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drawSC.js
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var width = 600;
var height = 600;
var r = 300;
var c;
var zlr=0.0;
var zli=0.0;
var z0=0.0;
var cx=0;var cy=0;
var vswrval = 0.0;
var zinr=0;var zini=0;
window.addEventListener('load',function(){
document.getElementById("about").addEventListener("mouseover",change_a1);
document.getElementById("about").addEventListener("mouseout",change_a2);
document.getElementById("credit").addEventListener("mouseover",change_cr1);
document.getElementById("credit").addEventListener("mouseout",change_cr2);
document.getElementById("contact").addEventListener("mouseover",change_co1);
document.getElementById("contact").addEventListener("mouseout",change_co2);
document.getElementById('calc').addEventListener("click",calculate);
document.getElementById('plot').addEventListener("click",plot);
document.getElementById('circ_plot').addEventListener("click",circ_calc);
document.getElementById('admittance').addEventListener("click",draw_admit);
document.getElementById('impedance').addEventListener("click",draw_imp);
setC();
setgrad();
draw_imp();
});
function change_a1(){document.getElementById("im1").src = "img/bulb2.png";}
function change_a2(){document.getElementById("im1").src = "img/bulb1.png";}
function change_cr1(){document.getElementById("im2").src = "img/credit2.png";}
function change_cr2(){document.getElementById("im2").src = "img/credit1.png";}
function change_co1(){document.getElementById("im3").src = "img/mail2.png";}
function change_co2(){document.getElementById("im3").src = "img/mail1.png";}
function circ_plot(){
var zinrr =zinr/50;var zinii=zini/50;
var zinX = (1+ir2x(zinrr, zinii))*width/2;
var zinY = (1-ir2y(zinrr, zinii))*height/2;
var ctx = c.getContext("2d");
ctx.strokeStyle = "green";
ctx.beginPath();
ctx.arc(zinX,zinY,2,0,2*Math.PI);
ctx.stroke();
// ctx.moveTo(zinX-7,zinY);
// ctx.lineTo(zinX+7,zinY);
// ctx.stroke();
// ctx.moveTo(zinX,zinY-7);
// ctx.lineTo(zinX,zinY+7);
// ctx.stroke();
}
function circ_calc(){
var z1 = document.getElementById('z1').value;
var z2 = document.getElementById('z2').value;
var z3 = document.getElementById('z3').value;
var ZinrP = document.getElementById('zinr');
var ZiniP = document.getElementById('zini');
var Lr = document.getElementById('loadr').value;
var Li = document.getElementById('loadi').value;
var f1 = document.getElementById('freq1').value;
var f2 = document.getElementById('freq2').value;
var z1temp = document.getElementById('z1s');
var z1s = z1temp.options[z1temp.selectedIndex].text;
var z2temp = document.getElementById('z2s');
var z2s = z2temp.options[z2temp.selectedIndex].text;
var z3temp = document.getElementById('z3s');
var z3s = z3temp.options[z3temp.selectedIndex].text;
var inc = (f2-f1)/199;
for(var f=f1;f<=f2;f = f+inc)
{
var w = (2*Math.PI*f*1000*1000*1000);
var Z2r=0,Z1r=0,Z3r=0;
var Z2i=0,Z1i=0,Z3i=0;
if(z2s == 'R(ohm)'){
Z2r = z2;
}
else if(z2s == 'L(nH)'){
Z2i = w*z2*Math.pow(10,-9);
}
else if(z2s == 'C(pF)'){
Z2i = 1/(w*z2*Math.pow(10,-12));
}
if(z3s == 'R(ohm)'){
Z3r = z3;
}
else if(z3s == 'L(nH)'){
Z3i = w*z3*Math.pow(10,-9);
}
else if(z3s == 'C(pF)'){
Z3i = 1/(w*z3*Math.pow(10,-12));
}
if(z1s == 'R(ohm)'){
Z1r = z1;
}
else if(z1s == 'L(nH)'){
Z1i = w*z1*Math.pow(10,-9);
}
else if(z1s == 'C(pF)'){
Z1i = 1/(w*z1*Math.pow(10,-12));
}
var xr = Number(Z2r)+Number(Lr);
var xi = Number(Z2i)+Number(Li);
var yr = (Number((Number(Z3r*xr)-Number(Z3i*xi))*(Number(Z3r)+Number(xr)))+Number((Number(Z3i*xr)+Number(xi*Z3r))*(Number(Z3i)+Number(xi))))/(Math.pow(Number(Z3r)+Number(xr),2)+Math.pow(Number(Z3i)+Number(xi),2));
var yi = (Number((Number(Z3i*xr)+Number(xi*Z3r))*(Number(Z3r)+Number(xr)))-Number((Number(Z3r*xr)-Number(Z3i*xi))*(Number(Z3i)+Number(xi))))/(Math.pow(Number(Z3r)+Number(xr),2)+Math.pow(Number(Z3i)+Number(xi),2));
zinr = Number(Z1r)+Number(yr);
zini = Number(Z1i)+Number(yi);
f = Number(f) + Number(inc);
circ_plot();
}
ZinrP.innerHTML = Number(zinr).toFixed(1);
ZiniP.innerHTML = Number(zini).toFixed(1);
}
function plot(){
var val = (width/2)*(ir2x(vswrval,0));
var ctx = c.getContext("2d");
ctx.strokeStyle = "blue";
ctx.beginPath();
ctx.arc(width/2,height/2,val,0,2*Math.PI);
ctx.stroke();
}
function calculate(){
zlr = document.getElementById('zlr').value;
zli = document.getElementById('zli').value;
z0 = document.getElementById('z0').value;
var ref_rval = ((Math.pow(zlr-1,2)-Math.pow(zli,2))/(Math.pow(zlr+1,2)+Math.pow(zli,2)));
var ref_ival = ((2*(zlr-1)*zli)/(Math.pow(zlr+1,2)+Math.pow(zli,2)));
var mg1 =Math.sqrt(Math.pow((zlr - z0),2)+Math.pow(zli,2));
var mg2 = Math.sqrt(Math.pow(Number(zlr)+Number(z0),2)+Math.pow(zli,2));
var modGama = mg1/mg2;
var phase = (Math.atan(ref_ival/ref_rval));
vswrval = (1+modGama)/(1-modGama);
document.getElementById('vswr').innerHTML = vswrval.toFixed(2);
document.getElementById('rcmag').innerHTML = modGama.toFixed(2);
document.getElementById('rcphase').innerHTML = phase.toFixed(2);
}
function setC(){
c = document.getElementById("chart");
c.addEventListener("mousedown",pressed,false);
c.width = width;
c.height = height;
}
function setgrad(){
var ctx = c.getContext("2d");
var grad = ctx.createLinearGradient(0,600,0,0);
grad.addColorStop(0,"#99e6ff");
grad.addColorStop(1,"white");
ctx.fillStyle = grad;
ctx.fillRect(0,0,600,600);
}
function draw_imp(){
var ctx = c.getContext("2d");
ctx.strokeStyle = "#ffffff";
ctx.fillRect(0,0,600,600);
ctx.strokeStyle = "#000000";
//Draw constant r circles
cx = width; cy = height/2; r = 0;
for (var i =1;i <7;i=i+0.5)
{
ctx.beginPath();
ctx.arc(cx,cy,r,0,2*Math.PI);
ctx.stroke();
cx = cx - Math.pow(2,i);
r = (width - cx);
}
//Draw circle passing through center
cx = width*3/4;cy = width/2;r=width/4;
ctx.beginPath();
ctx.arc(cx,cy,r,0,2*Math.PI);
ctx.strokeStyle = "#ff0000";
ctx.stroke();
//Draw constant i circles +ve axis
ctx.strokeStyle = "#000000";
cx = width;cy=height/2;r=0;
for (var i =1;i <10;i=i+1)
{
cy = cy - Math.pow(2,i);
r = (height/2-cy);
ctx.beginPath();
ctx.arc(cx,cy,r,Math.PI/2,Math.PI/2+(2*Math.atan(width/(2*r))));
ctx.stroke();
}
//Draw constant i circles -ve axis
cx = width;cy=height/2;r=0;
for (var i =1;i <10;i=i+1)
{
cy = cy + Math.pow(2,i);
r = (cy-height/2);
ctx.beginPath();
ctx.arc(cx,cy,r,(3*Math.PI/2)-(2*Math.atan(width/(2*r))),3*Math.PI/2);
ctx.stroke();
}
//Draw outer most circle in red
ctx.strokeStyle = "#ff0000";
ctx.beginPath();
ctx.arc(width/2,height/2,width/2,0,2*Math.PI);
ctx.stroke();
//draw line in the middle
ctx.moveTo(0,width/2);
ctx.lineTo(width,width/2);
ctx.stroke();
}
function draw_admit(){
var ctx = c.getContext("2d");
ctx.strokeStyle = "#ffffff";
ctx.fillRect(0,0,600,600);
ctx.strokeStyle = "#000000";
//Draw constant r circles
cx = 0; cy = height/2; r = 0;
for (var i =1;i <7;i=i+0.5)
{
ctx.beginPath();
ctx.arc(cx,cy,r,0,2*Math.PI);
ctx.stroke();
cx = cx + Math.pow(2,i);
r = ( cx);
}
//Draw circle passing through center
cx = width*1/4;cy = width/2;r=width/4;
ctx.beginPath();
ctx.arc(cx,cy,r,0,2*Math.PI);
ctx.strokeStyle = "#ff0000";
ctx.stroke();
//Draw constant i circles +ve axis
ctx.strokeStyle = "#000000";
cx = 0;cy=height/2;r=0;
for (var i =1;i <10;i=i+1)
{
cy = cy - Math.pow(2,i);
r = (height/2-cy);
ctx.beginPath();
ctx.arc(cx,cy,r,Math.PI/2-(2*Math.atan(width/(2*r))),Math.PI/2);
ctx.stroke();
}
//Draw constant i circles -ve axis
cx = 0;cy=height/2;r=0;
for (var i =1;i <10;i=i+1)
{
cy = cy + Math.pow(2,i);
r = (cy-height/2);
ctx.beginPath();
ctx.arc(cx,cy,r,3*Math.PI/2,(3*Math.PI/2)+(2*Math.atan(width/(2*r))));
ctx.stroke();
}
//Draw outer most circle in red
ctx.strokeStyle = "#ff0000";
ctx.beginPath();
ctx.arc(width/2,height/2,width/2,0,2*Math.PI);
ctx.stroke();
//draw line in the middle
ctx.moveTo(0,width/2);
ctx.lineTo(width,width/2);
ctx.stroke();
}
var crn=width,cin=width/2;
function pressed(event){
var ctx2 = c.getContext("2d");
//lighten the previous line
ctx2.save();
ctx2.setLineDash([5]);
ctx2.strokeStyle = "#b3ffb3";
ctx2.beginPath();
ctx2.arc(crn,width/2,width-crn,0,2*Math.PI);
ctx2.stroke();
ctx2.beginPath();
if(cin<height/2) ctx2.arc(width,cin,(width/2)-cin,Math.PI/2,Math.PI/2+(2*Math.atan(width/(2*((width/2)-cin)))));
else ctx2.arc(width,cin,cin-width/2,(3*Math.PI/2)-(2*Math.atan(width/(2*(cin-width/2)))),3*Math.PI/2);
ctx2.stroke();
ctx2.restore();
//draw the new dashed line for the clicked area
var xm = event.pageX-10; // 10 is to offset mouse length
var ym = event.pageY-16;
crn = (Math.pow(xm,2)+Math.pow(ym-(width/2),2)-Math.pow(width,2))/(2*(xm-width));
cin = (Math.pow(xm-width,2)+Math.pow(ym,2)-Math.pow(height/2,2))/(2*(ym-height/2));
ctx2.save();
ctx2.setLineDash([5]);
ctx2.strokeStyle = "green";
ctx2.beginPath();
ctx2.arc(crn,width/2,width-crn,0,2*Math.PI);
ctx2.stroke();
ctx2.beginPath();
if(cin<height/2) ctx2.arc(width,cin,(width/2)-cin,Math.PI/2,Math.PI/2+(2*Math.atan(width/(2*((width/2)-cin)))));
else ctx2.arc(width,cin,cin-width/2,(3*Math.PI/2)-(2*Math.atan(width/(2*(cin-width/2)))),3*Math.PI/2);
ctx2.stroke();
ctx2.restore();
}
function showCoords(event) {
var xm = event.clientX-10; // 10 is to offset mouse length
var ym = event.clientY-16;
var rval = xy2r(xm,ym);
var ival = xy2i(xm,ym);
document.getElementById("rval").innerHTML = rval;
document.getElementById("ival").innerHTML = ival;
}
function clearCoor() {
document.getElementById("rval").innerHTML = "-";
document.getElementById("ival").innerHTML = "-";
}
function xy2r(x,y){
x = x/(width/2)-1;y=1-y/(height/2);
return (2*(1-x)/(Math.pow(x-1,2)+Math.pow(y,2))-1).toFixed(3);
}
function xy2i(x,y){
x = x/(width/2)-1;y=1-y/(height/2);
return (2*y/(Math.pow(x-1,2)+Math.pow(y,2))).toFixed(3);
}
function ir2x(rval,ival){
return (1-(2/((rval+1)*(1+(Math.pow(ival,2)/Math.pow(rval+1,2))))));
}
function ir2y(rval,ival){
return (ival*(2/((rval+1)*(1+(Math.pow(ival,2)/Math.pow(rval+1,2)))))/(rval+1));
}