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112 lines
2.4 KiB
112 lines
2.4 KiB
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function PolarFunction(txtFct){
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this.setFct = function(txt){
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this.fct = txt;
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this.f = new Function("t", "return "+this.fct);
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};
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if(txtFct){
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this.setFct(txtFct);
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}
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this.couleur = fct.couleur;
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this.width = document.getElementById("inputTaille").value;
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this.startAngle = 0;
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this.endAngle = 2*Math.PI;
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this.from = "0";
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this.to = "2*pi";
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this.style = document.getElementById("selectStyle").value;
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this.getX = function(t){
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var r = this.f(t);
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return r * Math.cos(t);
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};
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this.getY = function(t){
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var r = this.f(t);
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return r * Math.sin(t);
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};
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this.set = function(f){
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this.setFct(fct.remplacer(fct.verifier(f.fct)));
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this.couleur = f.couleur;
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this.width = f.width;
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this.style = f.style;
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this.from = f.from;
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this.to = f.to;
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this.startAngle = eval(fct.remplacer(fct.verifier(f.from)));
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this.endAngle = eval(fct.remplacer(fct.verifier(f.to)));
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return this;
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};
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this.get = function(){
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var f = {};
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f.type = "polar";
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f.fct = this.fct;
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f.couleur = this.couleur;
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f.width = this.width;
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f.style = this.style;
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f.from = this.from;
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f.to = this.to;
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return f;
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};
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this.readableText = function(){
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return "r(t) = " + this.fct;
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};
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this.setStartEnd = function(start, end){
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if(start > end){
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var tmp = start;
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start = end;
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end = start;
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}
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this.startAngle = start;
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this.endAngle = end;
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};
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this.plot = function(ctx, precision, affichage){
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if(this.style == "points"){
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precision *= 2;
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}
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ctx.beginPath();
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ctx.lineWidth = this.width;
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ctx.strokeStyle = this.couleur;
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ctx.fillStyle = this.couleur;
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notDefined = true;
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for(var t = this.startAngle; t <= this.endAngle; t+=precision){
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var r = this.f(t);
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if(!isNaN(r)){
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// Transform coordinates
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var x = r * Math.cos(t);
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var y = r * Math.sin(t);
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var pointX = (x - affichage.xGauche) * affichage.multX;
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var pointY = affichage.hauteur - (y - affichage.yBas) * affichage.multY;
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// Draw point
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if(notDefined){
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notDefined = false;
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ctx.moveTo(pointX, pointY);
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}
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else{
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if(this.style == "continu"){
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ctx.lineTo(pointX, pointY);
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}
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else if(this.style == "points"){
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ctx.beginPath();
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ctx.arc(pointX, pointY, this.width, 0, 2*Math.PI, true);
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ctx.fill();
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}
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else{
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ctx.lineTo(pointX, pointY);
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notDefined = true;
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}
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}
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}
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}
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if(this.style != "points"){
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ctx.stroke();
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}
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};
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}
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