var dangle=22,rise=4.848,RAD=180/Math.PI;function SetCalc(){Calculate();SetNumeric();if(document.getElementById("sldr").type=="range")document.getElementById("sldr").style.display="block"}
function Calculate(){var b;if(document.getElementById("rbAngle").checked){dangle=parseFloat(document.getElementById("_txtAngle").value);if(isNaN(dangle)||dangle<0||dangle>60){alert("Please enter an angle between 0 and 60");return}b=dangle/RAD}else{rise=parseFloat(document.getElementById("_txtAngle").value);if(isNaN(rise)||rise<0||rise>19.2){alert("Please enter a Rise between 0 and 19.2");return}b=Math.atan(rise/12);dangle=b*RAD}var g=parseFloat(document.getElementById("txtCentersLevel").value);if(isNaN(g)||
g<50||g>1E4)alert("Please enter a Centres between 50 and 10000");else{var i=parseFloat(document.getElementById("txtLevelLength").value);if(isNaN(i)||i<100||i>1E5)alert("Please enter a Length between 100 and 100000");else{var e=parseFloat(document.getElementById("txtCentrseStartLevel").value);if(isNaN(e)||e<0||e>1E5)alert("Please enter a Start Point between 0 and 100000");else{var k=g/Math.cos(b),j=e==0?k:e/Math.cos(b),f=j;document.getElementById("spnCentersAngle").innerHTML="Centres at "+RoundTo(dangle,
2)+"&deg; "+Math.round(k)+" mm";var d=i/Math.cos(b);document.getElementById("spnLengthAngle").innerHTML="Length  at "+RoundTo(dangle,2)+"&deg; "+Math.round(d)+" mm";for(var h="";f<=d+1;){h+=Math.round(f)+", ";f+=k}h=h.substring(0,h.length-2);document.getElementById("spnCentersAngleRun").innerHTML="Running Centres at "+RoundTo(dangle,2)+"&deg;<br />"+h;var c=document.getElementById("cnvsCenters");if(c.getContext){b=Math.tan(b);f=c.width-40;d=b*f;c.setAttribute("height",d+120);h=f/(i/g);d+=60;f+=20;
var a=c.getContext("2d");a.clearRect(0,0,c.width,c.height);a.fillStyle="#00f";a.beginPath();a.moveTo(20,d);a.lineTo(f,60);a.lineTo(f,d);a.closePath();a.fillStyle="#dcdcdc";a.save();a.shadowOffsetY=8;a.shadowOffsetX=8;a.shadowBlur=8;a.shadowColor="#c0c0c0";a.fill();a.restore();c=e==0?20+h:20+f/(i/e);e=e==0?g:e;j=j;a.textBaseline="top";a.font="12px Verdana";a.fillStyle="#f00";for(a.beginPath();c<f+1;){a.moveTo(c,d);a.lineTo(c,d-b*(c-20));a.save();a.fillStyle="#000";disp=Math.round(e);a.translate(c+
6,d+4);a.rotate(90/RAD);a.fillText(disp,0,0);a.restore();disp=Math.round(j);sz=a.measureText(disp).width;a.save();a.translate(c+6,d-b*c-sz);a.rotate(90/RAD);a.fillText(disp,0,0);a.restore();e+=g;j+=k;c+=h}a.stroke();a.fillStyle="#00f";a.fillText(RoundTo(dangle,1)+"\u00b0",0,d-12);a.save();disp=Math.round(b*i);a.translate(f+20,d/2+20);a.rotate(90/RAD);a.fillText(disp,0,0);a.restore()}}}}}
function SetType(){if(document.getElementById("rbRise").checked){document.getElementById("spnAngle").innerHTML=" in 12";document.getElementById("divAuto").style.display="none";rise=Math.tan(dangle/RAD)*12;document.getElementById("_txtAngle").value=RoundTo(rise,2)}else{document.getElementById("spnAngle").innerHTML="&deg;";document.getElementById("divAuto").style.display="block";dangle=Math.atan(rise/12)*RAD;document.getElementById("_txtAngle").value=RoundTo(dangle,2)}}
function sldr_onchange(b){document.getElementById("_txtAngle").value=RoundTo(b.value,1);Calculate()}var autoTimer=null;function StartAuto(b){autoTimer=setInterval("Auto("+b+")",100)}function Auto(b){b=parseInt(document.getElementById("_txtAngle").value)+b;if(b>-1&&b<60){document.getElementById("_txtAngle").value=b;document.getElementById("sldr").value=b;Calculate()}}function StopAuto(){clearInterval(autoTimer)}var sizeTimer;function Resize(b){sizeTimer=setInterval("Sizer("+b+")",100)}
function Sizer(b){var g=document.getElementById("cnvsCenters");b=parseInt(g.width)+b;if(b>100&&b<1E3){g.setAttribute("width",b);Calculate()}else StopSizer()}function StopSizer(){clearInterval(sizeTimer)};