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60 lines
2.4 KiB
60 lines
2.4 KiB
13 years ago
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// -------------------- sankore --------------------
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// Ces fonctions permettent de dessiner le graphique directement dans sankore.
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// Calcule tous les points de la fonction mathématique et les place dans des tableaux.
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function evaluerUniboard(eq) {
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largeur += 100
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hauteur += 100
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decalageX -= 250
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decalageY -= 200
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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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BoucleFor: for(x=borneXGauche; x<=(borneXDroite+0); x=x+precision){
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i++
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y = eval(eq)
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pointX[i] = Math.round((x - borneXGauche) * multiplicateurX)
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pointY[i] = hauteur - Math.round((y - borneYGauche) * multiplicateurY)
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}
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calculerGraphUniboard(i)
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}
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// Regarde chaque coordonnées stockées dans le tableau et dessine le graphique
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function calculerGraphUniboard(fin){
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document.getElementById("affichage").innerHTML = ""
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sankore.setTool('pen')
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sankore.moveTo(pointX[2]+decalageX, pointY[2]+decalageY)
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for (i=3; i<fin; i++){
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if ((pointY[i]<0) || (pointY[i]>hauteur)){
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sankore.moveTo(pointX[i+1]+decalageX,pointY[i+1]+decalageY)
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continue
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}
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sankore.drawLineTo(pointX[i]+decalageX, pointY[i]+decalageY, lineWidth)
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}
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//dessiner le cadre
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sankore.moveTo(0+decalageX,0+decalageY)
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sankore.drawLineTo(largeur+decalageX, 0+decalageY, lineWidth)
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sankore.drawLineTo(largeur+decalageX, hauteur+decalageY, lineWidth)
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sankore.drawLineTo(0+decalageX, hauteur+decalageY, lineWidth)
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sankore.drawLineTo(0+decalageX, 0+decalageY, lineWidth)
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//dessiner les axes
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sankore.moveTo((-borneXGauche*multiplicateurX)+decalageX, 0+decalageY)
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sankore.drawLineTo((-borneXGauche*multiplicateurX)+decalageX, hauteur+decalageY, lineWidth)
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sankore.moveTo(0+decalageX, (hauteur-(-borneYGauche*multiplicateurY))+decalageY)
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sankore.drawLineTo(largeur+decalageX, (hauteur-(-borneYGauche*multiplicateurY))+decalageY, lineWidth)
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decalageX += 250
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decalageY += 200
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largeur -= 100
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hauteur -= 100
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sankore.setTool('arrow')
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}
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