39 lines
936 B
Go
39 lines
936 B
Go
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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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"github.com/llgcode/draw2d/draw2dimg"
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"opslag.de/schobers/galleg/allegro5"
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)
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func drawBitmap(w, h int, draw func(*draw2dimg.GraphicContext)) *allegro5.Bitmap {
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dest := image.NewRGBA(image.Rect(0, 0, w, h))
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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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draw(gc)
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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 drawCircle(r, w int, startAngle, a float64, c color.Color) *allegro5.Bitmap {
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var width = 2*r + w
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return drawBitmap(width, width, func(gc *draw2dimg.GraphicContext) {
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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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})
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}
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