34 lines
874 B
Go
34 lines
874 B
Go
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package painter
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import (
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"fyne.io/fyne/v2"
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"fyne.io/fyne/v2/canvas"
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)
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// VectorPad returns the number of additional points that should be added around a texture.
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// This is to accommodate overflow caused by stroke and line endings etc.
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// THe result is in fyne.Size type coordinates and should be scaled for output.
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func VectorPad(obj fyne.CanvasObject) float32 {
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switch co := obj.(type) {
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case *canvas.Circle:
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if co.StrokeWidth > 0 && co.StrokeColor != nil {
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return co.StrokeWidth + 2
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}
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return 1 // anti-alias on circle fill
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case *canvas.Line:
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if co.StrokeWidth > 0 {
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return co.StrokeWidth + 2
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}
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case *canvas.Rectangle:
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if co.StrokeWidth > 0 && co.StrokeColor != nil {
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return co.StrokeWidth + 2
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}
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case *canvas.Text:
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if co.TextStyle.Italic {
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return co.TextSize / 5 // make sure that even a 20% lean does not overflow
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}
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}
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return 0
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}
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