $l2=="b"){$hd=$hd."0";}
elseif($l2=="c" || $l2=="d"){$hd=$hd."1";}
elseif($l2=="e"){$hd=$hd."2";}
elseif($l2=="f" || $l2=="g"){$hd=$hd."3";}
elseif($l2=="h" || $l2=="i"){$hd=$hd."4";}
elseif($l2=="j"){$hd=$hd."5";}
elseif($l2=="k" || $l2=="l"){$hd=$hd."6";}
elseif($l2=="m" || $l2=="n"){$hd=$hd."7";}
elseif($l2=="o"){$hd=$hd."8";}
elseif($l2=="p" || $l2=="q"){$hd=$hd."9";}
elseif($l2=="r" || $l2=="s"){$hd=$hd."A";}
elseif($l2=="t"){$hd=$hd."B";}
elseif($l2=="u" || $l2=="v"){$hd=$hd."C";}
elseif($l2=="w" || $l2=="x"){$hd=$hd."D";}
elseif($l2=="y"){$hd=$hd."E";}
elseif($l2=="z" || $l2==" " || $l2==""){$hd=$hd."F";}
$i++;
}
//calculating the complimentary colour
$o=1;
$comp="#";
while($o<=6){
$see=substr($hd,$o,1);
if($see=="F"){$comp=$comp."0";}
elseif($see=="E"){$comp=$comp."1";}
elseif($see=="D"){$comp=$comp."2";}
elseif($see=="C"){$comp=$comp."3";}
elseif($see=="B"){$comp=$comp."4";}
elseif($see=="A"){$comp=$comp."5";}
elseif($see=="9"){$comp=$comp."F";}
elseif($see=="8"){$comp=$comp."0";}
elseif($see=="7"){$comp=$comp."F";}
elseif($see=="6"){$comp=$comp."0";}
elseif($see=="5"){$comp=$comp."F";}
elseif($see=="4"){$comp=$comp."B";}
elseif($see=="3"){$comp=$comp."C";}
elseif($see=="2"){$comp=$comp."D";}
elseif($see=="1"){$comp=$comp."E";}
elseif($see=="0"){$comp=$comp."F";}
$o++;
}
echo" hexadecimal is $hd, complimentary colour is $comp";