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mouse.js
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mouse.js
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/* Compute mouse / touch coordinates on the canvas */
pointer_down = false;
update_mouse = e => {
pointer = {};
if(e.changedTouches){
pointer = e.changedTouches[0];
}
else {
pointer = e;
}
return [
~~(((pointer.pageX) - canvas_left) * canvas_width / canvas_real_width),
~~(((pointer.pageY) - canvas_top) * canvas_height / canvas_real_height)
];
}
/* Click */
onclick = e => {
e.preventDefault();
[click_x, click_y] = update_mouse(e);
};
/* Mousedown / touchstart */
onmousedown = ontouchstart = e => {
e.preventDefault();
pointer_down = true;
[down_x, down_y] = update_mouse(e);
};
/* Mousemove / touchmove */
onmousemove = ontouchmove = e => {
e.preventDefault();
[move_x, move_y] = update_mouse(e);
};
/* Mouseup / touchend */
onmouseup = ontouchend = e => {
e.preventDefault();
pointer_down = false;
[up_x, up_y] = update_mouse(e);
/* Add click on mobile */
if(e.changedTouches){
onclick();
}
};
/* Right click */
oncontextmenu = e => {
e.preventDefault();
};