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今回はh5の性能変化の折れ線グラフをお届けします。 h5の性能変化の折れ線グラフを作成する際の注意点を実際のケースで見てみましょう。
内部要素の高さを動的に設定する =>
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>示例1</title> <style> #title { margin: 2px; font-family: Helvetica, Arial, sans-serif; font-size: 9px; font-weight: bold; line-height: 15px; color: rgb(0, 255, 255); } #demo { width: 74px; height: 30px; background: rgb(0, 255, 255); margin: 2px } span.col { width: 1px; height: 100%; float: left; opacity: 0.9; background: rgb(0, 0, 34); } </style></head><body> <div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 0px;margin: 10px; background: rgb(0, 0, 34);"> <div id="title"></div> <div id="demo"></div> </div> <script> function fillLineChart(id) { this.id = id; this.el = document.getElementById(id); this.value = 0;//当前值 this.width = parseInt(this.el.clientWidth) this.last=this.width-1;//从左往右最后一个span的索引 for (var i = 0; i < this.width; i++) {//初始化span this.el.innerHTML +='<span class="col"></span>'; } this.draw = function (value) {//绘制事件 this.value = value;//记录当前值 for (var i = 0; i <this.last; i++) {//遍历前x-1个,将后一个值赋给前一个 var tmph = this.el.getElementsByTagName("span")[i + 1].style.height;//获取下一个值 this.el.getElementsByTagName("span")[i].style.height = tmph;//赋给当前的 } this.el.getElementsByTagName("span")[this.last].style.height = parseInt(this.el.clientHeight) * (100 - this.value) / 100 + "px";//设置最后span一个高度=span容器的高度x值百分比 } } var demo = new fillLineChart("demo"); var val = 0 setInterval(function () { val = rand(rand(20, 50), 60); document.getElementById('title').innerHTML = `示例(${val})` demo.draw(val); }, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin; } </script></body></html>
2.キャンバスにより =>[例]
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>示例2</title> <style> #title { margin: 2px; font-family: Helvetica, Arial, sans-serif; font-size: 9px; font-weight: bold; line-height: 15px; color: rgb(0, 255, 255); } #demo { margin: 2px } span.col { width: 1px; height: 100%; float: left; opacity: 0.9; background: rgb(0, 0, 34); } </style></head><body> <div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 0px;margin: 10px; background: rgb(0, 0, 34);"> <div id="title"></div> <canvas id="demo" width="74" height="30"></canvas> </div> <script> function fillLineChart(id) { this.id = id; this.canvas = document.getElementById(id); this.value = 0; this.width = (this.canvas.clientWidth)//获取
バインド幅
this.height = (this.canvas.clientHeight) //获取高度宽度 this.context = this.canvas.getContext("2d"); this.values = []; this.last = this.width - 1;//最后一个值的索引 for (var i = 0; i < this.width; i++) {//初始化值 this.values.push(this.height); } this.draw = function (value) { this.value = value;//记录当前值 this.context.clearRect(0, 0, this.width, this.height);//清空 this.context.beginPath();//开辟新的绘制路径 this.context.moveTo(0, this.height);//绘制起点 for (var i = 0; i <this.last; i++) { this.values[i] = this.values[i + 1];//移动索引值 this.context.lineTo(i, this.values[i]);//结束位置 } this.values[this.last] = this.height * (100 - value) / 100;//获取最后索引一个值 this.context.lineTo(this.last, this.values[this.last]);//设置最后一个索引位置 this.context.lineTo(i, this.height);//绘制结束 this.context.fillStyle = ' rgb(0, 255, 255)';//填充绘制区域的颜色 this.context.fill();//填充 } } var demo = new fillLineChart("demo"); var val = 0 setInterval(function () { val = rand(rand(20, 50), 60); document.getElementById('title').innerHTML = `示例(${val})` demo.draw(val); }, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin; } </script></body></html>
3.キャンバスの強化=>[例]
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>示例3</title> <style> #title {margin: 2px; font-family: Helvetica, Arial, sans-serif; font-size: 9px; font-weight: bold; line-height: 15px; color: rgb(0, 255, 255);} #demo {margin: 2px} span.col { width: 1px; height: 100%; float: left; opacity: 0.9; background: rgb(0, 0, 34);} </style></head><body> <label ><input type="checkbox" onclick="demo.isFull=this.checked" checked/>填充显示</label> <div style=" opacity: 0.9; cursor: pointer; position: absolute; top: 30px;margin: 10px; background: rgb(0, 0, 34);"> <div id="title"></div> <canvas id="demo"></canvas> </div> <script> function lineChart(o) { this.id = o.id; this.canvas = document.getElementById(o.id); this.color = o.color || 'rgb(0, 255, 255)'; this.value = 0; this.isFull = o.isFull || false;//是否填充颜色 this.canvas.width = this.width = o.width || (this.canvas.clientWidth);//获取绑定宽度 this.canvas.height = this.height = o.height || (this.canvas.clientHeight);//获取高度宽度 this.context = this.canvas.getContext("2d"); this.values = []; this.last = this.width - 1;//最后一个值的索引 for (var i = 0; i < this.width; i++) {//初始化值 this.values.push(this.height); } this.draw = function (value) { this.value = value;//记录当前值 this.context.clearRect(0, 0, this.width, this.height);//清空 this.context.beginPath();//开辟新的绘制路径 this.context.moveTo(0, this.isFull ? this.height : this.values[1]);//绘制起点 for (var i = 0; i < this.last; i++) { this.values[i] = this.values[i + 1];//移动索引值 this.context.lineTo(i, this.values[i]);//结束位置 } this.values[this.last] = this.height * (100 - value) / 100;//获取最后索引一个值 this.context.lineTo(this.last, this.values[this.last]);//设置最后一个索引位置 if (this.isFull) { this.context.lineTo(i, this.height);//绘制结束 this.context.fillStyle = this.color;//填充绘制区域的颜色 this.context.fill();//填充 } else { this.context.strokeStyle = this.color; this.context.stroke(); } } } var demo = new lineChart({ id: "demo", width: "74", height: "30", isFull: true, }); var val = 0 setInterval(function () { val = rand(rand(20, 50), 60); document.getElementById('title').innerHTML = `示例(${val})` demo.draw(val); }, 100); function rand(begin, end) { return Math.floor(Math.random() * (end - begin)) + begin; } </script></body> </html>
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