68 lines
1.8 KiB
JavaScript
68 lines
1.8 KiB
JavaScript
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/** 三角函数计算 */
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function JTriangle(beg, end) {
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this.init(beg, end);
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}
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JTriangle.prototype = {
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constructor: JTriangle,
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beg: null,
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end: null,
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abspowx: 0,
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abspowy: 0,
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abspowz: 0,
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drictx: 0,
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dricty: 0,
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drict: 0,
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init (beg, end) {
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this.beg = beg;
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this.end = end;
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this.abspowx = Math.pow(this.end.x - this.beg.x, 2);
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this.abspowy = Math.pow(this.end.y - this.beg.y, 2);
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this.abspowz = this.abspowx + this.abspowy;
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this.absx = Math.abs(this.end.x - this.beg.x);
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this.absy = Math.abs(this.end.y - this.beg.y);
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this.absz = Math.sqrt(Math.pow(this.end.x - this.beg.x, 2), Math.pow(this.end.y - this.beg.y, 2));
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this.drictx = this.end.x > this.beg.x ? 1 : -1;
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this.dricty = this.end.y > this.beg.y ? 1 : -1;
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this.drict = this.drictx * this.dricty;
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this.diff_x = end.x - beg.x;
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this.diff_y = end.y - beg.y;
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},
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getRotation () {
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return Math.atan(this.diff_y / this.diff_x);
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},
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getAngle () {
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return 360 * Math.atan(this.diff_y / this.diff_x) / (2 * Math.PI);
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},
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getCos (n) {
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return this.drictx * Math.sqrt(Math.pow(n, 2) * this.abspowx / this.abspowz);
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},
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getSin (n) {
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return this.dricty * Math.sqrt(Math.pow(n, 2) * this.abspowy / this.abspowz);
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},
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getCosRate () {
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return Math.sqrt(this.abspowx / this.abspowz);
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},
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getSinRate () {
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return Math.sqrt(this.abspowy / this.abspowz);
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},
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getTanRate () {
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var diff_x = this.end.x - this.beg.x;
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var diff_y = this.end.y - this.beg.y;
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return Math.abs(diff_y / diff_x);
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},
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getCotRate () {
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var diff_x = this.end.x - this.beg.x;
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var diff_y = this.end.y - this.beg.y;
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return Math.abs(diff_x / diff_y);
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},
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middlePoint () {
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return {
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x: Math.min(this.end.x, this.beg.x) + Math.abs(this.end.x - this.beg.x) / 2,
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y: Math.min(this.end.y, this.beg.y) + Math.abs(this.end.y - this.beg.y) / 2
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};
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}
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};
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export default JTriangle;
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