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<!DOCTYPE html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
<style>
html,
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color:lightcyan;
}
#stage{
background-color:aliceblue;
position:absolute;
top:50%;
left:50%;
width:100%;
height:auto;
transform:translate(-50%, -50%);
}
#touch{
touch-action: none;
}
</style>
<script src="snap.svg-min.js"></script>
</head>
<body>
<SVG id='stage'></SVG>
<script>
let wn=window.innerWidth, hn=window.innerHeight;
const w=950, h= 345;
svg=document.getElementById('stage');
paper=Snap("#stage");
paper.attr({
viewBox:[0,0,w,h].join(',')
});
function getPointerSVG(svg, event) {
const svgMatrix = svg.getScreenCTM();
return {
x: (event.clientX - svgMatrix.e) / svgMatrix.a,
y: (event.clientY - svgMatrix.f) / svgMatrix.d
};
}
const pi=Math.PI;
const deg= 180/pi;
const rad=1/deg;
const R= h/2;
const xD=w-2*R-R/20;
const ctx=xD+R/1.5;
let theta_start, theta_move, theta;
let theta_old=0;
class Disque{
constructor(posX, posY, ray,colstroke,colfill){
this.innerHTML=paper.circle(posX, posY, ray).attr({
strokeWidth: 1,
stroke: colstroke,
fill:colfill
});
}
}
class Grads{
constructor(posX,posY,taille,alpha){
this.innerHTML=paper.line(posX, posY, posX+taille, posY).attr({
stroke: "black",
strokeWidth: 1
}).transform("r" + alpha + " ," + (ctx) + "," + R);
}
}
class Textgrad{
constructor(x,y,text){
this.innerHTML=paper.text( x, y, text).attr({
"font-family":"Tahoma",
"font-size":R/22,
"font-weight": "bold",
fill:'#555555'
});
}
}
const fond=paper.rect(0,0,w,h).attr({
stroke:'#443F46',
strokeWidth:1,
fill: "#f0e5cb"}
);
const grads=paper.g();
for (let i=0;i<360;i++) grads.add(new Grads(ctx+R-.03*R,R,.03*R,i).innerHTML);
const grads10=paper.g();
const textg=paper.g();
const grads5=paper.g();
for (let j=0;j<36;j++){
grads10.add( new Grads(ctx+R-0.09*R,R,0.09*R,10*j).innerHTML );
if (j<=9) {angle=String(10*j);}
else if ( (j>9) && (j<=18) ) {angle=String(90-(j-9)*10);}
else if ( (j>18) && (j<=27) ) {angle=String((j-9)*10-90);}
else {angle=String(170- (j-19)*10);}
textg.add( new Textgrad(ctx-R+R*(0.97+7/8*Math.cos(10*j*rad) ) ,R*(1.015+7/8*Math.sin(10*j*rad) ) ,angle).innerHTML );
}
for (let k=0; k<72; k++){
grads5.add( new Grads(ctx+R-0.06*R,R,0.06*R,5*k).innerHTML );
}
const rapporteur=paper.g(
new Disque(xD+R/1.5,R,R,'#fffaf0','#fffaf0').innerHTML,
new Disque(xD+R/1.5,R,R/70,'black','#fffaf0').innerHTML,
paper.g(paper.circle(xD+R/1.5,R,R/1.5),paper.circle(ctx,R,R/4),paper.circle(ctx,R,R/10),paper.line(ctx-R,R,ctx+R,R),
paper.line(ctx,0,ctx,2*R) ).attr({
stroke: "black",
strokeWidth: 1,
fill:'none'
}),grads,grads5,grads10,textg
);
rapporteur.node.id='touch';
let b=rapporteur.getBBox();
function handlePointerMove(e){
e.preventDefault();
let p=getPointerSVG(svg,e);
theta_move = Math.atan2(R-p.y,p.x-R-b.x);
theta = (theta_move-theta_start+theta_old)%(2*pi);
rapporteur.transform("r" + ( -deg*theta) + " ," + (R+b.x) + "," + R);
}
function handlePointerUp(e){
e.preventDefault();
rapporteur.attr({"cursor" : "grab"});
theta_old=theta;
rapporteur.node.removeEventListener('pointermove',handlePointerMove);
window.removeEventListener('pointerup',handlePointerUp);
}
function handlePointerDown(e){
e.preventDefault();
let p=getPointerSVG(svg,e);
rapporteur.attr({"cursor" : "grabbing"});
theta_start=Math.atan2(R-p.y,p.x-R-b.x);
rapporteur.node.addEventListener('pointermove',handlePointerMove);
window.addEventListener('pointerup',handlePointerUp);
}
rapporteur.node.addEventListener('pointerdown',handlePointerDown);
</script>
</body>
</html> |
[Snap.svg] touch-action none
Répondre avec citation
En fait, je pensais faire une rotation globale de 90° pour imposer le mode landscape car je suis en mode portrait sur smartphone par défaut... à l'aide de Screen Orientation API... mais si ça chamboule le comportement de mes callback pour les événements pointer par rotation, je n'ai pas envie de trop me casser la tête...
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