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example: add gradients

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Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This commit is contained in:
Egon Elbre
2020-11-03 10:33:53 +02:00
committed by Elias Naur
parent f00f3a3359
commit 88b3c84ef6
2 changed files with 42 additions and 3 deletions
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example/tabs/tabs.go
+16 -3
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@@ -122,7 +122,7 @@ func drawTabs(gtx layout.Context, th *material.Theme) layout.Dimensions {
}),
layout.Flexed(1, func(gtx C) D {
return slider.Layout(gtx, func(gtx C) D {
fill(gtx, dynamicColor(tabs.selected))
fill(gtx, dynamicColor(tabs.selected), dynamicColor(tabs.selected+1))
return layout.Center.Layout(gtx,
material.H1(th, fmt.Sprintf("Tab content #%d", tabs.selected+1)).Layout,
)
@@ -139,9 +139,22 @@ func bounds(gtx layout.Context) f32.Rectangle {
}
}
func fill(gtx layout.Context, col color.RGBA) {
func fill(gtx layout.Context, col1, col2 color.RGBA) {
dr := bounds(gtx)
paint.ColorOp{Color: col}.Add(gtx.Ops)
paint.ColorOp{Color: color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xFF}}.Add(gtx.Ops)
paint.ColorOp{Color: color.RGBA{R: 0, G: 0, B: 0, A: 0xFF}}.Add(gtx.Ops)
paint.PaintOp{Rect: dr}.Add(gtx.Ops)
col2.R = byte(float32(col2.R))
col2.G = byte(float32(col2.G))
col2.B = byte(float32(col2.B))
col2.A = byte(float32(col2.A) * 0.2)
paint.LinearGradientOp{
Stop1: f32.Pt(dr.Min.X, 0),
Stop2: f32.Pt(dr.Max.X, 0),
Color1: col1,
Color2: col2,
}.Add(gtx.Ops)
paint.PaintOp{Rect: dr}.Add(gtx.Ops)
}