<!DOCTYPE html>
<html lang="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<head>
<title>最低库存量/最高库存量计算</title>
</head>
<body onload="draw()">
<canvas id="myCanvus" width="1240px" height="240px" style="border:1px dashed black;">
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</canvas>
</body>
</html>
<script type="text/javascript">
<!--
function draw(){
var canvas=document.getElementById("myCanvus");
var canvasWidth=1240;
var canvasHeight=240;
var context=canvas.getContext("2d");
context.fillStyle = "white";
context.fillRect(0, 0, canvasWidth, canvasHeight);
context.strokeStyle = "black";
context.fillStyle = "black";
context.save();
// 进行坐标变换：把原点放在左下角，东方为X轴正向，北方为Y轴正向
var offset=20;// 偏移值，用来画坐标轴
context.save();
context.translate(0+offset,canvasHeight-offset);
context.rotate(getRad(180));
context.scale(-1,1);
drawAxisX(context,canvasWidth-40);
drawAxisY(context);
// 出库数据,这是主动数据
var outbounds=[0,70,0,70,0,60,0,60,0,70,0,70,0,70,0,70,0,70,0,70,0,70,0,70,];
var daysales=0;// 日销售量
var sum=0;
// 日销售量=出库数据均值
for(var i=0;i<outbounds.length;i++){
sum+=outbounds[i];
}
daysales=sum/outbounds.length;
console.log("日销售量="+daysales);
// 零件对象，固有属性数据
var piece=new Object();
piece.actualStock=100;// 当前实际库存量，单位个
piece.leadtime=1;// 到货天数，单位天
piece.safeday=0.5;// 安全系数，单位天
piece.supplyGap=2;//供应间隔日数，单位天
piece.reorganizeDay=2;//整理准备日数，单位天
// 最低库存量
var minStorage=daysales*(piece.leadtime+piece.safeday);
console.log("最低库存量="+minStorage);
// 最高库存量
var maxStorage=daysales*(piece.supplyGap+piece.reorganizeDay+piece.safeday);
console.log("最高库存量="+maxStorage);
// 入库数据,这是被动数据
var inbounds=[50,0,50,0,50,0,50,0,50,0,90,0,90,0,90,0,90,0,40,0,60,0,70,0,];
drawStockCurve(context,piece.actualStock,inbounds,outbounds,minStorage,maxStorage);
drawBounds(context,minStorage,maxStorage,canvasWidth-40);
context.restore();
context.fillText("每日库存变化折线,红点意味着低于安全库存，黄点意味着超储",400,50);
// 计算库存周转率
var outTotal=0;// 出库总金额
// 出库总金额=出库量累计
for(var i=0;i<outbounds.length;i++){
outTotal+=outbounds[i];
}
console.log("出库总金额="+outTotal);
// 总库存金额
var inStock=piece.actualStock;
sum=0;
for(var i=0;i<inbounds.length;i++){
inStock=inStock+inbounds[i]-outbounds[i];
sum+=inStock;
}
console.log("inStock="+inStock);
var inAvg=sum/inbounds.length;// 平均库存量/平均库存金额
console.log("平均库存金额="+inAvg);
var storageRate=outTotal/inAvg*100;
console.log("库存周转率="+storageRate);
context.fillText("库存周转率="+toCurrency(""+storageRate+"")+"%",1000,40);
context.fillText("库存",10,20);
context.fillText("日期",1200,235);
}
function drawBounds(ctx,minStorage,maxStorage,axisLength){
ctx.save();
ctx.lineWidth=0.5;
ctx.strokeStyle=‘red‘;
// 画underage
ctx.beginPath();
ctx.moveTo(0, minStorage);
ctx.lineTo(axisLength, minStorage);
ctx.stroke();
ctx.closePath();
ctx.save();
ctx.translate(-10,minStorage);
ctx.rotate(getRad(180));
ctx.scale(-1,1);
ctx.fillText("告罄",0,0);
ctx.restore();
ctx.restore();
ctx.save();
ctx.lineWidth=0.5;
ctx.strokeStyle=‘red‘;
// 画underage
ctx.beginPath();
ctx.moveTo(0, maxStorage);
ctx.lineTo(axisLength, maxStorage);
ctx.stroke();
ctx.closePath();
ctx.save();
ctx.translate(-10,maxStorage);
ctx.rotate(getRad(180));
ctx.scale(-1,1);
ctx.fillText("超储",0,0);
ctx.restore();
ctx.restore();
}
function drawStockCurve(ctx,actualStock,inbounds,outbounds,minStorage,maxStorage){
ctx.save();
ctx.lineWidth=1;
ctx.strokeStyle=‘black‘;
ctx.fillStyle=‘black‘;
var y=actualStock;
var x;
ctx.beginPath();
for(var i=0;i<inbounds.length;i++){
y=y+inbounds[i]-outbounds[i];
x=i*50;
ctx.lineTo(x, y);
ctx.save();
// 因坐标变换会导致文字错位，故采用位移+旋转+缩放的方式恢复
ctx.translate(x,y);
ctx.rotate(getRad(180));
ctx.scale(-1,1);
ctx.fillText("("+i+","+y+")",0,0);
ctx.restore();
}
ctx.stroke();
ctx.closePath();
// 2
y=actualStock;
x=0;
for(var i=0;i<inbounds.length;i++){
y=y+inbounds[i]-outbounds[i];
x=i*50;
ctx.lineTo(x, y);
if(y>maxStorage){
ctx.beginPath();
ctx.strokeStyle=‘yellow‘;
ctx.arc(x,y,5,0,Math.PI*2,false);
ctx.stroke();
ctx.closePath();
}
if(y<minStorage){
ctx.beginPath();
ctx.strokeStyle=‘red‘;
ctx.arc(x,y,3,0,Math.PI*2,false);
ctx.stroke();
ctx.closePath();
}
}
ctx.restore();
}
function drawAxisX(ctx,axisLength){
ctx.save();
ctx.lineWidth=0.5;
ctx.strokeStyle=‘navy‘;
ctx.fillStyle=‘navy‘;
// 画轴
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(axisLength, 0);
ctx.stroke();
ctx.closePath();
ctx.beginPath();
ctx.moveTo(axisLength-Math.cos(getRad(15))*10, Math.sin(getRad(15))*10);
ctx.lineTo(axisLength, 0);
ctx.lineTo(axisLength-Math.cos(getRad(15))*10, -Math.sin(getRad(15))*10);
ctx.stroke();
ctx.closePath();
// 画刻度
var x,y;
y=5;
for(x=50;x<axisLength;x+=50){
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, y);
ctx.stroke();
ctx.closePath();
}
// 写文字
var i=0;
for(x=0;x<axisLength;x+=50){
ctx.save();
ctx.scale(1,-1);
ctx.fillText(i,x,y+10);
ctx.restore();
i++;
}
ctx.restore();
}
function drawAxisY(ctx){
ctx.save();
ctx.lineWidth=0.5;
ctx.strokeStyle=‘navy‘;
ctx.fillStyle=‘navy‘;
// 画轴
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(0, 200);
ctx.stroke();
ctx.closePath();
ctx.beginPath();
ctx.moveTo(Math.sin(getRad(15))*10, 200-Math.cos(getRad(15))*10);
ctx.lineTo(0, 200);
ctx.lineTo(-Math.sin(getRad(15))*10, 200-Math.cos(getRad(15))*10);
ctx.stroke();
ctx.closePath();
// 画刻度
var x,y;
x=5;
for(y=50;y<200;y+=50){
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(0, y);
ctx.stroke();
ctx.closePath();
}
// 写文字
x=-19;
for(y=50;y<200;y+=50){
ctx.save();
ctx.scale(1,-1);
ctx.translate(0,-200);
ctx.fillText(200-y,x,y);
ctx.restore();
}
ctx.restore();
}
function getRad(degree){
return degree/180*Math.PI;
}
function toCurrency(money) {
if (/[^0-9\.]/.test(money)){
return ‘0.00‘;
}
money = money.replace(/^(\d*)$/, "$1.");
money = (money + "00").replace(/(\d*\.\d\d)\d*/, "$1");
money = money.replace(".", ",");
var re = /(\d)(\d{3},)/;
while (re.test(money)) {
money = money.replace(re, "$1,$2");
}
money = money.replace(/,(\d\d)$/, ".$1");
return ‘‘ + money.replace(/^\./, "0.")+" ";
}
//-->
</script>
时间： 2024-10-28 16:37:29