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Centering <canvas>

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This commit is contained in:
Hajime Hoshi 2015-01-05 22:22:47 +09:00
parent 1a4b25b23f
commit 3f45685136
1 changed files with 16 additions and 1 deletions
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17
internal/ui/ui_js.go
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@ -20,6 +20,7 @@ import (
"github.com/gopherjs/gopherjs/js"
"github.com/gopherjs/webgl"
"github.com/hajimehoshi/ebiten/internal/opengl"
"strconv"
"time"
)
@ -58,7 +59,18 @@ func init() {
canvas.Set("width", 16)
canvas.Set("height", 16)
doc.Get("body").Call("appendChild", canvas)
doc.Get("body").Get("style").Set("backgroundColor", "#000")
htmlStyle := doc.Get("documentElement").Get("style")
htmlStyle.Set("height", "100%")
bodyStyle := doc.Get("body").Get("style")
bodyStyle.Set("backgroundColor", "#000")
bodyStyle.Set("position", "relative")
bodyStyle.Set("height", "100%")
canvasStyle := canvas.Get("style")
canvasStyle.Set("position", "absolute")
webglContext, err := webgl.NewContext(canvas, &webgl.ContextAttributes{
Alpha: true,
PremultipliedAlpha: true,
@ -89,5 +101,8 @@ func Start(width, height, scale int, title string) (actualScale int, err error)
doc.Set("title", title)
canvas.Set("width", width*scale)
canvas.Set("height", height*scale)
canvasStyle := canvas.Get("style")
canvasStyle.Set("top", "calc(50% - "+strconv.Itoa(width*scale/2)+"px)")
canvasStyle.Set("left", "calc(50% - "+strconv.Itoa(height*scale/2)+"px)")
return scale, nil
}