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example/kitchen: include example of affine transforms

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Include an example of transforming the entire UI in the example.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>
This commit is contained in:
Viktor
2020-06-20 23:29:53 +02:00
committed by Elias Naur
parent cee045bf92
commit 1a9ae1af69
5 changed files with 42 additions and 8 deletions
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example/kitchen/kitchen.go
+36 -2
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@@ -18,6 +18,7 @@ import (
"gioui.org/app"
"gioui.org/app/headless"
"gioui.org/f32"
"gioui.org/font/gofont"
"gioui.org/io/router"
"gioui.org/io/system"
@@ -127,7 +128,15 @@ func loop(w *app.Window) error {
if *disable {
gtx = gtx.Disabled()
}
kitchen(gtx, th)
if checkbox.Changed() {
if checkbox.Value {
transformTime = e.Now
} else {
transformTime = time.Time{}
}
}
transformedKitchen(gtx, th)
e.Frame(gtx.Ops)
}
case p := <-progressIncrementer:
@@ -140,6 +149,30 @@ func loop(w *app.Window) error {
}
}
func transformedKitchen(gtx layout.Context, th *material.Theme) layout.Dimensions {
if !transformTime.IsZero() {
dt := float32(gtx.Now.Sub(transformTime).Seconds())
angle := dt * .1
op.InvalidateOp{}.Add(gtx.Ops)
defer op.Push(gtx.Ops).Pop()
tr := f32.Affine2D{}
tr = tr.Rotate(f32.Pt(300, 20), -angle)
scale := 1.0 - dt*.5
if scale < 0.5 {
scale = 0.5
}
tr = tr.Scale(f32.Pt(300, 20), f32.Pt(scale, scale))
offset := dt * 50
if offset > 200 {
offset = 200
}
tr = tr.Offset(f32.Pt(0, offset))
op.Affine(tr).Add(gtx.Ops)
}
return kitchen(gtx, th)
}
var (
editor = new(widget.Editor)
lineEditor = &widget.Editor{
@@ -163,6 +196,7 @@ var (
icon *widget.Icon
checkbox = new(widget.Bool)
swtch = new(widget.Bool)
transformTime time.Time
)
type (
@@ -268,7 +302,7 @@ func kitchen(gtx layout.Context, th *material.Theme) layout.Dimensions {
func(gtx C) D {
return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
layout.Rigid(
material.CheckBox(th, checkbox, "Checkbox").Layout,
material.CheckBox(th, checkbox, "Transform").Layout,
),
layout.Rigid(func(gtx C) D {
return layout.Inset{Left: unit.Dp(16)}.Layout(gtx,