made with requirebin
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November 8, 2017 00:38
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requirebin sketch
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| function swiper (root, onUp, onRight, onDown, onLeft) { | |
| const touches = []; | |
| root.addEventListener('touchstart', stash, false); | |
| root.addEventListener('touchmove', stash, false); | |
| root.addEventListener('touchcancel', function () { touches.length = 0; }, false); | |
| root.addEventListener('touchend', compute, false); | |
| // same order at dots below | |
| const cbs = [onUp, onRight, onDown, onLeft]; | |
| function compute (e) { | |
| e.preventDefault(); | |
| const vec = dir({ x: 0, y: 0 }, touches); | |
| const dots = [ | |
| // "up", -1 because +y in screen coords is downward | |
| dot(vec.x, vec.y, 0, -1), | |
| // right | |
| dot(vec.x, vec.y, 1, 0), | |
| // "down", 1 because -y in screen coords is upward | |
| dot(vec.x, vec.y, 0, 1), | |
| // left | |
| dot(vec.x, vec.y, -1, 0), | |
| ] | |
| const max = Math.max.apply(null, dots); | |
| const idx = dots.indexOf(max); | |
| document.body.innerHTML = '' | |
| + 'avg ' + JSON.stringify(vec) | |
| + '<br>' | |
| + 'dot {0,1} ' + dots[0] | |
| + '<br>' | |
| + 'dot {1,0} ' + dots[1] | |
| + '<br>' | |
| + 'dot {0,-1} ' + dots[2] | |
| + '<br>' | |
| + 'dot {-1,0} ' + dots[3]; | |
| cbs[idx](); | |
| touches.length = 0; | |
| } | |
| function dir (out, touches) { | |
| const originX = touches[0].x; | |
| const originY = touches[0].y; | |
| out.x = 0; | |
| out.y = 0; | |
| for (var i = 0; i < touches.length; i++) { | |
| out.x += touches[i].x - originX; | |
| out.y += touches[i].y - originY; | |
| } | |
| out.x = out.x / touches.length; | |
| out.y = out.y / touches.length; | |
| return out; | |
| } | |
| function stash (e) { | |
| e.preventDefault(); | |
| const changed = e.changedTouches; | |
| for (var i = 0; i < changed.length; i++) { | |
| const touch = changed[i]; | |
| touches.push({ | |
| x: touch.pageX, | |
| y: touch.pageY, | |
| }); | |
| } | |
| } | |
| function dot (x1, y1, x2, y2) { | |
| return x1 * x2 + y1 * y2; | |
| } | |
| } | |
| swiper(document, | |
| function () { document.body.innerHTML += '<br>up' }, | |
| function () { document.body.innerHTML += '<br>right' }, | |
| function () { document.body.innerHTML += '<br>down' }, | |
| function () { document.body.innerHTML += '<br>left' } | |
| ); |
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| setTimeout(function(){function swiper(root,onUp,onRight,onDown,onLeft){const touches=[];root.addEventListener("touchstart",stash,false);root.addEventListener("touchmove",stash,false);root.addEventListener("touchcancel",function(){touches.length=0},false);root.addEventListener("touchend",compute,false);const cbs=[onUp,onRight,onDown,onLeft];function compute(e){e.preventDefault();const vec=dir({x:0,y:0},touches);const dots=[dot(vec.x,vec.y,0,-1),dot(vec.x,vec.y,1,0),dot(vec.x,vec.y,0,1),dot(vec.x,vec.y,-1,0)];const max=Math.max.apply(null,dots);const idx=dots.indexOf(max);document.body.innerHTML=""+"avg "+JSON.stringify(vec)+"<br>"+"dot {0,1} "+dots[0]+"<br>"+"dot {1,0} "+dots[1]+"<br>"+"dot {0,-1} "+dots[2]+"<br>"+"dot {-1,0} "+dots[3];cbs[idx]();touches.length=0}function dir(out,touches){const originX=touches[0].x;const originY=touches[0].y;out.x=0;out.y=0;for(var i=0;i<touches.length;i++){out.x+=touches[i].x-originX;out.y+=touches[i].y-originY}out.x=out.x/touches.length;out.y=out.y/touches.length;return out}function stash(e){e.preventDefault();const changed=e.changedTouches;for(var i=0;i<changed.length;i++){const touch=changed[i];touches.push({x:touch.pageX,y:touch.pageY})}}function dot(x1,y1,x2,y2){return x1*x2+y1*y2}}swiper(document,function(){document.body.innerHTML+="<br>up"},function(){document.body.innerHTML+="<br>right"},function(){document.body.innerHTML+="<br>down"},function(){document.body.innerHTML+="<br>left"})},0); |
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| { | |
| "name": "requirebin-sketch", | |
| "description": "determine if touch swipes are generally up, right, down, left", | |
| "version": "1.0.0", | |
| "dependencies": {} | |
| } |
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| <!-- contents of this file will be placed inside the <body> --> |
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| <!-- contents of this file will be placed inside the <head> --> | |
| <style type="text/css"> | |
| body, html { height: 100%; width: 100%; overflow: hidden } | |
| </style> |
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