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Construction de la courbe d'une fonction
Considérons la fonction $h$ définie sur $\mathbb{R}$ par : $h:t\longmapsto t^2$, et son tableau de valeurs suivants :
| $t$ |
$-4$ |
$-3$ |
$-2$ |
$-1,5$ |
$-1$ |
$-0,5$ |
$0$ |
$0,5$ |
$1$ |
$1,5$ |
$2$ |
$3$ |
$4$ |
| $h(t)$ |
$16$ |
$9$ |
$4$ |
$2,25$ |
$1$ |
$0,25$ |
$0$ |
$0,25$ |
$1$ |
$2,25$ |
$4$ |
$9$ |
$16$ |
function affiche(){
couleur = noir
peinture = "#ffffff"
transparence = 1
rectangle([-20,20],40,40)
Xmin = -4.5
Xmax = 4.5
Ymin = -1
Ymax = 16.5
traceG()
traceX()
traceY()
segment([1,-0.2],[1,0.2])
segment([-0.1,1],[0.1,1])
texte("0",[-0.3,-0.7])
texte("1",[0.9,-0.8])
texte("1",[-0.4,0.8])
}
affiche()
n = 0
L = [-4,-3,-2,-1.5,-1,-0.5,0,0.5,1,1.5,2,3,4]
var btn = document.createElement("BUTTON");
btn.innerHTML = "Cliquer";
document.getElementById('addB').appendChild(btn);
btn.addEventListener ("click", function() {
function f(t){
return t*t;
}
if ( n == 14 ){
affiche()
n = 0
}
if( n == 13 ){
graphe(f,-4.5,4.5);
n++
document.getElementById("t12").style.backgroundColor = "rgba(255,0,0,0)";
document.getElementById("s12").style.backgroundColor = "rgba(255,0,0,0)";
}
if( n < 13){
couleur = rouge
ptc(L[n]);
colore(n)
n++
}
});
function ptc(x){
point([x,x*x]);
}
function colore(n){
for(var k = 0; k < 13; k++){
document.getElementById("t"+k).style.backgroundColor = "rgba(255,0,0,0)";
document.getElementById("s"+k).style.backgroundColor = "rgba(255,0,0,0)";
}
document.getElementById("t"+n).style.backgroundColor = "rgba(255,0,0,0.3)";
document.getElementById("s"+n).style.backgroundColor = "rgba(255,0,0,0.3)";
}