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這篇文章主要介紹了用canvas畫出一個路線圖的方法，具有一定借鑒價值，需要的朋友可以參考下。希望大家閱讀完這篇文章后大有收獲。下面讓小編帶著大家一起了解一下。
<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反向尋車</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"> //設置路線中點的橫坐標和縱坐標的集合
arrPosX.push(<s:property value="posX" />);
arrPosY.push(<s:property value="posY" />);
</s:iterator>
var arrRoundPosX = [], arrRoundPosY = []; //設置終點所在區域的范圍點橫坐標和縱坐標集合
<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 = [ //設置起點圖標
"<%=basePath%>img/point_start.png",
];
var imgObjArr = [];
var iLoadIndex = 0;
/**
* 將圖標放入集合中
*/
function loadIconImages(){
var oImg = new Image();
oImg.addEventListener('load', eventIconImagesLoaded, false);
oImg.src = tmpIconPaths[iLoadIndex];
imgObjArr.push(oImg);
}
/**
* 加載圖標
*/
function eventIconImagesLoaded(){
iLoadIndex++;
if(iLoadIndex <= 3) {
loadIconImages();
} else {
loadImage();
}
}
/**
* 加載背景圖標
*/
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;
}
/**
* 初始化畫布
*/
function initScene() {
ctxBackground.drawImage(areaImage, 0, 0, canvasWidth, canvasHeight);
}
/**
* 開始繪圖
*/
function initSprits() {
/* 繪制路線的白底 */
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]); //指定一條線段的起點
ctxBackground.lineTo(canvasWidth * arrPosX[i], canvasHeight * arrPosY[i]); //指定一條線段的終點
}
ctxBackground.stroke();
/* 繪制路線的紅線 */
ctxBackground.beginPath(); //是通過覆蓋白底實現的
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]); //指定一條線段的起點
ctxBackground.lineTo(canvasWidth * arrPosX[i], canvasHeight * arrPosY[i]); //指定一條線段的終點
}
ctxBackground.stroke();
/* 繪制終點區域 */
ctxSource.clearRect(0, 0, canvasWidth,canvasHeight);
ctxBackground.beginPath();
ctxBackground.strokeStyle = "rgba(255,0,0,1)"; //顏色
ctxBackground.lineWidth = 0.5;
ctxBackground.fillStyle = "rgba(255,0,0,0)"; //透明度
ctxBackground.moveTo(canvasWidth * arrRoundPosX[0], canvasHeight * arrRoundPosY[0]); //指定一條線段的起點
for(var i=1; i < arrRoundPosX.length; i++){
ctxBackground.lineTo(canvasWidth * arrRoundPosX[i], canvasHeight * arrRoundPosY[i]); //指定一條線段的終點
}
ctxBackground.lineTo(canvasWidth * arrRoundPosX[0], canvasHeight * arrRoundPosY[0]);
ctxBackground.closePath();
ctxBackground.fill();
ctxBackground.stroke();
/* 繪制起點圖標 */
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);
}
/**
* 設置圖標的跳動
*/
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);
/* 設置起點圖標的跳動 */
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; // 陰影x軸偏移
ctxSource.shadowOffsetY = 4; // 陰影y軸偏移
ctxSource.shadowBlur = 2; // 模糊尺寸
ctxSource.shadowColor = 'rgba(0, 0, 0, 0.5)'; // 顏色
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();
/* 設置終點區域的透明度變化 */
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]); //指定一條線段的起點
for(var i=1; i < arrRoundPosX.length; i++){
ctxSource.lineTo(canvasWidth * arrRoundPosX[i], canvasHeight * arrRoundPosY[i]); //指定一條線段的終點
}
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;
}
}
/**
* 設置標題和圖片的長寬高和跳動頻率
*/
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幀
}
</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>感謝你能夠認真閱讀完這篇文章，希望小編分享用canvas畫出一個路線圖的方法內容對大家有幫助，同時也希望大家多多支持億速云，關注億速云行業資訊頻道，遇到問題就找億速云，詳細的解決方法等著你來學習!
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