Question

我已将一张图片（已调整大小的图片）添加到画布＆amp;应用比例和旋转操作。画布宽度为380像素，高度为217.143像素。

案例1）。应用仅缩放后的Json：

[{"objects":[{"type":"image","originX":"left","originY":"top","left":-39,"top":-62.76,"width":1000,"height":667,"fill":"rgb(0,0,0)","stroke":null,"strokeWidth":0,"strokeDashArray":null,"strokeLineCap":"butt","strokeLineJoin":"miter","strokeMiterLimit":10,"scaleX":0.83,"scaleY":0.83,"angle":0,"flipX":false,"flipY":false,"opacity":1,"shadow":null,"visible":true,"clipTo":null,"backgroundColor":"","fillRule":"nonzero","globalCompositeOperation":"source-over","transformMatrix":null,"skewX":0,"skewY":0,"src":"http:\/\/127.0.0.1\/greatcanvasprints\/web\/media\/designtool\/canvasprints\/single-print\/1813\/small_=_=_=26961_1499666667USA91235_1of12_1Panel_8x8_0-_-_-0_test.75_BorderColor_HooksforHanging_Original_1pcs_P_","filters":[],"resizeFilters":[],"crossOrigin":"","alignX":"none","alignY":"none","meetOrSlice":"meet"}],"background":null}]

案例2）。应用缩放后的Json＆amp;轮换：

[{"objects":[{"type":"image","originX":"left","originY":"top","left":278.28,"top":-275.14,"width":1000,"height":667,"fill":"rgb(0,0,0)","stroke":null,"strokeWidth":0,"strokeDashArray":null,"strokeLineCap":"butt","strokeLineJoin":"miter","strokeMiterLimit":10,"scaleX":0.83,"scaleY":0.83,"angle":45,"flipX":false,"flipY":false,"opacity":1,"shadow":null,"visible":true,"clipTo":null,"backgroundColor":"","fillRule":"nonzero","globalCompositeOperation":"source-over","transformMatrix":null,"skewX":0,"skewY":0,"src":"http:\/\/127.0.0.1\/greatcanvasprints\/web\/media\/designtool\/canvasprints\/single-print\/1813\/small_=_=_=26961_1499666667USA91235_1of12_1Panel_8x8_0-_-_-0_test.75_BorderColor_HooksforHanging_Original_1pcs_P_","filters":[],"resizeFilters":[],"crossOrigin":"","alignX":"none","alignY":"none","meetOrSlice":"meet"}],"background":null}]

我想在PHP中对原始图像执行相同的操作而我只需要设计区域（画布区域）。下面是PHP中的一些代码：

Php Code在第一种情况下工作正常：仅应用缩放

get Original File
$originalImg = imagecreatefromjpeg('26961_1499666667USA91235_1of12_1Panel_8x8_0-_-_-0_test.75_BorderColor_HooksforHanging_Original_1pcs_P_');

Here is width and height (pixels) of resized image which used in canvas 

$inToolUsedFileWidth = 1000;
$inToolUsedFileHeight = 667;

here is width & height (pixels) of Original File

$originalFileWidth = 5760;
$originalFileHeight = 3840;

$scaleX = 0.83 
$scaleY = 0.83 

$ratioWidth = ($originalFileWidth/$inToolUsedFileWidth) * (1 / $scaleX);   
$ratioHeight = ($originalFileHeight/$inToolUsedFileHeight) * (1 / $scaleY);  

380 default canvas width

$canvasWidth = 380 * $ratioWidth; 

217.143 default canvas height

$canvasHeight = 217.143 * $ratioHeight; 

same As first json value

$left = -39; 
$top = -62.76; 

$croppArr = array('x' => (abs($left) * $ratioWidth),'y' => (abs($top) * $ratioHeight),'width' => $canvasWidth,'height' => $canvasHeight);


$croppedImg = $this->imageCrop($originalImg,$croppArr);

只有缩放才能正常工作

案例2：应用轮换后

但是在应用旋转时，我只是旋转原始图像。但是没有获得在画布上设计的精确设计部分。

$originalImg = imagecreatefromjpeg('26961_1499666667USA91235_1of12_1Panel_8x8_0-_-_-0_test.75_BorderColor_HooksforHanging_Original_1pcs_P_');

// Same as second Json angle value

$antiRotation = (float) -(45); // here anti clockwise rotation in php so prepend nagetive value 
$originalImg = imagerotate($originalImg,$antiRotation,0);

然后使用上面的代码＆amp;刚改变了左右最高值为每秒json。

没有获得在画布上设计的确切输出。

我想知道我们如何重新计算左和右在Fabric Js中旋转后对象的顶部位置。

在第一种情况下：左= -39，上= = 62.76且角= 0

在第二种情况下：左= 278.28，上= -275.14和角= 45

哪个逻辑适用于左和右;最高位置，轮换后。

我想用PHP做同样的事。

由于尺寸较大，无法附加原始图像。

Image 1 Image 2

Answer 1

我不知道你使用的是什么php工具。您应该只读取fabricjs中转换管道的数学并复制它。

1）将面料设置为originX，originY'center'，'center'。这将简化逻辑。

2）一旦完成顶部，图像左侧将是确切的中心

3）在php中移动到中心（上，左）

4）旋转画布

5）缩小适量

6）在-width / 2，-height / 2

处绘制图像

或者如果你的php工具允许使用变换矩阵，复制fabricjs方法object.calcTransformMatrix将结果应用到画布，在-width / 2，-height / 2处绘制图像。

我们如何在使用结构Js在画布上应用的php中对图像进行相同的操作（Scale＆amp; Rotation）？

1 个答案: