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onthedots/code/index.html

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<canvas id="canvas" style="border:1px solid #000"></canvas>
<button onclick="tourneG(tab,canvas,ctx)">Tourner G</button>
<button onclick="tourneD(tab,canvas,ctx)">Tourner D</button>
<canvas id="canvas2" style="border:1px solid #000"></canvas>
<button onclick="tourneG(tab2,canvas2,ctx2)">Tourner G2</button>
<button onclick="tourneD(tab2,canvas2,ctx2)">Tourner D2</button>
<canvas id="canvasTotal" style="border:1px solid #000"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var canvas2 = document.getElementById('canvas2');
var ctx2 = canvas2.getContext('2d');
var canvasT = document.getElementById('canvasTotal');
var ctxT = canvasT.getContext('2d');
tab=[];
tab2=[];
tabTotal=[];
width=300; // 6 lignes de 50px
height=300; // 6 colonnes de 50px
canvas.width=width;
canvas2.width=width;
canvasT.width=width;
canvas.height=height;
canvas2.height=height;
canvasT.height=height;
function faireCercle(x,y,color,lectx){
var cercle = new Path2D();
nx=50*(x>0 ? x+2 : x+3);
ny=50*(y>0 ? y+2 : y+3);
cercle.moveTo(nx, ny);
cercle.arc(nx+25, ny+25, 25, 0, 2 * Math.PI);
lectx.fillStyle = color;
lectx.fill(cercle);
//tab.push([x,y,color]);
}
function tourneG(letab,lecanvas,lectx)
{
letab.forEach(element => {
tmp=element[0];
element[0]=element[1];
element[1]=-tmp;
});
toutDessiner(letab,lecanvas,lectx);
//console.log("nv coords "+tab);
empiler();
}
function tourneD(letab,lecanvas,lectx)
{
letab.forEach(element => {
tmp=element[1];
element[1]=element[0];
element[0]=-tmp;
});
toutDessiner(letab,lecanvas,lectx);
//console.log("nv coords "+tab);
empiler();
}
function toutDessiner(pts,lecanvas,lectx)
{
//var lectx = lecanvas.getContext('2d');
lectx.clearRect(0, 0, lecanvas.width, lecanvas.height);
pts.forEach(element=> {
faireCercle(element[0],element[1],element[2],lectx);
})
}
function empiler()
{
tabTotal=[];
tab.forEach(element => {
tabTotal.push(element);
})
tab2.forEach(element => {
tabTotal.push(element);
})
toutDessiner(tabTotal,canvasT,ctxT);
}
tab.push([-3,-3,"green"],[-3,2,"red"],[1,2,"orange"]);
tab2.push([-2,-3,"green"],[-3,1,"blue"],[-1,2,"purple"]);
toutDessiner(tab,canvas,ctx);
toutDessiner(tab2,canvas2,ctx2);
//console.log("anc coords " + tab);
</script>