成为VIP如何用canvas画出一个路线图（代码）
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<head>
<meta http-equiv=content-type content=text/html;charset=utf-8>
<meta http-equiv=X-UA-Compatible content=IE=Edge>
<meta content=always name=referrer>
<meta content=width=device-width, initial-scale=1.0, minimum-scale=1.0 name=viewport />
<title>CITEK反向寻车</title>
<script src=<%=basePath%>wui/js/jquery.js></script>
<link rel=stylesheet href=<%=cssPath%>wui.css type=text/css></link>
<script type=text/javascript src=<%=basePath%>wui/js/line_tool.js></script>
<script type=text/javascript>
var arrPosX = [], arrPosY = [];
<s:iterator value=listNode status=bean> //设置路线中点的横坐标和纵坐标的集合
arrPosX.push(<s:property value=posX />);
arrPosY.push(<s:property value=posY />);
</s:iterator>
var arrRoundPosX = [], arrRoundPosY = []; //设置终点所在区域的范围点横坐标和纵坐标集合
<s:iterator value=positionsX status=bean>
arrRoundPosX.push(<s:property />);
</s:iterator>
<s:iterator value=positionsY status=bean>
arrRoundPosY.push(<s:property />);
</s:iterator>
var ctxBackground, canvasBackground;
var ctxSource, canvasSource;
var canvasWidth, canvasHeight;
var imgStart, imgEnd, imgBackground,;
var areaImage;
var isStart = false;
var scale = 1;
var scaleInterval = 3;
var scaleCount = 0;
var runCount = 0;
var step = 2; //像素
var moveX = 1;
var moveY = 1;
var currIndex = 0;
var a = 0;
var tmpIconPaths = [ //设置起点图标
<%=basePath%>img/point_start.png,
];
var imgObjArr = [];
var iLoadIndex = 0;
/**
* 将图标放入集合中
*/
function loadIconImages(){
var oImg = new Image();
oImg.addEventListener('load', eventIconImagesLoaded, false);
oImg.src = tmpIconPaths[iLoadIndex];
imgObjArr.push(oImg);
}
/**
* 加载图标
*/
function eventIconImagesLoaded(){
iLoadIndex++;
if(iLoadIndex <= 3) {
loadIconImages();
} else {
loadImage();
}
}
/**
* 加载背景图标
*/
function loadImage(){
areaImage = new Image();
areaImage.addEventListener('load', eventAreaImageLoaded, false);
areaImage.src =<%=basePath%>image/img.jpg;
}
function eventAreaImageLoaded(){
initBase();
initScene();
initSprits();
start();
isStart = true;
}
/**
* 初始化
*/
function initBase() {
imgStart = imgObjArr[0];
canvasBackground = document.getElementById(canvasBackground);
ctxBackground = canvasBackground.getContext(2d);
canvasSource = document.getElementById(canvasSource);
ctxSource = canvasSource.getContext(2d);
canvasWidth = areaImage.width;
canvasHeight = areaImage.height;
var bodyWidth = document.body.clientWidth-10;
var bodyHeight = document.body.clientHeight-10;
var tmpCavW = canvasWidth;
var tmpCavH = canvasHeight;
if(canvasWidth > bodyWidth) {
canvasWidth = bodyWidth;
canvasHeight = canvasWidth * (tmpCavH/tmpCavW);
}
if(canvasHeight > bodyHeight){
canvasHeight = bodyHeight;
canvasWidth = canvasHeight * (tmpCavW/tmpCavH);
}
canvasBackground.width = canvasWidth;
canvasBackground.height = canvasHeight;
canvasSource.width = canvasWidth;
canvasSource.height = canvasHeight;
moveX = arrPosX[0] * canvasWidth;
moveY = arrPosY[0] * canvasHeight;
}
/**
* 初始化画布
*/
function initScene() {
ctxBackground.drawImage(areaImage, 0, 0, canvasWidth, canvasHeight);
}
/**
* 开始绘图
*/
function initSprits() {
/* 绘制路线的白底 */
ctxBackground.beginPath();
ctxBackground.strokeStyle = white;
ctxBackground.lineWidth = 8;
ctxBackground.lineCap = round;
ctxBackground.lineJoin = miter;
ctxBackground.miterLimit = 30;
for(var i=1; i < arrPosX.length; i++){
ctxBackground.moveTo(canvasWidth * arrPosX[i-1], canvasHeight * arrPosY[i-1]); //指定一条线段的起点
ctxBackground.lineTo(canvasWidth * arrPosX[i], canvasHeight * arrPosY[i]); //指定一条线段的终点
}
ctxBackground.stroke();
/* 绘制路线的红线 */
ctxBackground.beginPath(); //是通过覆盖白底实现的
ctxBackground.strokeStyle = rgba(255,0,0,1);
ctxBackground.lineWidth = 4;
ctxBackground.lineCap = round;
ctxBackground.lineJoin = miter;
ctxBackground.miterLimit = 30;
for(var i=1; i < arrPosX.length; i++){
ctxBackground.moveTo(canvasWidth * arrPosX[i-1], canvasHeight * arrPosY[i-1]); //指定一条线段的起点
ctxBackground.lineTo(canvasWidth * arrPosX[i], canvasHeight * arrPosY[i]); //指定一条线段的终点
}
ctxBackground.stroke();
/* 绘制终点区域 */
ctxSource.clearRect(0, 0, canvasWidth,canvasHeight);
ctxBackground.beginPath();
ctxBackground.strokeStyle = rgba(255,0,0,1); //颜色
ctxBackground.lineWidth = 0.5;
ctxBackground.fillStyle = rgba(255,0,0,0); //透明度
ctxBackground.moveTo(canvasWidth * arrRoundPosX[0], canvasHeight * arrRoundPosY[0]); //指定一条线段的起点
for(var i=1; i < arrRoundPosX.length; i++){
ctxBackground.lineTo(canvasWidth * arrRoundPosX[i], canvasHeight * arrRoundPosY[i]); //指定一条线段的终点
}
ctxBackground.lineTo(canvasWidth * arrRoundPosX[0], canvasHeight * arrRoundPosY[0]);
ctxBackground.closePath();
ctxBackground.fill();
ctxBackground.stroke();
/* 绘制起点图标 */
ctxBackground.drawImage(
imgStart,
canvasWidth * arrPosX[0] - imgStart.width * 0.25,
canvasHeight * arrPosY[0] - imgStart.height * 0.25 - imgStart.height * 0.25,
imgStart.width * 0.5,
imgStart.height * 0.5);
}
/**
* 设置图标的跳动
*/
function loop(){
if(!isStart) return;
if(scale > 1.8) scale = 1;
if(scaleCount > 999999) scaleCount = 0;
if(runCount > 999999) runCount = 0;
ctxSource.save();
ctxSource.clearRect(0,0,canvasWidth,canvasHeight);
/* 设置起点图标的跳动 */
ctxSource.translate(
canvasWidth * arrPosX[0] - imgStart.width * 0.25 +imgStart.width*0.25,
canvasHeight * arrPosY[0] - imgStart.height * 0.25+imgStart.height*0.25);
ctxSource.scale(scale, scale);
ctxSource.shadowOffsetX = 3; // 阴影x轴偏移
ctxSource.shadowOffsetY = 4; // 阴影y轴偏移
ctxSource.shadowBlur = 2; // 模糊尺寸
ctxSource.shadowColor = 'rgba(0, 0, 0, 0.5)'; // 颜色
ctxSource.drawImage(
imgStart,
- imgStart.width * 0.25,
- imgStart.height * 0.25 - imgStart.height * 0.25,
imgStart.width * 0.5,
imgStart.height * 0.5);
ctxSource.restore();
ctxSource.save();
/* 设置终点区域的透明度变化 */
if (runCount % 4 == 0) {
a = a + 0.1;
}
if (a > 0.6) {
a = 0;
}
ctxSource.strokeStyle = rgba(255,0,0,1);
ctxSource.lineWidth = 10;
ctxSource.fillStyle = rgba(255,0,0,+a+);
ctxSource.moveTo(canvasWidth * arrRoundPosX[0], canvasHeight * arrRoundPosY[0]); //指定一条线段的起点
for(var i=1; i < arrRoundPosX.length; i++){
ctxSource.lineTo(canvasWidth * arrRoundPosX[i], canvasHeight * arrRoundPosY[i]); //指定一条线段的终点
}
ctxSource.lineTo(canvasWidth * arrRoundPosX[0], canvasHeight * arrRoundPosY[0]);
ctxSource.closePath();
ctxSource.fill();
ctxSource.restore();
ctxSource.save();
scaleCount++;
runCount++;
if(scaleCount % scaleInterval == 0){
scale += 0.1;
}
}
/**
* 设置标题和图片的长宽高和跳动频率
*/
function start(){
$(#monitor_list_box).width = canvasWidth + px;
$(#monitor_list_box).height = canvasHeight + px;
$(#canvasBackground).width = canvasWidth + px;
$(#canvasBackground).height = canvasHeight + px;
$(#canvasSource).width = canvasWidth + px;
$(#canvasSource).height = canvasHeight + px;
window.setInterval(loop,1000/30); //60帧
}
</script>
<style type=text/css>
#monitor_list_box {width:100%; height:auto; overflow: auto;}
#monitor_list_box canvas {position:absolute;width:100%; height:auto;}
</style>
<body>
<div id=monitor_list_box>
<canvas id=canvasBackground>
Your browser does not support the canvas element.
</canvas>
<canvas id=canvasSource>
Your browser does not support the canvas element.
</canvas>
</div>
</body>
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