PHP等距立方体与GD

问题描述

我需要使用PHP和GD创建类似的东西：

I need to create something like this with PHP and GD:

三个可见面将是同一图像的三个部分，我知道其中的坐标。

The three visible faces will be three parts of the same image, of which I know the coordinates.

我想这可以通过图像变换和一些数学来完成。

I suppose that this can be done with image transformations and some maths.

立方体的旋转将始终相同。

The rotation of the cube will be always the same.

我不需要像图片中那样的笔触边缘和面部照明，我只需要一个无阴影立方体。

I don't need "stroke" edges and face lighting like in that picture, I just need a "shadeless" cube.

最后，结果应该是透明的PNG。

Finally, the result should be an alpha-transparent PNG.

PS我的主机上只有GD，没有访问ImageMagick的权限。

P.S. I only have GD on my host, I don't have access to ImageMagick.

推荐答案

您正在搜索类似的内容吗？

you are searching for something like this?

<?php
$size=100;

$first_poligon = array(
            0,  $size/4,  // Point 1 (x, y) ---->  0,20
            $size/2,  $size/2, // Point 2 (x, y) ---->  50,50
            $size/2,  $size,    // Point 3 (x, y) ---->  50,100
            0, ($size/4)*3,  // Point 4 (x, y) ---->  0,60
            );
$second_poligon = array(
            0,  $size/4,  // Point 1 (x, y) ---->  0,33
            $size/2,  0, // Point 2 (x, y) ---->  50,0
            $size,  $size/4,    // Point 3 (x, y) ---->  100,20
            $size/2,  $size/2,  // Point 4 (x, y) ---->  50,50
            );
$third_poligon = array(
            $size,  $size/4,  // Point 1 (x, y) ---->  100,20
            $size/2,  $size/2, // Point 2 (x, y) ---->  50,50
            $size/2,  $size,    // Point 3 (x, y) ---->  50,100
            $size, ($size/4)*3,  // Point 4 (x, y) ---->  100,60
            );

$im = imagecreatetruecolor($size, $size);

$fondo   = imagecolorallocate($im, 51, 0, 0);
imagefilledrectangle($im, 0, 0, $size, $size, $fondo);

$blue = imagecolorallocate($im, 0, 0, 255);
$white = imagecolorallocate($im, 255, 255, 255);
$red = imagecolorallocate($im, 255, 0, 0);

imagefilledpolygon($im, $first_poligon, 4, $blue);
imagefilledpolygon($im, $second_poligon, 4, $white);
imagefilledpolygon($im, $third_poligon, 4, $red);

imagepng($im, './image.png');

imagedestroy($im);
?>
 <img src="image.png" >

图片结果：

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