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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build example
// +build example
//
// This build tag means that "go install golang.org/x/exp/shiny/..." doesn't
// install this example program. Use "go run main.go" to run it or "go install
// -tags=example" to install it.
// Basic is a basic example of a graphical application.
package main
import (
"fmt"
"image"
"image/color"
"log"
"math"
"golang.org/x/exp/shiny/driver"
"golang.org/x/exp/shiny/imageutil"
"golang.org/x/exp/shiny/screen"
"golang.org/x/image/math/f64"
"golang.org/x/mobile/event/key"
"golang.org/x/mobile/event/lifecycle"
"golang.org/x/mobile/event/paint"
"golang.org/x/mobile/event/size"
)
var (
blue0 = color.RGBA{0x00, 0x00, 0x1f, 0xff}
blue1 = color.RGBA{0x00, 0x00, 0x3f, 0xff}
darkGray = color.RGBA{0x3f, 0x3f, 0x3f, 0xff}
green = color.RGBA{0x00, 0x7f, 0x00, 0x7f}
red = color.RGBA{0x7f, 0x00, 0x00, 0x7f}
yellow = color.RGBA{0x3f, 0x3f, 0x00, 0x3f}
cos30 = math.Cos(math.Pi / 6)
sin30 = math.Sin(math.Pi / 6)
)
func main() {
driver.Main(func(s screen.Screen) {
w, err := s.NewWindow(&screen.NewWindowOptions{
Title: "Basic Shiny Example",
})
if err != nil {
log.Fatal(err)
}
defer w.Release()
size0 := image.Point{256, 256}
b, err := s.NewBuffer(size0)
if err != nil {
log.Fatal(err)
}
defer b.Release()
drawGradient(b.RGBA())
t0, err := s.NewTexture(size0)
if err != nil {
log.Fatal(err)
}
defer t0.Release()
t0.Upload(image.Point{}, b, b.Bounds())
size1 := image.Point{32, 20}
t1, err := s.NewTexture(size1)
if err != nil {
log.Fatal(err)
}
defer t1.Release()
t1.Fill(t1.Bounds(), green, screen.Src)
t1.Fill(t1.Bounds().Inset(2), red, screen.Over)
t1.Fill(t1.Bounds().Inset(4), red, screen.Src)
var sz size.Event
for {
e := w.NextEvent()
// This print message is to help programmers learn what events this
// example program generates. A real program shouldn't print such
// messages; they're not important to end users.
format := "got %#v\n"
if _, ok := e.(fmt.Stringer); ok {
format = "got %v\n"
}
fmt.Printf(format, e)
switch e := e.(type) {
case lifecycle.Event:
if e.To == lifecycle.StageDead {
return
}
case key.Event:
if e.Code == key.CodeEscape {
return
}
case paint.Event:
const inset = 10
for _, r := range imageutil.Border(sz.Bounds(), inset) {
w.Fill(r, blue0, screen.Src)
}
w.Fill(sz.Bounds().Inset(inset), blue1, screen.Src)
w.Upload(image.Point{20, 0}, b, b.Bounds())
w.Fill(image.Rect(50, 50, 350, 120), red, screen.Over)
// By default, draw the entirety of the texture using the Over
// operator. Uncomment one or both of the lines below to see
// their different effects.
op := screen.Over
// op = screen.Src
t0Rect := t0.Bounds()
// t0Rect = image.Rect(16, 0, 240, 100)
// Draw the texture t0 twice, as a 1:1 copy and under the
// transform src2dst.
w.Copy(image.Point{150, 100}, t0, t0Rect, op, nil)
src2dst := f64.Aff3{
+0.5 * cos30, -1.0 * sin30, 100,
+0.5 * sin30, +1.0 * cos30, 200,
}
w.Draw(src2dst, t0, t0Rect, op, nil)
w.DrawUniform(src2dst, yellow, t0Rect.Inset(30), screen.Over, nil)
// Draw crosses at the transformed corners of t0Rect.
for _, sx := range []int{t0Rect.Min.X, t0Rect.Max.X} {
for _, sy := range []int{t0Rect.Min.Y, t0Rect.Max.Y} {
dx := int(src2dst[0]*float64(sx) + src2dst[1]*float64(sy) + src2dst[2])
dy := int(src2dst[3]*float64(sx) + src2dst[4]*float64(sy) + src2dst[5])
w.Fill(image.Rect(dx-0, dy-1, dx+1, dy+2), darkGray, screen.Src)
w.Fill(image.Rect(dx-1, dy-0, dx+2, dy+1), darkGray, screen.Src)
}
}
// Draw t1.
w.Copy(image.Point{400, 50}, t1, t1.Bounds(), screen.Src, nil)
w.Publish()
case size.Event:
sz = e
case error:
log.Print(e)
}
}
})
}
func drawGradient(m *image.RGBA) {
b := m.Bounds()
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
if x%64 == 0 || y%64 == 0 {
m.SetRGBA(x, y, color.RGBA{0xff, 0xff, 0xff, 0xff})
} else if x%64 == 63 || y%64 == 63 {
m.SetRGBA(x, y, color.RGBA{0x00, 0x00, 0xff, 0xff})
} else {
m.SetRGBA(x, y, color.RGBA{uint8(x), uint8(y), 0x00, 0xff})
}
}
}
// Round off the corners.
const radius = 64
lox := b.Min.X + radius - 1
loy := b.Min.Y + radius - 1
hix := b.Max.X - radius
hiy := b.Max.Y - radius
for y := 0; y < radius; y++ {
for x := 0; x < radius; x++ {
if x*x+y*y <= radius*radius {
continue
}
m.SetRGBA(lox-x, loy-y, color.RGBA{})
m.SetRGBA(hix+x, loy-y, color.RGBA{})
m.SetRGBA(lox-x, hiy+y, color.RGBA{})
m.SetRGBA(hix+x, hiy+y, color.RGBA{})
}
}
}
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