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* Changed the trigger distance between touches from 50 to 20. 

* The trigger distance now takes devicePixelRatio into account.
This commit is contained in:
samhed 2013-07-08 17:10:04 +02:00
parent a4ec2f5c7d
commit cf19ad3798
1 changed files with 9 additions and 4 deletions
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13
include/input.js
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@ -541,20 +541,25 @@ function onMouseButton(e, down) {
// Touch device // Touch device
// When two touches occur within 500 ms of each other and are // When two touches occur within 500 ms of each other and are
// closer than 50 pixels together a double click is triggered. // closer than 20 pixels together a double click is triggered.
if (down == 1) { if (down == 1) {
if (doubleClickTimer == null) { if (doubleClickTimer == null) {
lastTouchPos = pos; lastTouchPos = pos;
} else { } else {
clearTimeout(doubleClickTimer); clearTimeout(doubleClickTimer);
// When the distance between the two touches is less than
// 20 physical pixels force the position of the latter touch
// to the position of the first.
var xs = lastTouchPos.x - pos.x; var xs = lastTouchPos.x - pos.x;
var ys = lastTouchPos.y - pos.y; var ys = lastTouchPos.y - pos.y;
var d = Math.sqrt((xs * xs) + (ys * ys)); var d = Math.sqrt((xs * xs) + (ys * ys));
// When the distance between the two touches is less than 50 pixels // The devicePixelRatio is the ratio between logical pixels and
// force the position of the latter touch to the position of the first // physical pixels. A devicePixelRatio of 2 means that the
if (d < 50) { // physical linear resolution is double the logical resolution.
if (d < 20 * window.devicePixelRatio) {
pos = lastTouchPos; pos = lastTouchPos;
} }
} }