正文

JavaScript 绘制饼图的示例

︶ㄣSDDLL学院 メ
SDDLL学院V管理员 / 阅读
0720
这篇文章主要介绍了JavaScript 绘制饼图的示例，帮助大家更好的利用JavaScript绘制图表，感兴趣的朋友可以了解下

这篇文章主要介绍了JavaScript 绘制饼图的示例，帮助大家更好的利用JavaScript绘制图表，感兴趣的朋友可以了解下

绘制效果

JavaScript 绘制饼图的示例

实现代码

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
var canvas = document.getElementById("mycanvas");
var w = window.innerWidth;
var h = window.innerHeight;
canvas.height = 1000;
canvas.width = 1400;
var ctx = canvas.getContext('2d');
 
var poppable = true;
 
var slices = [];
 
function shadeColor(color, percent) {
 var f = parseInt(color.slice(1), 16),
  t = percent < 0 ? 0 : 255,
  p = percent < 0 ? percent * -1 : percent,
  R = f >> 16,
  G = f >> 8 & 0x00FF,
  B = f & 0x0000FF;
 return "#" + (0x1000000 + (Math.round((t - R) * p) + R) * 0x10000 + (Math.round((t - G) * p) + G) * 0x100 + (Math.round((t - B) * p) + B)).toString(16).slice(1);
}
 
function pieSlice(oX, oY, r, pos, len, col,data) {
 this.data = data
 this.originX = oX;
 this.originY = oY;
 this.radius = r;
 this.startingRadian = pos;
 this.length = len;
 this.color = col;
 this.highlightedColor = shadeColor(this.color, .6);
 this.highlighted = false;
 this.popped = false;
 this.animationFrame = 0;
 
 function setColor(c) {
  this.color = c;
 }
}
 
pieSlice.prototype.displayData = function(){
 ctx.fillStyle= this.color;
 ctx.fillRect(this.originX - this.radius - 40, this.originY-this.radius-35, 25,25);
 ctx.fillStyle= "white";
 ctx.font = "15px Arial";
 ctx.fillText(this.data, this.originX - this.radius - 10, this.originY - this.radius - 18);
}
 
pieSlice.prototype.render = function() {
 if (!this.highlighted) {
  ctx.fillStyle = this.color;
  ctx.strokeStyle = this.color;
 } else {
  if(!this.popped && poppable){
   this.displayData();
  }
  // ctx.fillStyle = this.color;
  ctx.fillStyle = this.highlightedColor;
  ctx.strokeStyle = this.color;
 }
 ctx.beginPath();
 var xOffset = Math.cos(this.length / 2 + this.startingRadian) * this.animationFrame;
 var yOffset = Math.sin(this.length / 2 + this.startingRadian) * this.animationFrame;
 ctx.moveTo(this.originX + xOffset, this.originY + yOffset);
 var x = this.originX + xOffset + this.radius * Math.cos(this.startingRadian);
 var y = this.originY + yOffset + this.radius * Math.sin(this.startingRadian);
 ctx.lineTo(x, y);
 ctx.arc(this.originX + xOffset, this.originY + yOffset, this.radius, this.startingRadian, this.startingRadian + this.length);
 if (this.popped) {
  var fill = ctx.fillStyle;
  this.displayData();
  ctx.fillStyle = fill;
  if (this.animationFrame < 30) {
   this.animationFrame += 2;
  }
 } else {
  if (this.animationFrame > 0) {
   this.animationFrame -= 2;
  }
 }
 ctx.closePath();
 //ctx.stroke();
 //if (this.highlighted) {
 ctx.fill();
 // }
}
 
pieSlice.prototype.update = function() {
 
}
 
function pieChart(s) {
 this.slices = s;
}
pieChart.prototype.render = function() {
 this.slices.forEach(function(p) {
  p.render();
 });
};
 
pieChart.prototype.update = function() {
  this.slices.forEach(function(p) {
   p.update();
  });
 
 }
 //PIE ONE
var pie = new pieSlice(700, 170, 125, 0, Math.PI / 4, "#FFD1DC", 12);
var slice2 = new pieSlice(700, 170, 125, Math.PI / 4, Math.PI / 4, "#08E8DE");
var slice3 = new pieSlice(700, 170, 125, Math.PI / 2, Math.PI / 4, "#6699CC");
var slice4 = new pieSlice(700, 170, 125, 3 * Math.PI / 4, Math.PI, "#ADD8E6");
var slice5 = new pieSlice(700, 170, 125, 7 * Math.PI / 4, Math.PI / 4, "#B19CD9");
var slices1 = [pie, slice2, slice3, slice4, slice5];
 
var pink = new pieSlice(220, 170, 125, 0, Math.PI / 3, "#FF4B4B");
var orange = new pieSlice(220, 170, 125, Math.PI / 3, Math.PI / 3, "#FF931B");
var yellow = new pieSlice(220, 170, 125, 2 * Math.PI / 3, Math.PI / 3, "#FFE21B");
var green = new pieSlice(220, 170, 125, 3 * Math.PI / 3, Math.PI / 3, "#90E64E");
var blue = new pieSlice(220, 170, 125, 4 * Math.PI / 3, Math.PI / 3, "#6097D9");
var purple = new pieSlice(220, 170, 125, 5 * Math.PI / 3, Math.PI / 3, "#8365DD");
 
var redd = new pieSlice(1180, 170, 125, 0, 2 * Math.PI / 3, "#B3989B");
var orangee = new pieSlice(1180, 170, 125, 2 * Math.PI / 3, 1 * Math.PI / 8, "#C1AEE0");
var bluee = new pieSlice(1180, 170, 125, 19 * Math.PI / 24, 4 * Math.PI / 24, "#928CE9");
var greenn = new pieSlice(1180, 170, 125, 23 * Math.PI/24, 3* Math.PI/8, "#676675");
var purplee = new pieSlice(1180, 170, 125, 4 * Math.PI/3, 3* Math.PI/8, "#947D59");
var ceci = new pieSlice(1180, 170, 125, 41 * Math.PI/24, 7*Math.PI/24, "#D994E0");
 
var slices3 = [redd, orangee, bluee, greenn, purplee, ceci];
 
var slices2 = [pink, orange, yellow, green, blue, purple];
var pie1 = new pieChart(slices1);
var pie2 = new pieChart(slices2);
var pie3 = new pieChart(slices3);
var update = function() {
 pie1.update();
}
var render = function() {
 ctx.clearRect(0, 0, canvas.width, canvas.height);
 pie1.render();
 pie2.render();
 pie3.render();
}
 
var step = function() {
 update();
 render();
 animate(step);
}
 
var animate = window.requestAnimationFrame ||
 window.webkitRequestAnimationFrame ||
 window.mozRequestAnimationFrame ||
 function(callback) {
  window.setTimeout(callback, 1000 / 60);
 };
 
slices.push.apply(slices, slices1);
slices.push.apply(slices, slices2);
slices.push.apply(slices, slices3);
 
canvas.addEventListener("mousemove", function(e) {
 var x = e.clientX;
 var y = e.clientY;
 slices.forEach(function(slice) {
  ctx.beginPath();
  var xOffset = Math.cos(slice.length / 2 + slice.startingRadian) * slice.animationFrame;
  var yOffset = Math.sin(slice.length / 2 + slice.startingRadian) * slice.animationFrame;
  ctx.moveTo(slice.originX + xOffset, slice.originY + yOffset);
  var xx = slice.originX + xOffset + slice.radius * Math.cos(slice.startingRadian);
  var yy = slice.originY + yOffset + slice.radius * Math.sin(slice.startingRadian);
  ctx.lineTo(xx, yy);
  ctx.arc(slice.originX + xOffset, slice.originY + yOffset, slice.radius, slice.startingRadian, slice.startingRadian + slice.length);
  if (ctx.isPointInPath(x, y)) {
   slice.highlighted = true;
   slice.displayData();
  } else {
   slice.highlighted = false;
  }
  ctx.closePath();
 
 });
});
 
canvas.addEventListener("click", function(e) {
 var x = e.clientX;
 var y = e.clientY;
 slices.forEach(function(slice) {
  ctx.beginPath();
  var xOffset = Math.cos(slice.length / 2 + slice.startingRadian) * slice.animationFrame;
  var yOffset = Math.sin(slice.length / 2 + slice.startingRadian) * slice.animationFrame;
  ctx.moveTo(slice.originX + xOffset, slice.originY + yOffset);
  var xx = slice.originX + xOffset + slice.radius * Math.cos(slice.startingRadian);
  var yy = slice.originY + yOffset + slice.radius * Math.sin(slice.startingRadian);
  ctx.lineTo(xx, yy);
  ctx.arc(slice.originX + xOffset, slice.originY + yOffset, slice.radius, slice.startingRadian, slice.startingRadian + slice.length);
  if (ctx.isPointInPath(x, y)) {
   if (slice.popped) {
    slice.popped = false;
    poppable = true;
   } else {
    if(poppable){
      slice.popped = true;
     poppable = false;
    }
   }
   slice.highlighted = false;
  }
  ctx.closePath();
 
 });
});
 
//start the loop
animate(step);

html

?
1
<canvas id="mycanvas"></canvas>

以上就是JavaScript 绘制饼图的示例的详细内容，更多关于JavaScript 绘制饼图的资料请关注米米素材网其它相关文章！

原文链接：https://codepen.io/brgirardeau/pen/MwqgKG