37 lines
1011 B
Plaintext
37 lines
1011 B
Plaintext
/**
|
|
* @file 椭圆转换成轮廓
|
|
* @author mengke01(kekee000@gmail.com)
|
|
*/
|
|
|
|
import {computePath} from '../../graphics/computeBoundingBox';
|
|
import pathAdjust from '../../graphics/pathAdjust';
|
|
import circlePath from '../../graphics/path/circle';
|
|
import {clone} from '../../common/lang';
|
|
|
|
/**
|
|
* 椭圆转换成轮廓
|
|
*
|
|
* @param {number} cx 椭圆中心点x
|
|
* @param {number} cy 椭圆中心点y
|
|
* @param {number} rx 椭圆x轴半径
|
|
* @param {number} ry 椭圆y周半径
|
|
* @return {Array} 轮廓数组
|
|
*/
|
|
export default function oval2contour(cx, cy, rx, ry) {
|
|
|
|
if (undefined === ry) {
|
|
ry = rx;
|
|
}
|
|
|
|
const bound = computePath(circlePath);
|
|
const scaleX = (+rx) * 2 / bound.width;
|
|
const scaleY = (+ry) * 2 / bound.height;
|
|
const centerX = bound.width * scaleX / 2;
|
|
const centerY = bound.height * scaleY / 2;
|
|
const contour = clone(circlePath);
|
|
pathAdjust(contour, scaleX, scaleY);
|
|
pathAdjust(contour, 1, 1, +cx - centerX, +cy - centerY);
|
|
|
|
return contour;
|
|
}
|