svg-path-bezier

https://github.com/jarek-foksa/path-data-polyfill https://github.com/gesource/SVGBezierCurvie

  view source
  JavaScript
  ?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226 'use strict'
/**
 * SVGのベジェ曲線
 */
class SVGBezierCurvie {
    /**
     * @param {SVGCanvas} canvas
     * @param p1 始点
     * @param cp1 制御点1
     * @param cp2 制御点2
     * @param p2 終点
     */
    constructor(canvas, p1, cp1, cp2, p2) {
        this.canvas = canvas;
        this.path = this.createPath(p1, cp1, cp2, p2);
        this.auxiliaryLine1 = this.createAuxiliaryLine(p1, cp1); //補助線1
        this.auxiliaryLine2 = this.createAuxiliaryLine(p2, cp2); //補助線1
        this.p1 = this.createPoint(p1.x, p1.y);  //始点
        this.cp1 = this.createPoint(cp1.x, cp1.y);   //制御点1
        this.cp2 = this.createPoint(cp2.x, cp2.y);   //制御点2
        this.p2 = this.createPoint(p2.x, p2.y);  //終点
    }
    /**
     * 点を作成する
     * @param {number} x 中心のX座標
     * @param {number} y 中心のY座標
     */
    createPoint(x, y) {
        const circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
        circle.cx.baseVal.value = x;
        circle.cy.baseVal.value = y;
        circle.r.baseVal.value = 10;
        circle.onMoved = () => {
            this.updateAuxiliaryLine();
            this.updatePath();
        };
        this.canvas.appendChild(circle);
        return circle;
    }
    /**
     * 補助線を作成する
     * @param p1 始点
     * @param p2 終点
     */
    createAuxiliaryLine(p1, p2) {
        const line = document.createElementNS("http://www.w3.org/2000/svg", "line");
        line.x1.baseVal.value = p1.x;
        line.y1.baseVal.value = p1.y;
        line.x2.baseVal.value = p2.x;
        line.y2.baseVal.value = p2.y;
        line.setAttribute('stroke', 'gray');
        line.setAttribute('stroke-width', 5);
        line.setAttribute('stroke-dasharray', 5);
        this.canvas.appendChild(line);
        return line;
    }
    createPath(p1, cp1, cp2, p2) {
        const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
        const pathData = [
            { type: "M", values: [p1.x, p1.y] },
            { type: "C", values: [cp1.x, cp1.y, cp2.x, cp2.y, p2.x, p2.y] },
        ];
        path.setPathData(pathData);
        path.setAttribute('stroke', 'blue');
        path.setAttribute('stroke-width', 5);
        path.style.fillOpacity = 0;
        this.canvas.appendChild(path);
        return path;
    }
    updateAuxiliaryLine() {
        this.auxiliaryLine1.x1.baseVal.value = this.p1.cx.baseVal.value;
        this.auxiliaryLine1.y1.baseVal.value = this.p1.cy.baseVal.value;
        this.auxiliaryLine1.x2.baseVal.value = this.cp1.cx.baseVal.value;
        this.auxiliaryLine1.y2.baseVal.value = this.cp1.cy.baseVal.value;
        this.auxiliaryLine2.x1.baseVal.value = this.cp2.cx.baseVal.value;
        this.auxiliaryLine2.y1.baseVal.value = this.cp2.cy.baseVal.value;
        this.auxiliaryLine2.x2.baseVal.value = this.p2.cx.baseVal.value;
        this.auxiliaryLine2.y2.baseVal.value = this.p2.cy.baseVal.value;
    }
    updatePath() {
        const pathData = [
            { type: "M", values: [this.p1.cx.baseVal.value, this.p1.cy.baseVal.value] },
            {
                type: "C", values: [
                    this.cp1.cx.baseVal.value,
                    this.cp1.cy.baseVal.value,
                    this.cp2.cx.baseVal.value,
                    this.cp2.cy.baseVal.value,
                    this.p2.cx.baseVal.value,
                    this.p2.cy.baseVal.value
                ]
            },
        ];
        this.path.setPathData(pathData);
    }
}
class SVGCanvas {
    /**
     * @param {SVGSVGElement} svg_id SVG要素のID
     */
    constructor(svg_id) {
        this.dragElem = null;
        this.offsetX = 0;
        this.offsetY = 0;
        this.svg = document.getElementById(svg_id);
        this.svg.addEventListener("mousemove", e => this.mouseMove(e), false);
        this.svg.addEventListener("touchmove", e => this.mouseMove(e), false);
        this.svg.addEventListener("mouseup", e => this.mouseUp(e), false);
        this.svg.addEventListener("touchend", e => this.mouseUp(e), false);
    }
    /**
     *ベジェ曲線を追加する
     * @param p1 始点
     * @param cp1 制御点1
     * @param cp2 制御点2
     * @param p2 終点
     */
    addBezierCurvie(p1, cp1, cp2, p2) {
        const bezierCurvie = new SVGBezierCurvie(this.svg, p1, cp1, cp2, p2);
        this.setDragEvent(bezierCurvie.p1);
        this.setDragEvent(bezierCurvie.cp1);
        this.setDragEvent(bezierCurvie.cp2);
        this.setDragEvent(bezierCurvie.p2);
    }
    /**
     * SVGElementをドラッグ可能にする
     * @param {SVGElement} elem ドラッグ可能要素
     */
    setDragEvent(elem) {
        elem.addEventListener("mousedown", e => this.mouseDown(e), false);
        elem.addEventListener("touchstart", e => this.mouseDown(e), false);
        elem.addEventListener("mousemove", e => this.mouseMove(e), false);
        elem.addEventListener("touchmove", e => this.mouseMove(e), false);
        elem.addEventListener("mouseup", e => this.mouseUp(e), false);
        elem.addEventListener("touchend", e => this.mouseUp(e), false);
    }
    /**
     * @param {string} line_id 補助線のID
     */
    addLine(line_id) {
        this.line = document.getElementById(line_id);
    }
    /**
     * 画面座標(x,y)をSVG座標に変換する
     * @param {SVGSVGElement} svg SVG要素
     * @param {SVGSVGElement} elem
     * @param {number} x
     * @param {number} y
     * @return {SVGPoint} SVG上の座標
     */
    screenPointToSVGPoint(svg, elem, x, y) {
        const p = svg.createSVGPoint();
        p.x = x;
        p.y = y;
        const CTM = elem.getScreenCTM();
        return p.matrixTransform(CTM.inverse());
    }
    mousePointToSVGPoint(e) {
        return this.screenPointToSVGPoint(
            this.svg,
            this.dragElem,
            e.clientX,
            e.clientY);
    }
    /**
     * @param {MouseEvent} e
     */
    mouseDown(e) {
        const event = (e.type === "mousedown") ? e : e.changedTouches[0];;
        this.dragElem = event.target;
        const p = this.mousePointToSVGPoint(event);
        this.offsetX = p.x - this.dragElem.getAttribute("cx");
        this.offsetY = p.y - this.dragElem.getAttribute("cy");
        event.preventDefault();
    }
    /**
     * @param {MouseEvent} e
     */
    mouseUp(e) {
        this.dragElem = null;
    }
    /**
     * @param {MouseEvent} e
     */
    mouseMove(e) {
        if (!this.dragElem) { return; }
        const event = (e.type === "mousemove") ? e : e.changedTouches[0];
        const p = this.mousePointToSVGPoint(event);
        this.dragElem.cx.baseVal.value = p.x - this.offsetX;
        this.dragElem.cy.baseVal.value = p.y - this.offsetY;
        this.dragElem.onMoved();
        event.preventDefault();
    }
}
 
function init() {
  const canvas = new SVGCanvas('svg');
  canvas.addBezierCurvie(
      { x: 0, y: 0 },
      { x: 300, y: 100 },
      { x: 100, y: 300 },
      { x: 400, y: 400 });
  outputXY();
}
 
var outputXY = function(){
  $(function(){
    $('circle').each(function(){
      var x = $(this).attr('cx');
      var y = $(this).attr('cy');
      var input = $('<input>').val(x+':'+y);
      $('#svg').after(input);
    });
 
    $('#svg').on('mousemove', function(){
      $('circle').each(function(index){
        var x = $(this).attr('cx');
        var y = $(this).attr('cy');
        $('input').eq(index).val(x+':'+y);
      });
    });
  });
}
 
 
init();
  CSS
  ?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 #svgWrap{
  width:420px;
  margin: auto;
}
#svg {
  border:4px solid #eee;
  display: block;
  margin: auto;
}
 
circle {
  cursor: move;
}
 
input{
  display: block;
  font-size:22px;
}
  HTML
  
    ページのソースを表示 : Ctrl+U , DevTools : F12
    view-source:https://hi0a.com/demo/-svg/svg-path-bezier/
  
  ABOUT
  
    hi0a.com 「ひまアプリ」は無料で遊べるミニゲームや便利ツールを公開しています。
    プログラミング言語の動作デモやWEBデザイン、ソースコード、フロントエンド等の開発者のための技術を公開しています。
    必要な機能の関数をコピペ利用したり勉強に活用できます。
    プログラムの動作サンプル結果は画面上部に出力表示されています。
    環境:最新のブラウザ GoogleChrome / Windows / Android / iPhone 等の端末で動作確認しています。
    画像素材や音素材は半分自作でフリー素材配布サイトも利用しています。LINK参照。
    動く便利なものが好きなだけで技術自体に興味はないのでコードは汚いです。
    途中放置や実験状態、仕様変更、API廃止等で動かないページもあります。