應儘可能簡單:
$ratio = 200/300;
$width = mt_rand(100, 250);
$height = round($width/$ratio);
看一些例子:
$ratio = 200/300;
echo "base aspect ratio: ", round($ratio, 2), "\n\n";
foreach(range(1,10) as $_) {
$width = mt_rand(100, 250);
$height = round($width/$ratio);
echo "http://placekitten.com/{$width}/{$height}\n";
echo "aspect ratio: ", round($width/$height, 2), "\n\n";
}
輸出
base aspect ratio: 0.67
http://placekitten.com/229/344
aspect ratio: 0.67
http://placekitten.com/112/168
aspect ratio: 0.67
http://placekitten.com/241/362
aspect ratio: 0.67
http://placekitten.com/223/335
aspect ratio: 0.67
http://placekitten.com/196/294
aspect ratio: 0.67
http://placekitten.com/234/351
aspect ratio: 0.67
http://placekitten.com/116/174
aspect ratio: 0.67
http://placekitten.com/157/236
aspect ratio: 0.67
http://placekitten.com/165/248
aspect ratio: 0.67
http://placekitten.com/114/171
aspect ratio: 0.67
如何確定寬高比?我認爲placekitten可以採取你提供的任何規模,並相應地進行縮放/裁剪。您的意圖是指定圖像大小以適應您的設計模型需要。 – 2013-02-21 00:57:39
什麼意思是「基於隨機寬度的適當寬高比」?你要找的長寬比是多少? – Pete 2013-02-21 00:58:47
如果應該計算高度,爲什麼它必須在url中? – bitWorking 2013-02-21 00:58:51