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Add touch and pointer support #45

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be92dc7
add missing file
davidsickmiller Sep 8, 2018
64aa836
Add support for touch and pointer events to the demo
davidsickmiller Sep 8, 2018
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25 changes: 19 additions & 6 deletions demo.html
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Original file line number Diff line number Diff line change
Expand Up @@ -224,10 +224,17 @@ <h1>Ocrad.js&nbsp;<div style="font-size: small; font-weight: normal; display: in

// here's a really simple little drawing app so people can try their luck at
// the lottery that is offline handwriting recognition
var isTouchSupported = 'ontouchstart' in window;
var isPointerSupported = window.PointerEvent;
var isMSPointerSupported = window.MSPointerEvent;

var downEvent = isTouchSupported ? 'touchstart' : (isPointerSupported ? 'pointerdown' : (isMSPointerSupported ? 'MSPointerDown' : 'mousedown'));
var moveEvent = isTouchSupported ? 'touchmove' : (isPointerSupported ? 'pointermove' : (isMSPointerSupported ? 'MSPointerMove' : 'mousemove'));
var upEvent = isTouchSupported ? 'touchend' : (isPointerSupported ? 'pointerup' : (isMSPointerSupported ? 'MSPointerUp' : 'mouseup'));

var drag = false, lastX, lastY;
c.onmousedown = function(e){ drag = true; lastX = 0; lastY = 0; e.preventDefault(); c.onmousemove(e) }
c.onmouseup = function(e){ drag = false; e.preventDefault(); runOCR() }
c.onmousemove = function(e){

var draw = function(e){
e.preventDefault()
var rect = c.getBoundingClientRect();
var r = 5;
Expand All @@ -239,8 +246,8 @@ <h1>Ocrad.js&nbsp;<div style="font-size: small; font-weight: normal; display: in
o.fill()
}
if(drag){
var x = e.clientX - rect.left,
y = e.clientY - rect.top;
var x = isTouchSupported ? (e.targetTouches[0].pageX - c.offsetLeft) : (e.offsetX || e.layerX - c.offsetLeft);
var y = isTouchSupported ? (e.targetTouches[0].pageY - c.offsetTop) : (e.offsetY || e.layerY - c.offsetTop);

if(lastX && lastY){
var dx = x - lastX, dy = y - lastY;
Expand All @@ -254,7 +261,13 @@ <h1>Ocrad.js&nbsp;<div style="font-size: small; font-weight: normal; display: in
lastX = x;
lastY = y;
}
}
};
var startDraw = function(e){ drag = true; lastX = 0; lastY = 0; e.preventDefault(); draw(e) };
var endDraw = function(e){ drag = false; e.preventDefault(); runOCR() };

c.addEventListener(downEvent, startDraw, false);
c.addEventListener(moveEvent, draw, false);
c.addEventListener(upEvent, endDraw, false);


document.body.ondragover = function(){ document.body.className = 'dragging'; return false }
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4 changes: 4 additions & 0 deletions worker.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
importScripts('ocrad.js')
onmessage = function(e){
postMessage(OCRAD(e.data))
}