绘制效果
实现代码
JavaScript
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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
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< 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服务器之家其它相关文章!
原文链接:https://codepen.io/brgirardeau/pen/MwqgKG