| 1 |
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| 2 | /**
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| 3 | * @description 返回当前两点连成的线与Y轴的夹角
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| 4 | * @author SoldierAb
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| 5 | * @param {Number} 起始坐标x1,y1 当前坐标x2,y2
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| 6 | * @returns {Object}
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| 7 | * @example
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| 8 | * ·
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| 9 | * · ^ y
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| 10 | * (x1,y1) * |
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| 11 | * · |
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| 12 | * · |
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| 13 | * · |
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| 14 | * · |
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| 15 | * (x2,y2) * |
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| 16 | * · |
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| 17 | * -----------------------·-------------------------->
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| 18 | * ·| O x
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| 19 | * |
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| 20 | * |·
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| 21 | * |
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| 22 | * |
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| 23 | * |
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| 24 | * |
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| 25 | * |
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| 26 | * |
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| 27 | *
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| 28 | *
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| 29 | *
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| 30 | *
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| 31 | */
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| 32 |
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| 33 | export default (x1, y1, x2, y2) => {
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| 34 | // 直角的边长
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| 35 | let x = Math.abs(x1 - x2);
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| 36 | let y = Math.abs(y1 - y2);
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| 37 | // 斜边长
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| 38 | let z = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
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| 39 | // 余弦
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| 40 | let cos = y / z;
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| 41 | // 弧度
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| 42 | let radina = Math.acos(cos);
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| 43 | // 角度
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| 44 | let angle = 180 / (Math.PI / radina);
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| 45 | return {
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| 46 | angle: angle,
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| 47 | xdis: x2 - x1,
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| 48 | ydis: y2 - y1
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| 49 | };
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| 50 | } |
| \ | No newline at end of file |