JavaScript 绘制饼图的示例

水深无声 2022-10-30 15:28 145阅读 0赞

实现代码  
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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