found a section of code for drawing k-diagram from the Internet and changed it, and found that the effect is a little different from what you expected. Please take a look at
according to reason, as long as the mouse is moved into the drawing path, the cursor will be changed. What"s going on? ask for advice
paste code
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="chart" height="500" width="1200" style="margin:30px;"></div>
<script type="text/javascript">
function goChart(cBox, dataArr){
//
var canvas,ctx;
//
var cWidth, cHeight, cMargin, cSpace;
var originX, originY;
//
var bMargin, tobalBars, bWidth, maxValue, minValue;
var totalYNomber;
var gradient;
var showArr;
//
var dragBarX,dragBarWidth;
//
var ctr, numctr, speed;
//
var mousePosition = {};
// canvascanvas
canvas = document.createElement("canvas");
if(canvas && canvas.getContext){
ctx = canvas.getContext("2d");
}
canvas.innerHTML = "HTML5 canvas";
cBox.appendChild(canvas);
initChart(); //
drawLineLabelMarkers(); //
drawBarAnimate(); //
//
var mouseTimer = null;
addMouseMove();
function addMouseMove(){
canvas.addEventListener("mousemove",function(e){
e = e || window.event;
if( e.offsetX || e.offsetX==0 ){
mousePosition.x = e.offsetX;
mousePosition.y = e.offsetY;
}else if( e.layerX || e.layerX==0 ){
mousePosition.x = e.layerX;
mousePosition.y = e.layerY;
}
mouseTimer = setTimeout(function(){
ctx.clearRect(0,0,canvas.width, canvas.height);
drawLineLabelMarkers();
drawBarAnimate(true);
drawDragBar();
},10);
});
}
//
function initChart(){
//
cMargin = 60;
cSpace = 80;
//canvas2
canvas.width = cBox.getAttribute("width")* 2 ;
canvas.height = cBox.getAttribute("height")* 2;
canvas.style.height = canvas.height/2 + "px";
canvas.style.width = canvas.width/2 + "px";
cHeight = canvas.height - cMargin*2-cSpace*2;
cWidth = canvas.width - cMargin*2-cSpace*2;
originX = cMargin + cSpace;
originY = cMargin + cHeight;
showArr = dataArr.slice( 0,parseInt(dataArr.length/2) );
//
tobalBars = showArr.length;
bWidth = parseInt( cWidth/tobalBars/3);
bMargin = parseInt( (cWidth-bWidth*tobalBars)/(tobalBars+1) );
maxValue = 0;
minValue = 9999999;
for(var i=0; i<dataArr.length; iPP){
var barVal = dataArr[i][1][3] ;
if( barVal > maxValue ){
maxValue = barVal;
}
var barVal2 = dataArr[i][1][2] ;
if( barVal2 < minValue ){
minValue = barVal2;
}
}
maxValue += 20;
minValue -= 20;
totalYNomber = 10;
//
ctr = 1;
numctr = 50;
speed = 2;
dragBarWidth = 30;
dragBarX = cWidth/2+cSpace+cMargin-dragBarWidth/2;
}
//
function drawLineLabelMarkers(){
ctx.font = "24px Arial";
ctx.lineWidth = 2;
ctx.fillStyle = "-sharp000";
ctx.strokeStyle = "-sharp000";
// y
drawLine(originX, originY, originX, cMargin);
// x
drawLine(originX, originY, originX+cWidth, originY);
//
drawMarkers();
}
//
function drawLine(x, y, X, Y){
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(X, Y);
ctx.stroke();
ctx.closePath();
}
//
function drawMarkers(){
ctx.strokeStyle = "-sharpE0E0E0";
// y
var oneVal = (maxValue-minValue)/totalYNomber;
ctx.textAlign = "right";
for(var i=0; i<=totalYNomber; iPP){
var markerVal = parseInt(i*oneVal+minValue);;
var xMarker = originX-10;
var yMarker = parseInt( originY-cHeight*(markerVal-minValue)/(maxValue-minValue) );
ctx.fillText(markerVal, xMarker, yMarker+3, cSpace); //
if(i>0){
drawLine(originX+2, yMarker, originX+cWidth, yMarker);
}
}
// x
var textNb = 6;
ctx.textAlign = "center";
for(var i=0; i<tobalBars; iPP){
if(tobalBars>textNb && i%parseInt(tobalBars/6) != 0 ){
continue;
}
var markerVal = dataArr[i][0];
var xMarker = parseInt( originX+cWidth*(i/tobalBars)+bMargin+bWidth/2 );
var yMarker = originY+30;
ctx.fillText(markerVal, xMarker, yMarker, cSpace); //
}
// y
ctx.save();
ctx.rotate(-Math.PI/2);
ctx.fillText(" ", -canvas.height/2, cSpace-20);
ctx.restore();
// x
ctx.fillText(" ", originX+cWidth/2, originY+cSpace-20);
};
//
function drawBarAnimate(mouseMove){
var parsent = ctr/numctr;
for(var i=0; i<tobalBars; iPP){
var oneVal = parseInt(maxValue/totalYNomber);
var data = dataArr[i][1];
var color = "-sharp30C7C9";
var barVal = data[0];
var disY = 0;
//0 1 2 3 30C7C9 D7797F
if(data[1]>data[0]){ //
color = "-sharpD7797F";
barVal = data[1];
disY = data[1]-data[0];
}else{
disY = data[0]-data[1];
}
var showH = disY/(maxValue-minValue)*cHeight*parsent;
showH = showH>2 ? showH : 2 ;
var barH = parseInt( cHeight*(barVal-minValue)/(maxValue-minValue));
var y = originY - barH;
var x = originX + ((bWidth+bMargin)*i + bMargin)*parsent;
drawRect( x, y, bWidth, showH, mouseMove, color,true); // x
//
showH = (data[3]-data[2])/(maxValue-minValue)*cHeight*parsent;
showH = showH>2 ? showH : 2 ;
y = originY - parseInt( cHeight*(data[3]-minValue)/(maxValue-minValue));
drawRect( parseInt(x+bWidth/2-1), y, 2, showH, mouseMove, color); // x
}
if(ctr<numctr){
ctrPP;
setTimeout(function(){
ctx.clearRect(0,0,canvas.width, canvas.height);
drawLineLabelMarkers();
drawBarAnimate();
drawDragBar();
}, speed*=0.03);
}
}
//
function drawRect( x, y, X, Y, mouseMove , color){
ctx.beginPath();
if( parseInt(x)%2 !== 0){
x += 1;
}
if( parseInt(y)%2 !== 0){
y += 1;
}if( parseInt(X)%2 !== 0){
X += 1;
}
if( parseInt(Y)%2 !== 0){
Y += 1;
}
ctx.rect( parseInt(x), parseInt(y), parseInt(X), parseInt(Y) );
//
if(ctx.isPointInPath(mousePosition.x*2, mousePosition.y*2)){
canvas.style.cursor = "all-scroll";
}else
canvas.style.cursor = "default";
ctx.fillStyle = color;
ctx.fill();
}
//
drawDragBar();
function drawDragBar(){
drawRect( originX, originY+cSpace, cWidth, cMargin, false, "-sharpE8E4F0");
drawRect( originX, originY+cSpace, dragBarX-originX, cMargin, false, "-sharpBCCEF5");
drawRect( dragBarX, originY+cSpace, dragBarWidth, cMargin, false, "-sharp078ACB",false,true);
}
//
canvas.onmousedown = function(e){
if(canvas.style.cursor != "all-scroll"){
return false;
}
document.onmousemove = function(e){
e = e || window.event;
if( e.offsetX || e.offsetX==0 ){
dragBarX = e.offsetX*2-dragBarWidth/2;
}else if( e.layerX || e.layerX==0 ){
dragBarX = e.layerX*2-dragBarWidth/2;
}
if(dragBarX<=originX){
dragBarX=originX
}
if(dragBarX>originX+cWidth-dragBarWidth){
dragBarX=originX+cWidth-dragBarWidth
}
var nb = Math.ceil( dataArr.length*( (dragBarX-cMargin-cSpace)/cWidth ) );
showArr = dataArr.slice( 0, nb || 1 );
//
tobalBars = showArr.length;
bWidth = parseInt( cWidth/tobalBars/3);
bMargin = parseInt( (cWidth-bWidth*tobalBars)/(tobalBars+1) );
}
document.onmouseup = function(){
document.onmousemove = null;
document.onmouseup = null;
}
}
}
//
var dataArr = [
["2017/10/1", [2320.26,2302.6,2287.3,2362.94]],
["2017/10/2", [2300,2291.3,2288.26,2308.38]],
["2017/10/3", [2295.35,2346.5,2295.35,2346.92]],
["2017/10/4", [2347.22,2358.98,2337.35,2363.8]],
["2017/10/5", [2360.75,2382.48,2347.89,2383.76]],
["2017/10/6", [2383.43,2385.42,2371.23,2391.82]],
["2017/10/7", [2377.41,2419.02,2369.57,2421.15]],
["2017/10/8", [2425.92,2428.15,2417.58,2440.38]],
["2017/10/9", [2411,2433.13,2403.3,2437.42]],
["2017/10/10", [2432.68,2434.48,2427.7,2441.73]],
["2017/10/11", [2430.69,2418.53,2394.22,2433.89]],
["2017/10/12", [2416.62,2432.4,2414.4,2443.03]],
["2017/10/13", [2441.91,2421.56,2415.43,2444.8]],
["2017/10/14", [2420.26,2382.91,2373.53,2427.07]],
["2017/10/15", [2383.49,2397.18,2370.61,2397.94]],
["2017/10/16", [2378.82,2325.95,2309.17,2378.82]],
["2017/10/17", [2322.94,2314.16,2308.76,2330.88]],
["2017/10/18", [2320.62,2325.82,2315.01,2338.78]],
["2017/10/19", [2313.74,2293.34,2289.89,2340.71]],
["2017/10/20", [2297.77,2313.22,2292.03,2324.63]],
["2017/10/21", [2322.32,2365.59,2308.92,2366.16]],
["2017/10/22", [2364.54,2359.51,2330.86,2369.65]],
["2017/10/23", [2332.08,2273.4,2259.25,2333.54]],
["2017/10/24", [2274.81,2326.31,2270.1,2328.14]],
["2017/10/25", [2333.61,2347.18,2321.6,2351.44]],
["2017/10/26", [2340.44,2324.29,2304.27,2352.02]],
["2017/10/27", [2326.42,2318.61,2314.59,2333.67]],
["2017/10/28", [2314.68,2310.59,2296.58,2320.96]],
["2017/10/29", [2309.16,2286.6,2264.83,2333.29]],
["2017/10/30", [2282.17,2263.97,2253.25,2286.33]],
["2017/11/1", [2320.26,2302.6,2287.3,2362.94]],
["2017/11/2", [2300,2291.3,2288.26,2308.38]],
["2017/11/3", [2295.35,2346.5,2295.35,2346.92]],
["2017/11/4", [2347.22,2358.98,2337.35,2363.8]],
["2017/11/5", [2360.75,2382.48,2347.89,2383.76]],
["2017/11/6", [2383.43,2385.42,2371.23,2391.82]],
["2017/11/7", [2377.41,2419.02,2369.57,2421.15]],
["2017/11/8", [2425.92,2428.15,2417.58,2440.38]],
["2017/11/9", [2411,2433.13,2403.3,2437.42]],
["2017/11/10", [2432.68,2434.48,2427.7,2441.73]],
["2017/11/11", [2430.69,2418.53,2394.22,2433.89]],
["2017/11/12", [2416.62,2432.4,2414.4,2443.03]],
["2017/11/13", [2441.91,2421.56,2415.43,2444.8]],
["2017/11/14", [2420.26,2382.91,2373.53,2427.07]],
["2017/11/15", [2383.49,2397.18,2370.61,2397.94]],
["2017/11/16", [2378.82,2325.95,2309.17,2378.82]],
["2017/11/17", [2322.94,2314.16,2308.76,2330.88]],
["2017/11/18", [2320.62,2325.82,2315.01,2338.78]],
["2017/11/19", [2313.74,2293.34,2289.89,2340.71]],
["2017/11/20", [2297.77,2313.22,2292.03,2324.63]],
["2017/11/21", [2322.32,2365.59,2308.92,2366.16]],
["2017/11/22", [2364.54,2359.51,2330.86,2369.65]],
["2017/11/23", [2332.08,2273.4,2259.25,2333.54]],
["2017/11/24", [2274.81,2326.31,2270.1,2328.14]],
["2017/11/25", [2333.61,2347.18,2321.6,2351.44]],
["2017/11/26", [2340.44,2324.29,2304.27,2352.02]],
["2017/11/27", [2326.42,2318.61,2314.59,2333.67]],
["2017/11/28", [2314.68,2310.59,2296.58,2320.96]],
["2017/11/29", [2309.16,2286.6,2264.83,2333.29]],
["2017/11/30", [2282.17,2263.97,2253.25,2286.33]]
];
goChart(document.getElementById("chart"),dataArr);
</script>
</body>
</html>