<!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;"> 出现文字表示你的浏览器不支持HTML5 </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>
本文转自张昺华-sky博客园博客，原文链接：http://www.cnblogs.com/xiandedanteng/p/7595840.html，如需转载请自行联系原作者
