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input: Bug fix: Coordinate calculation of touch events

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This commit is contained in:
Hajime Hoshi 2016-05-27 01:47:24 +09:00
parent bdaff72af9
commit e84f798c7c
1 changed files with 4 additions and 3 deletions
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7
internal/ui/ui_js.go
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@ -115,13 +115,14 @@ func (u *userInterface) FinishRendering() error {
func touchEventToTouches(e *js.Object) []touch {
scale := currentUI.scale
j := e.Get("targetTouches")
rect := canvas.Call("getBoundingClientRect")
left, top := rect.Get("left").Int(), rect.Get("top").Int()
t := make([]touch, j.Get("length").Int())
for i := 0; i < len(t); i++ {
jj := j.Call("item", i)
target := jj.Get("target")
t[i].id = jj.Get("identifier").Int()
t[i].x = (jj.Get("clientX").Int() - target.Get("left").Int()) / scale
t[i].y = (jj.Get("clientY").Int() - target.Get("top").Int()) / scale
t[i].x = (jj.Get("clientX").Int() - left) / scale
t[i].y = (jj.Get("clientY").Int() - top) / scale
}
return t
}