problem description
touchmovetransform:scale23
related codes
//
function zoom(tInfo){
//
var ratio =
// touchmove
getHypotenuseLength(
tInfo.zoomCurrentTouches[0].clientX,
tInfo.zoomCurrentTouches[0].clientY,
tInfo.zoomCurrentTouches[1].clientX,
tInfo.zoomCurrentTouches[1].clientY) /
// touchstart
getHypotenuseLength(
tInfo.zoomStartTouches[0].clientX,
tInfo.zoomStartTouches[0].clientY,
tInfo.zoomStartTouches[1].clientX,
tInfo.zoomStartTouches[1].clientY)
//
this.currentItem.style.transform = "scale("+ ratio +")"
}
//
function getHypotenuseLength(x1, y1, x2, y2){
var sideW = x1 - x2
var sideH = y1 - y2
return Math.sqrt((sideW * sideW) + (sideH * sideH))
}
