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examples/blend: use the face's metrics to calculate the position

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For centering, using bounds is slightly inaccurate as the bounds
don't consider left/right-side bearings. Also, using bounds for
heights is slightly inaccurate as baselines for texts on the same
line would not be the same.

Updates #2143
This commit is contained in:
Hajime Hoshi 2023-06-02 01:58:02 +09:00
parent 0918877344
commit 41906115f4
1 changed files with 10 additions and 2 deletions
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12
examples/blend/main.go
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@ -22,7 +22,9 @@ import (
_ "image/png" _ "image/png"
"log" "log"
"golang.org/x/image/font"
"golang.org/x/image/font/inconsolata" "golang.org/x/image/font/inconsolata"
"golang.org/x/image/math/fixed"
"github.com/hajimehoshi/ebiten/v2" "github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images/blend" "github.com/hajimehoshi/ebiten/v2/examples/resources/images/blend"
@ -174,10 +176,16 @@ func maxSide(a, b *ebiten.Image) int {
) )
} }
func fixed26_6ToFloat64(x fixed.Int26_6) float64 {
return float64(x>>6) + float64(x&((1<<6)-1))/float64(1<<6)
}
// drawCenteredText is a util function for drawing blend mode description. // drawCenteredText is a util function for drawing blend mode description.
func drawCenteredText(screen *ebiten.Image, cx, cy float64, s string) { func drawCenteredText(screen *ebiten.Image, cx, cy float64, s string) {
bounds := text.BoundString(inconsolata.Bold8x16, s) advance := font.MeasureString(inconsolata.Bold8x16, s)
x, y := int(cx)-bounds.Min.X-bounds.Dx()/2, int(cy)-bounds.Min.Y-bounds.Dy()/2 m := inconsolata.Bold8x16.Metrics()
height := m.Ascent + m.Descent
x, y := int(cx-fixed26_6ToFloat64(advance)/2), int(cy-fixed26_6ToFloat64(height)/2+fixed26_6ToFloat64(m.Ascent))
text.Draw(screen, s, inconsolata.Bold8x16, x, y, color.Black) text.Draw(screen, s, inconsolata.Bold8x16, x, y, color.Black)
} }