98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
package ui
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import (
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"image"
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"image/color"
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"math"
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"time"
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"github.com/llgcode/draw2d/draw2dimg"
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"opslag.de/schobers/galleg/allegro5"
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)
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var _ Control = &Spinner{}
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type Spinner struct {
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ControlBase
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Text string
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spin float32
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circs []*allegro5.Bitmap
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}
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func createCirle(r, w int, startAngle, a float64, c color.Color) *allegro5.Bitmap {
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var width = 2*r + w
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dest := image.NewRGBA(image.Rect(0, 0, width, width))
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gc := draw2dimg.NewGraphicContext(dest)
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gc.SetFillColor(color.Transparent)
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gc.Clear()
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gc.SetFillColor(c)
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gc.SetStrokeColor(c)
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gc.SetLineWidth(float64(w))
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var rad = float64(r)
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var cnt = float64(width) * .5
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var dx1, dy1 = cnt + math.Cos(startAngle)*rad, cnt + math.Sin(startAngle)*rad
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gc.MoveTo(dx1, dy1)
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gc.ArcTo(cnt, cnt, rad, rad, startAngle, a)
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gc.Stroke()
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bmp, err := allegro5.NewBitmapFromImage(dest, false)
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if nil != err {
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return nil
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}
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return bmp
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}
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func (s *Spinner) Created(ctx Context, p Container) error {
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s.ControlBase.Created(ctx, p)
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const numCircs = 32
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s.circs = make([]*allegro5.Bitmap, numCircs)
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var am = math.Pi * 2 / float64(numCircs)
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for i := range s.circs {
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s.circs[i] = createCirle(8, 3, float64(i)*am, math.Pi, Blue500)
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}
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return nil
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}
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func (s *Spinner) Destroyed(ctx Context) {
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for _, circ := range s.circs {
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circ.Destroy()
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}
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}
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func (s *Spinner) Update(ctx Context, dt time.Duration) {
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var spin = float64(s.spin)
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spin += dt.Seconds()
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for spin > 1. {
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spin -= 1.
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}
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s.spin = float32(spin)
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}
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func (s *Spinner) Render(ctx Context) {
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var disp = ctx.Display()
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var fonts = ctx.Fonts()
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var width = float32(disp.Width())
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var height = float32(disp.Height())
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var fnt = fonts.Get("default")
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var textW = fnt.TextWidth(s.Text)
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allegro5.DrawFilledRectangle(0, 0, width, height, ctx.Palette().Disabled())
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const marginH, marginV float32 = 64, 16
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const textH float32 = 12
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var rectW, rectH float32 = textW + 2*marginH, 3*marginV + textH + 32
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var rectX, rectY = (width - rectW) * .5, (height - rectH) * .5
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allegro5.DrawFilledRectangle(rectX, rectY, rectX+rectW, rectY+rectH, ctx.Palette().White())
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DropShadow(rectX, rectY, rectX+rectW, rectY+rectH)
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fnt.Draw(rectX+marginH, rectY+marginV, ctx.Palette().Black(), allegro5.AlignLeft, s.Text)
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const numCircs = 32
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var i = int(math.Floor(float64(s.spin) * numCircs))
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s.circs[i].DrawOptions(width*.5, rectY+2*marginV+2*textH, allegro5.DrawOptions{Center: true})
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s.ControlBase.Render(ctx)
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}
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