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433 lines
15 KiB
433 lines
15 KiB
13 years ago
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// ------------------ SVG et canvas ------------------
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// Cette fonction calcule tous les points de la fonction mathématique.
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// Elle place chaque coordonnée "x" et "y" dans les tableaux "pointX" et "pointY"
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// A la fin, elle choisi la méthode d'affichage entre :
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// 1) une seule image SVG
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// 2) plusieurs images SVG
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function evaluerSVG(eq) {
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borneXGauche = parseFloat(document.getElementById("borneXGauche").value)
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borneXDroite = parseFloat(document.getElementById("borneXDroite").value)
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borneYGauche = parseFloat(document.getElementById("borneYGauche").value)
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borneYDroite = parseFloat(document.getElementById("borneYDroite").value)
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multiplicateurX = largeur/Math.abs(borneXDroite - borneXGauche)
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multiplicateurY = hauteur/Math.abs(borneYDroite - borneYGauche)
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lineWidth = document.getElementById("inputTaille").value
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var i = 0
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var y1, p1
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for(x=borneXGauche; x<=(borneXDroite+5*precision); x=x+precision){
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y = eval(eq)
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if(!isNaN(y)){
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i++
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pointX[i] = (x - borneXGauche) * multiplicateurX
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pointY[i] = hauteur - ((y - borneYGauche) * multiplicateurY)
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pente[i] = hauteur - (((y-y1)/precision - borneYGauche)* multiplicateurY)
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pente2[i] = hauteur - ((((y-y1)/precision-p1)/precision - borneYGauche)* multiplicateurY)
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p1 = (y-y1)/precision
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y1 = y
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}
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}
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pente[1]=pente[2]
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pente2[2]=pente2[3]
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pente2[1]=pente2[2]
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//alert(pointX+'\n'+pointY)
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if(document.getElementById("selectMethodeAffichage").value == "svg2"){
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calculerGraphSVG2(i)
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}
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else{
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calculerGraphSVG(i)
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}
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}
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// Même fonction mais pour dessiner à l'aide de canvas
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function evaluerCanvas(eq) {
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borneXGauche = parseFloat(document.getElementById("borneXGauche").value)
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borneXDroite = parseFloat(document.getElementById("borneXDroite").value)
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borneYGauche = parseFloat(document.getElementById("borneYGauche").value)
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borneYDroite = parseFloat(document.getElementById("borneYDroite").value)
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multiplicateurX = largeur/Math.abs(borneXDroite - borneXGauche)
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multiplicateurY = hauteur/Math.abs(borneYDroite - borneYGauche)
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lineWidth = document.getElementById("inputTaille").value
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var i = 0
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var y1, p1
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for(x=borneXGauche; x<=(borneXDroite+5*precision); x=x+precision){
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y = eval(eq)
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i++
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if(!isNaN(y)){
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pointX[i] = (x - borneXGauche) * multiplicateurX
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pointY[i] = hauteur - ((y - borneYGauche) * multiplicateurY)
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pente[i] = hauteur - (((y-y1)/precision - borneYGauche)* multiplicateurY)
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pente2[i] = hauteur - ((((y-y1)/precision-p1)/precision - borneYGauche)* multiplicateurY)
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p1 = (y-y1)/precision
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y1 = y
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}
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else{
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pointX[i] = "undefined"
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pointY[i] = "undefined"
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pente[i] = "undefined"
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pente2[i] = "undefined"
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}
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}
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pente[1]=pente[2]
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pente2[2]=pente2[3]
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pente2[1]=pente2[2]
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calculerGraphCanevas(i)
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}
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// ---- SVG (une image) ----
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// Génère le code HTML qui permet d'afficher le graphique et le place dans la div "affichage"
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function calculerGraphSVG2(fin){
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image = ""
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for (i=1; i<fin; i++){
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image = image + '<line x1="'+pointX[i]+'" y1="'+pointY[i]+'" x2="'+pointX[i+1]+'" y2="'+pointY[i+1]+'" style="stroke:'+couleurFonction+';stroke-width:2;"/>'
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}
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graphique = '<line x1="'+(-borneXGauche*multiplicateurX)+'" y1="'+0+'" x2="'+(-borneXGauche*multiplicateurX)+'" y2="'+hauteur+'" style="stroke:rgb(0,0,0);stroke-width:2;opacity:0.3;"/>'
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graphique = graphique + '<line x1="'+0+'" y1="'+(hauteur-(-borneYGauche*multiplicateurY))+'" x2="'+largeur+'" y2="'+(hauteur-(-borneYGauche*multiplicateurY))+'" style="stroke:rgb(0,0,0);stroke-width:2;opacity:0.3;"/>'
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image = '<svg width="100%" height="100%" version="1.1" xmlns="http://www.w3.org/2000/svg">'+image+graphique+'</svg> '
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document.getElementById("affichage").innerHTML = image
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//alert(image)
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}
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// ---- SVG (images multiples) ----
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// Créé les différents éléments pour dessiner la fonction mathématique
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// et les place dans la div "affichage"
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function calculerGraphSVG(fin){
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document.getElementById("affichage").innerHTML = ""
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svg = document.createElementNS("http://www.w3.org/2000/svg", "svg")
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svg.setAttribute("width", "100%")
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svg.setAttribute("height", "100%")
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for (i=1; i<fin; i++){
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if ((pointY[i]<0) && (pointY[i+1]>hauteur)){
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i++
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}
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if ((pointY[i]>hauteur) && (pointY[i+1]<0)){
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i++
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}
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var ligne = document.createElementNS("http://www.w3.org/2000/svg", "line")
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ligne.setAttribute("x1", pointX[i]+decalageX)
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ligne.setAttribute("x2", pointX[i+1]+decalageX)
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ligne.setAttribute("y1", pointY[i]+decalageY)
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ligne.setAttribute("y2", pointY[i+1]+decalageY)
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ligne.setAttribute("stroke", couleurFonction)
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ligne.setAttribute("stroke-width", lineWidth)
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svg.appendChild(ligne)
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}
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// dérivée
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if(document.getElementById("checkDerivee").checked){
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for (i=1; i<fin; i++){
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var ligne = document.createElementNS("http://www.w3.org/2000/svg", "line")
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ligne.setAttribute("x1", pointX[i]+decalageX)
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ligne.setAttribute("x2", pointX[i+1]+decalageX)
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ligne.setAttribute("y1", pente[i]+decalageY)
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ligne.setAttribute("y2", pente[i+1]+decalageY)
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ligne.setAttribute("stroke", "white")
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ligne.setAttribute("stroke-width", lineWidth)
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ligne.setAttribute("opacity", "0.8")
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svg.appendChild(ligne)
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}
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}
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if(document.getElementById("checkAxes").checked){
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calculerAxes()
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}
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calculerGrilleEchelle()
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document.getElementById("affichage").appendChild(svg)
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}
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// axes
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function calculerAxes(){
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var ligne = document.createElementNS("http://www.w3.org/2000/svg", "line")
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ligne.setAttribute("x1", (-borneXGauche*multiplicateurX)+decalageX)
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ligne.setAttribute("y1", 0+decalageY)
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ligne.setAttribute("x2", (-borneXGauche*multiplicateurX)+decalageX)
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ligne.setAttribute("y2", hauteur+decalageY)
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ligne.setAttribute("stroke", "rgb(0,0,0)")
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ligne.setAttribute("stroke-width", "2")
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ligne.setAttribute("opacity", "0.3")
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svg.appendChild(ligne)
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var ligne = document.createElementNS("http://www.w3.org/2000/svg", "line")
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ligne.setAttribute("x1", 0+decalageX)
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ligne.setAttribute("y1", (hauteur-(-borneYGauche*multiplicateurY))+decalageY)
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ligne.setAttribute("x2", largeur+decalageX)
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ligne.setAttribute("y2", (hauteur-(-borneYGauche*multiplicateurY))+decalageY)
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ligne.setAttribute("stroke", "rgb(0,0,0)")
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ligne.setAttribute("stroke-width", "2")
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ligne.setAttribute("opacity", "0.3")
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svg.appendChild(ligne)
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}
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// grille et échelle
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function calculerGrilleEchelle(){
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var intervalX = Math.round(Math.abs(borneXGauche-borneXDroite)/10)
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var intervalY = Math.round(Math.abs(borneYGauche-borneYDroite)/10)
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var initialX = Math.round(-borneXGauche) % intervalX
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var initialY = Math.round(-borneYGauche) % intervalY
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for(var i=initialX;i<=Math.round(borneXDroite-borneXGauche);i=i+intervalX){
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var position = Math.round((Math.round(borneXGauche) - borneXGauche +i) * multiplicateurX)
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if(document.getElementById("checkGrille").checked){
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var grille = document.createElementNS("http://www.w3.org/2000/svg", "line")
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grille.setAttribute("x1", position)
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grille.setAttribute("y1", 0)
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grille.setAttribute("x2", position)
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grille.setAttribute("y2", hauteur)
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grille.setAttribute("stroke", "rgb(0,0,0)")
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grille.setAttribute("stroke-width", "2")
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grille.setAttribute("opacity", "0.05")
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svg.appendChild(grille)
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}
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if(document.getElementById("checkEchelle").checked){
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var txt = document.createElementNS("http://www.w3.org/2000/svg", "text")
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txt.appendChild(document.createTextNode(i+borneXGauche))
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txt.setAttribute("x", position-6)
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txt.setAttribute("y", (hauteur-(-borneYGauche*multiplicateurY))+decalageY-2)
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txt.setAttribute("fill-opacity", 0.6)
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txt.setAttribute("fill", couleurEchelle)
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svg.appendChild(txt)
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}
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}
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for(var i=initialY;i<=Math.round(borneYDroite-borneYGauche);i=i+intervalY){
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var position = hauteur - Math.round((Math.round(borneYGauche) - borneYGauche +i) * multiplicateurY)
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if(document.getElementById("checkGrille").checked){
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var grille = document.createElementNS("http://www.w3.org/2000/svg", "line")
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grille.setAttribute("x1", 0)
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grille.setAttribute("y1", position)
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grille.setAttribute("x2", largeur)
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grille.setAttribute("y2", position)
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grille.setAttribute("stroke", "rgb(0,0,0)")
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grille.setAttribute("stroke-width", "2")
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grille.setAttribute("opacity", "0.05")
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svg.appendChild(grille)
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}
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if(document.getElementById("checkEchelle").checked){
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var txt = document.createElementNS("http://www.w3.org/2000/svg", "text")
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txt.appendChild(document.createTextNode(i+borneYGauche))
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txt.setAttribute("x", (-borneXGauche*multiplicateurX)+decalageX+2)
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txt.setAttribute("y", position+6)
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txt.setAttribute("fill-opacity", 0.6)
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txt.setAttribute("fill", couleurEchelle)
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svg.appendChild(txt)
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}
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}
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}
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// ---- Canevas ----
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// Permet de générer le code HTML nécessaire à canvas et dessine la fonction
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// à l'aide de lignes dans la zone de canvas.
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function calculerGraphCanevas(fin){
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document.getElementById("affichage").innerHTML = '<canvas id="canvas" width="'+largeur+'" height="'+hauteur+'"></canvas>'
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ctx = document.getElementById('canvas').getContext('2d')
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var undefined = true
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// Autres fonctions
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for(var i=0; i<listeFonctions.length; i++){
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ctx.beginPath()
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x = borneXGauche-3*precision
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y = eval(listeFonctions[i])
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if(isNaN(y)){
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ctx.moveTo(x, 0)
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}
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else{
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ctx.moveTo(x, y)
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}
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ctx.strokeStyle = listeCouleurs[i]
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ctx.fillStyle = listeCouleurs[i]
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ctx.lineWidth = lineWidth
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for(x=borneXGauche-2*precision; x<=(borneXDroite+2*precision); x+=precision){
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y = eval(listeFonctions[i])
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if(!isNaN(y)){
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ctx.lineTo((x - borneXGauche) * multiplicateurX+decalageX, hauteur - ((y - borneYGauche) * multiplicateurY)+decalageY)
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/*pente[i] = hauteur - ((10*(y-y1) - borneYGauche) * multiplicateurY)*/
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}
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}
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ctx.stroke()
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}
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// aire sous la fonctions
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if(document.getElementById("checkAire").checked){
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ctx.strokeStyle = "rgba(255,255,255,0)";
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ctx.fillStyle = "rgba(0,180,255,0.3)";
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var a = parseInt(document.getElementById("aireG").value);
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var b = parseInt(document.getElementById("aireD").value);
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var fct = document.getElementById("inputEq").value;
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var f = function(x){
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return eval(fct);
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};
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var convertX = function(nbr){
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return (nbr - borneXGauche) * multiplicateurX;
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};
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var convertY = function(nbr){
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return hauteur - ((nbr - borneYGauche) * multiplicateurY)
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};
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var n = 5000/(borneXDroite-borneXGauche);
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var aire, largeurRect, gaucheRect, droiteRect, millieuRect, hauteurRect, aireRect;
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aire = 0;
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largeurRect = (b-a)/n;
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for(var i=0; i<n; i++){
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gaucheRect = a + i*largeurRect;
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droiteRect = a + (i+1)*largeurRect;
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millieuRect = (gaucheRect+droiteRect) / 2;
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hauteurRect = f(millieuRect);
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//aireRect = largeurRect * hauteurRect;
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//aire = aire + aireRect;
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try{
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ctx.fillRect(convertX(gaucheRect), convertY(hauteurRect), 2, hauteurRect*multiplicateurY);
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}
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catch(err){
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}
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}
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}
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// fonction
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ctx.beginPath()
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//ctx.moveTo(pointX[1]+decalageX, pointY[1]+decalageY)
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ctx.strokeStyle = couleurFonction
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ctx.fillStyle = couleurFonction
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ctx.lineWidth = lineWidth
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if(document.getElementById("selectMethodeAffichage").value == "canvas"){
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for (i=1; i<fin; i++){
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if(isNaN(pointX[i]) || isNaN(pointY[i])){
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undefined = true
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}
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else{
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if(undefined){
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ctx.moveTo(pointX[i]+decalageX, pointY[i]+decalageY)
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}
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undefined = false
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ctx.lineTo(pointX[i]+decalageX, pointY[i]+decalageY)
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}
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}
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ctx.stroke()
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}
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else{
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for (i=1; i<fin; i++){
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if(!isNaN(pointX[i]) && !isNaN(pointY[i])){
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ctx.moveTo(pointX[i]+decalageX, pointY[i]+decalageY)
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ctx.arc(pointX[i]+decalageX, pointY[i]+decalageY, lineWidth/2, 0, 2*Math.PI, false)
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}
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}
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ctx.fill()
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//ctx.stroke()
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}
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// dérivée première
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if(document.getElementById("checkDerivee").checked){
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undefined = true
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ctx.beginPath()
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ctx.strokeStyle = "rgba(255, 255, 255, 0.8)"
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ctx.fillStyle = "rgba(255, 255, 255, 0.8)"
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ctx.lineWidth = lineWidth
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//ctx.moveTo(pointX[1]+decalageX, pente[1]+decalageY)
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for (i=1; i<fin; i++){
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if(isNaN(pointX[i]) || isNaN(pente[i])){
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undefined = true
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}
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else{
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if(undefined){
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try{
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ctx.moveTo(pointX[i]+decalageX, pente[i]+decalageY)
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}
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catch(err){
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//alert(";"+pente[i]+" ; "+pointX[i])
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}
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}
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undefined = false
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try{
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ctx.lineTo(pointX[i]+decalageX, pente[i]+decalageY)
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}
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catch(err){
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//alert(pente[i]+" ; "+pointX[i])
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}
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}
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}
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ctx.stroke()
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}
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// dérivée seconde
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if(document.getElementById("checkDerivee2").checked){
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undefined = true
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ctx.beginPath()
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ctx.strokeStyle = "rgba(150, 150, 150, 0.8)"
|
||
|
ctx.fillStyle = "rgba(150, 150, 150, 0.8)"
|
||
|
ctx.lineWidth = lineWidth
|
||
|
//ctx.moveTo(pointX[1]+decalageX, pente2[1]+decalageY)
|
||
|
for (i=1; i<fin-1; i++){
|
||
|
if(isNaN(pointX[i]) || isNaN(pente2[i])){
|
||
|
undefined = true
|
||
|
}
|
||
|
else{
|
||
|
if(undefined){
|
||
|
try{
|
||
|
ctx.moveTo(pointX[i+2]+decalageX, pente2[i+2]+decalageY)
|
||
|
}
|
||
|
catch(err){
|
||
|
|
||
|
}
|
||
|
}
|
||
|
undefined = false
|
||
|
try{
|
||
|
ctx.lineTo(pointX[i+2]+decalageX, pente2[i+2]+decalageY)
|
||
|
}
|
||
|
catch(err){
|
||
|
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
ctx.stroke()
|
||
|
}
|
||
|
|
||
|
// grille et échelle
|
||
|
var intervalX = Math.round(Math.abs(borneXGauche-borneXDroite)/10)
|
||
|
var intervalY = Math.round(Math.abs(borneYGauche-borneYDroite)/10)
|
||
|
var initialX = Math.round(-borneXGauche) % intervalX
|
||
|
var initialY = Math.round(-borneYGauche) % intervalY
|
||
|
ctx.beginPath()
|
||
|
ctx.fillStyle = couleurEchelle
|
||
|
ctx.lineWidth = "2"
|
||
|
for(var i=initialX;i<=Math.round(borneXDroite-borneXGauche);i=i+intervalX){
|
||
|
var position = Math.round((Math.round(borneXGauche) - borneXGauche +i) * multiplicateurX)
|
||
|
if(document.getElementById("checkGrille").checked){
|
||
|
ctx.moveTo(position, 0)
|
||
|
ctx.lineTo(position, hauteur)
|
||
|
}
|
||
|
|
||
|
if(document.getElementById("checkEchelle").checked){
|
||
|
ctx.fillText(Math.ceil(i+borneXGauche), position-6, (hauteur-(-borneYGauche*multiplicateurY))+decalageY-2)
|
||
|
}
|
||
|
}
|
||
|
for(var i=initialY;i<=Math.round(borneYDroite-borneYGauche);i=i+intervalY){
|
||
|
var position = hauteur - Math.round((Math.round(borneYGauche) - borneYGauche +i) * multiplicateurY)
|
||
|
if(document.getElementById("checkGrille").checked){
|
||
|
ctx.moveTo(0, position)
|
||
|
ctx.lineTo(largeur, position)
|
||
|
}
|
||
|
|
||
|
if(document.getElementById("checkEchelle").checked){
|
||
|
ctx.fillText(Math.ceil(i+borneYGauche), (-borneXGauche*multiplicateurX)+decalageX+2, position+6)
|
||
|
}
|
||
|
}
|
||
|
ctx.strokeStyle = couleurGrille
|
||
|
ctx.stroke()
|
||
|
|
||
|
// axes
|
||
|
if(document.getElementById("checkAxes").checked){
|
||
|
ctx.beginPath()
|
||
|
ctx.strokeStyle = couleurAxes
|
||
|
ctx.lineWidth = "2"
|
||
|
ctx.moveTo((-borneXGauche*multiplicateurX)+decalageX, 0+decalageY)
|
||
|
ctx.lineTo((-borneXGauche*multiplicateurX)+decalageX, hauteur+decalageY)
|
||
|
|
||
|
ctx.moveTo(0+decalageX, (hauteur-(-borneYGauche*multiplicateurY))+decalageY)
|
||
|
ctx.lineTo(largeur+decalageX, (hauteur-(-borneYGauche*multiplicateurY))+decalageY)
|
||
|
ctx.stroke()
|
||
|
}
|
||
|
}
|