fonteditor-core
Version:
fonts (ttf, woff, woff2, eot, svg, otf) parse, write, transform, glyph adjust.
41 lines (39 loc) • 918 B
JavaScript
/**
* @file 对轮廓进行transform变换
* @author mengke01(kekee000@gmail.com)
*
* 参考资料：
* http://blog.csdn.net/henren555/article/details/9699449
*
* |X| |a c e| |x|
* |Y| = |b d f| * |y|
* |1| |0 0 1| |1|
*
* X = x * a + y * c + e
* Y = x * b + y * d + f
*/
/**
* 图形仿射矩阵变换
*
* @param {Array.<Object>} contour 轮廓点
* @param {number} a m11
* @param {number} b m12
* @param {number} c m21
* @param {number} d m22
* @param {number} e dx
* @param {number} f dy
* @return {Array.<Object>} contour 轮廓点
*/
export default function transform(contour, a, b, c, d, e, f) {
let x;
let y;
let p;
for (let i = 0, l = contour.length; i < l; i++) {
p = contour[i];
x = p.x;
y = p.y;
p.x = x * a + y * c + e;
p.y = x * b + y * d + f;
}
return contour;
}