/
main.go
151 lines (116 loc) · 2.84 KB
/
main.go
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package main
import (
"image"
"image/color"
"image/draw"
"log"
"math/rand"
"time"
"golang.org/x/mobile/app"
"golang.org/x/mobile/event/lifecycle"
"golang.org/x/mobile/event/paint"
"golang.org/x/mobile/event/size"
"golang.org/x/mobile/event/touch"
"golang.org/x/mobile/exp/gl/glutil"
"golang.org/x/mobile/geom"
"golang.org/x/mobile/gl"
)
const (
gridColumnsCount = 6
gridrowsCount = 8
tileSize = 60
)
type tile struct {
columnOffset geom.Pt
rowOffset geom.Pt
x geom.Pt
y geom.Pt
image *glutil.Image
color color.Color
}
func (t *tile) Draw(sz size.Event) {
draw.Draw(t.image.RGBA, t.image.RGBA.Bounds(), &image.Uniform{t.color}, image.Point{}, draw.Src)
t.image.Upload()
t.image.Draw(
sz,
geom.Point{t.columnOffset + t.x, t.rowOffset + t.y},
geom.Point{t.columnOffset + (t.x + tileSize), t.rowOffset + t.y},
geom.Point{t.columnOffset + t.x, t.rowOffset + (t.y + tileSize)},
t.image.RGBA.Bounds(),
)
}
type tiles [gridColumnsCount * gridrowsCount]tile
var (
images *glutil.Images
grid tiles
)
func onStart(glctx gl.Context, sz size.Event) {
images = glutil.NewImages(glctx)
colors := []color.RGBA{
{52, 152, 219, 1},
{231, 76, 60, 1},
{52, 73, 94, 1},
{46, 204, 113, 1},
}
for c := 0; c < gridColumnsCount; c++ {
for r := 0; r < gridrowsCount; r++ {
t := &grid[((c+1)*(r+1))-1]
t.image = images.NewImage(int(sz.PixelsPerPt*tileSize), int(sz.PixelsPerPt*tileSize))
t.color = colors[random(0, 4)]
}
}
}
func onStop(glctx gl.Context) {
images.Release()
}
func onPaint(glctx gl.Context, sz size.Event) {
glctx.ClearColor(236, 240, 241, 1)
glctx.Clear(gl.COLOR_BUFFER_BIT)
columnOffset := (sz.WidthPt / 2) - ((geom.Pt(gridColumnsCount) * tileSize) / 2)
rowOffset := (sz.HeightPt / 2) - ((geom.Pt(gridrowsCount) * tileSize) / 2)
for c := 0; c < gridColumnsCount; c++ {
for r := 0; r < gridrowsCount; r++ {
t := &grid[((c+1)*(r+1))-1]
t.columnOffset = columnOffset
t.rowOffset = rowOffset
t.x = geom.Pt(c) * tileSize
t.y = geom.Pt(r) * tileSize
t.Draw(sz)
}
}
}
func main() {
log.Println("starting the app")
app.Main(func(a app.App) {
var glctx gl.Context
visible, sz := false, size.Event{}
for e := range a.Events() {
switch e := a.Filter(e).(type) {
case lifecycle.Event:
switch e.Crosses(lifecycle.StageVisible) {
case lifecycle.CrossOn:
visible = true
glctx, _ = e.DrawContext.(gl.Context)
onStart(glctx, sz)
case lifecycle.CrossOff:
visible = false
onStop(glctx)
}
case size.Event:
sz = e
case touch.Event:
log.Println("touch event")
case paint.Event:
onPaint(glctx, sz)
a.Publish()
if visible {
a.Send(paint.Event{})
}
}
}
})
}
func random(min, max int) int {
rand.Seed(time.Now().UTC().UnixNano())
return rand.Intn(max-min) + min
}