1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
package ui
import (
"image/color"
"math"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/vector"
)
var (
SPINNER_DEFAULT_FOREGROUND = color.White
SPINNER_DEFAULT_STROKE = 5
)
type Spinner struct {
WidgetBase
fg color.Color
alpha uint64
}
func NewSpinner(x, y int, diameter int) *Spinner {
s := &Spinner{
WidgetBase: NewWidgetBase(x, y, diameter, diameter),
fg: SPINNER_DEFAULT_FOREGROUND,
}
s.renderImpl = func() *ebiten.Image { return s.render() }
s.EventHandlersMap["update"] = func() error {
s.alpha = s.alpha + 3
s.ForceRedraw()
return nil
}
return s
}
func (s *Spinner) Fg(fg color.Color) *Spinner {
s.fg = fg
return s
}
func (s *Spinner) render() *ebiten.Image {
img := ebiten.NewImage(s.Width, s.Height)
var path vector.Path
r := float64((s.Width - 2*SPINNER_DEFAULT_STROKE) / 2)
cx := s.Width/2 + SPINNER_DEFAULT_STROKE
cy := cx
a1 := float64(s.alpha%360) * math.Pi / 180
a2 := float64((s.alpha+90)%360) * math.Pi / 180
path.Arc(float32(cx), float32(cy), float32(r), float32(a2), float32(a1), vector.Clockwise)
strokeOp := &vector.StrokeOptions{}
strokeOp.Width = float32(SPINNER_DEFAULT_STROKE)
drawOp := &vector.DrawPathOptions{}
drawOp.AntiAlias = true
vector.StrokePath(img, &path, strokeOp, drawOp)
return img
}
|
