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ebitenutil: use vector's functions again but with anti-alias false

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This is basically a revert for bf63d2310d.

As anti-alias options are added to the vector package's functions, we
should be able to emulate the same thing without performance penalty.

Updates #2605
Updates #2606
This commit is contained in:
Hajime Hoshi 2023-03-18 11:06:19 +09:00
parent 8bd7ce5c20
commit 34b8c5483a
1 changed files with 7 additions and 57 deletions
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64
ebitenutil/shapes.go
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@ -15,85 +15,35 @@
package ebitenutil
import (
"image"
"image/color"
"math"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/vector"
)
var (
whiteImage = ebiten.NewImage(3, 3)
whiteSubImage = whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
)
func init() {
pix := make([]byte, 4*3*3)
for i := range pix {
pix[i] = 0xff
}
whiteImage.WritePixels(pix)
}
// DrawLine draws a line segment on the given destination dst.
//
// DrawLine is intended to be used mainly for debugging or prototyping purpose.
//
// Use vector.StrokeLine instead if you require rendering with higher quality.
// Deprecated: as of v2.5. Use vector.StrokeLine without anti-aliasing instead.
func DrawLine(dst *ebiten.Image, x1, y1, x2, y2 float64, clr color.Color) {
// Use ebiten.Image's DrawImage instead of vector.StrokeLine for backward compatibility (#2605)
length := math.Hypot(x2-x1, y2-y1)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(length, 1)
op.GeoM.Rotate(math.Atan2(y2-y1, x2-x1))
op.GeoM.Translate(x1, y1)
op.ColorScale.ScaleWithColor(clr)
// Filter must be 'nearest' filter (default).
// Linear filtering would make edges blurred.
dst.DrawImage(whiteSubImage, op)
vector.StrokeLine(dst, float32(x1), float32(y1), float32(x2), float32(y2), 1, clr, false)
}
// DrawRect draws a rectangle on the given destination dst.
//
// DrawRect is intended to be used mainly for debugging or prototyping purpose.
//
// Use vector.DrawFilledRect instead if you require rendering with higher quality.
// Deprecated: as of v2.5. Use vector.DrawFilledRect without anti-aliasing instead.
func DrawRect(dst *ebiten.Image, x, y, width, height float64, clr color.Color) {
// Use ebiten.Image's DrawImage instead of vector.DrawFilledRect for backward compatibility (#2605)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(width, height)
op.GeoM.Translate(x, y)
op.ColorScale.ScaleWithColor(clr)
// Filter must be 'nearest' filter (default).
// Linear filtering would make edges blurred.
dst.DrawImage(whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image), op)
vector.DrawFilledRect(dst, float32(x), float32(y), float32(width), float32(height), clr, false)
}
// DrawCircle draws a circle on given destination dst.
//
// DrawCircle is intended to be used mainly for debugging or prototyping puropose.
// DrawCircle is intended to be used mainly for debugging or prototyping purpose.
//
// Use vector.DrawFilledCircle instead if you require rendering with higher quality.
// Deprecated: as of v2.5. Use vector.DrawFilledCircle without anti-aliasing instead.
func DrawCircle(dst *ebiten.Image, cx, cy, r float64, clr color.Color) {
// Use ebiten.Image's DrawTriangles instead of vector.DrawFilledCircle for backward compatibility (#2605)
var path vector.Path
rd, g, b, a := clr.RGBA()
path.Arc(float32(cx), float32(cy), float32(r), 0, 2*math.Pi, vector.Clockwise)
vertices, indices := path.AppendVerticesAndIndicesForFilling(nil, nil)
for i := range vertices {
vertices[i].SrcX = 1
vertices[i].SrcY = 1
vertices[i].ColorR = float32(rd) / 0xffff
vertices[i].ColorG = float32(g) / 0xffff
vertices[i].ColorB = float32(b) / 0xffff
vertices[i].ColorA = float32(a) / 0xffff
}
dst.DrawTriangles(vertices, indices, whiteSubImage, nil)
vector.DrawFilledCircle(dst, float32(cx), float32(cy), float32(r), clr, false)
}