joejulian/gio
1
0
Fork 1
mirror of https://git.sr.ht/~eliasnaur/gio synced 2026-07-06 18:05:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

f32: nicer Affine2D string formatting

Browse Source 
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This commit is contained in:
Egon Elbre
2022-10-11 11:49:00 +03:00
committed by Elias Naur
parent 80196f3c3e
commit dead6e007f
2 changed files with 45 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
f32/affine.go
+22 -2
View File
@@ -3,8 +3,8 @@
package f32
import (
"fmt"
"math"
"strconv"
)
// Affine2D represents an affine 2D transformation. The zero value of Affine2D
@@ -148,5 +148,25 @@ func (a Affine2D) shear(radiansX, radiansY float32) Affine2D {
func (a Affine2D) String() string {
sx, hx, ox, hy, sy, oy := a.Elems()
return fmt.Sprintf("[[%f %f %f] [%f %f %f]]", sx, hx, ox, hy, sy, oy)
// precision 6, one period, negative sign and space per number
const prec = 6
const charsPerFloat = prec + 2 + 1
s := make([]byte, 0, 6*charsPerFloat+6)
s = append(s, '[', '[')
s = strconv.AppendFloat(s, float64(sx), 'g', prec, 32)
s = append(s, ' ')
s = strconv.AppendFloat(s, float64(hx), 'g', prec, 32)
s = append(s, ' ')
s = strconv.AppendFloat(s, float64(ox), 'g', prec, 32)
s = append(s, ']', ' ', '[')
s = strconv.AppendFloat(s, float64(hy), 'g', prec, 32)
s = append(s, ' ')
s = strconv.AppendFloat(s, float64(sy), 'g', prec, 32)
s = append(s, ' ')
s = strconv.AppendFloat(s, float64(oy), 'g', prec, 32)
s = append(s, ']', ']')
return string(s)
}