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Bug fix: blurred canvas in Retina display (#68)

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This commit is contained in:
Hajime Hoshi 2015-01-07 23:59:04 +09:00
parent 27cd0610d1
commit 9915e6764a
1 changed files with 21 additions and 5 deletions
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26
internal/ui/ui_js.go
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@ -134,14 +134,30 @@ func init() {
})
}
func devicePixelRatio() int {
// TODO: What if ratio is not an integer but a float?
ratio := js.Global.Get("window").Get("devicePixelRatio").Int()
if ratio == 0 {
ratio = 1
}
return ratio
}
func Start(width, height, scale int, title string) (actualScale int, err error) {
doc := js.Global.Get("document")
doc.Set("title", title)
canvas.Set("width", width*scale)
canvas.Set("height", height*scale)
// for retina
actualScale = scale * devicePixelRatio()
canvas.Set("width", width*actualScale)
canvas.Set("height", height*actualScale)
canvasStyle := canvas.Get("style")
canvasStyle.Set("left", "calc(50% - "+strconv.Itoa(width*scale/2)+"px)")
canvasStyle.Set("top", "calc(50% - "+strconv.Itoa(height*scale/2)+"px)")
cssWidth := width * scale
cssHeight := height * scale
canvasStyle.Set("width", strconv.Itoa(cssWidth)+"px")
canvasStyle.Set("height", strconv.Itoa(cssHeight)+"px")
canvasStyle.Set("left", "calc(50% - "+strconv.Itoa(cssWidth/2)+"px)")
canvasStyle.Set("top", "calc(50% - "+strconv.Itoa(cssHeight/2)+"px)")
canvas.Set("onmousemove", func(e js.Object) {
rect := canvas.Call("getBoundingClientRect")
@ -152,5 +168,5 @@ func Start(width, height, scale int, title string) (actualScale int, err error)
})
canvas.Call("focus")
return scale, nil
return actualScale, nil
}