本文主要包含canvas画出等相关知识,匿名希望在学习及工作中可以帮助到您
本篇文章给大家带来的内容是关于如何用canvas画出一个路线图（代码），有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。
<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);