mth/ebiten
1
0
Fork 0
mirror of https://github.com/hajimehoshi/ebiten.git synced 2025-01-26 02:42:02 +01:00
Code Issues Packages Projects Releases Wiki Activity

vector: Reduce segments

Browse Source
This commit is contained in:
Hajime Hoshi 2019-12-29 23:35:12 +09:00
parent 6d51ff4a12
commit faf8f6c58d
1 changed files with 11 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
vector/path.go
View File

@ -19,9 +19,10 @@ package vector
import ( import (
"image/color" "image/color"
"math"
"github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/vector/internal/math" vmath "github.com/hajimehoshi/ebiten/vector/internal/math"
) )
var emptyImage *ebiten.Image var emptyImage *ebiten.Image
@ -33,14 +34,14 @@ func init() {
// Path represents a collection of path segments. // Path represents a collection of path segments.
type Path struct { type Path struct {
segs [][]math.Point segs [][]vmath.Point
cur math.Point cur vmath.Point
} }
// MoveTo skips the current position of the path to the given position (x, y) without adding any strokes. // MoveTo skips the current position of the path to the given position (x, y) without adding any strokes.
func (p *Path) MoveTo(x, y float32) { func (p *Path) MoveTo(x, y float32) {
p.cur = math.Point{X: x, Y: y} p.cur = vmath.Point{X: x, Y: y}
p.segs = append(p.segs, []math.Point{p.cur}) p.segs = append(p.segs, []vmath.Point{p.cur})
} }
// LineTo adds a line segument to the path, which starts from the current position and ends to the given position (x, y). // LineTo adds a line segument to the path, which starts from the current position and ends to the given position (x, y).
@ -48,10 +49,10 @@ func (p *Path) MoveTo(x, y float32) {
// LineTo updates the current position to (x, y). // LineTo updates the current position to (x, y).
func (p *Path) LineTo(x, y float32) { func (p *Path) LineTo(x, y float32) {
if len(p.segs) == 0 { if len(p.segs) == 0 {
p.segs = append(p.segs, []math.Point{p.cur}) p.segs = append(p.segs, []vmath.Point{p.cur})
} }
p.segs[len(p.segs)-1] = append(p.segs[len(p.segs)-1], math.Point{X: x, Y: y}) p.segs[len(p.segs)-1] = append(p.segs[len(p.segs)-1], vmath.Point{X: x, Y: y})
p.cur = math.Point{X: x, Y: y} p.cur = vmath.Point{X: x, Y: y}
} }
func nseg(x0, y0, x1, y1 float32) int { func nseg(x0, y0, x1, y1 float32) int {
@ -68,11 +69,7 @@ func nseg(x0, y0, x1, y1 float32) int {
dist = disty dist = disty
} }
num := 1 return int(math.Ceil(float64(dist)))
for float32(num) < dist {
num *= 2
}
return num
} }
func (p *Path) QuadraticCurveTo(cpx, cpy, x, y float32) { func (p *Path) QuadraticCurveTo(cpx, cpy, x, y float32) {
@ -122,7 +119,7 @@ func (p *Path) Fill(dst *ebiten.Image, clr color.Color) {
ColorA: af, ColorA: af,
}) })
} }
for _, idx := range math.Triangulate(seg) { for _, idx := range vmath.Triangulate(seg) {
indices = append(indices, idx+base) indices = append(indices, idx+base)
} }
base += uint16(len(seg)) base += uint16(len(seg))