html qr.js教程,Fabric.js qrDecompose()用法及代码示例

qrDecompose()方法用于将指定的标准2×3矩阵分解为变换分量

用法:

qrDecompose( mat )

参数：此方法接受如上所述和以下描述的参数：

mat:此参数保存变换矩阵的指定数组。

返回值：此方法返回转换的组成部分。

范例1：

Javascript

// Calling qrDecompose() function over

// the specified array of transform matrix

console.log(fabric.util

.qrDecompose([1, 2, 3, 4, 5, 6]));

输出：

{"angle":63.434948822922,"scaleX":2.23606797749979,"scaleY":-0.8944271909999159,

"skewX":65.55604521958347,"skewY":0,"translateX":5,"translateY":6}

范例2：

Javascript

// Specifying some array of transform matrix

var a1 = [1, 2, 3];

var a2 = [0, 6, 7, 8, 0, 0];

// Calling qrDecompose() function over the

// above specified array of transform matrix

console.log(fabric.util.qrDecompose(a1));

console.log(fabric.util.qrDecompose(a2));

输出：

{"angle":63.434948822922,"scaleX":2.23606797749979,"scaleY":null,"skewX":null,"skewY":0}

{"angle":90,"scaleX":6,"scaleY":-7,"skewX":53.13010235415598,"skewY":0,

"translateX":0,"translateY":0}