112 lines
2.2 KiB
Go
112 lines
2.2 KiB
Go
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package main
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import (
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"fmt"
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"image"
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"math"
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"math/rand"
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"os"
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"time"
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_ "image/png"
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"github.com/faiface/pixel"
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"github.com/faiface/pixel/pixelgl"
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"golang.org/x/image/colornames"
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)
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func loadPicture(path string) (pixel.Picture, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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img, _, err := image.Decode(file)
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if err != nil {
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return nil, err
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}
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return pixel.PictureDataFromImage(img), nil
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}
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func run() {
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cfg := pixelgl.WindowConfig{
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Title: "Pixel Rocks!",
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Bounds: pixel.R(0, 0, 1024, 768),
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}
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win, err := pixelgl.NewWindow(cfg)
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if err != nil {
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panic(err)
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}
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spritesheet, err := loadPicture("trees.png")
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if err != nil {
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panic(err)
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}
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batch := pixel.NewBatch(&pixel.TrianglesData{}, spritesheet)
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var treesFrames []pixel.Rect
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for x := spritesheet.Bounds().Min.X(); x < spritesheet.Bounds().Max.X(); x += 32 {
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for y := spritesheet.Bounds().Min.Y(); y < spritesheet.Bounds().Max.Y(); y += 32 {
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treesFrames = append(treesFrames, pixel.R(x, y, x+32, y+32))
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}
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}
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var (
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camPos = pixel.V(0, 0)
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camSpeed = 500.0
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camZoom = 1.0
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camZoomSpeed = 1.2
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)
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var (
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frames = 0
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second = time.Tick(time.Second)
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)
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last := time.Now()
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for !win.Closed() {
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dt := time.Since(last).Seconds()
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last = time.Now()
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cam := pixel.IM.Scaled(camPos, camZoom).Moved(win.Bounds().Center() - camPos)
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win.SetMatrix(cam)
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if win.Pressed(pixelgl.MouseButtonLeft) {
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tree := pixel.NewSprite(spritesheet, treesFrames[rand.Intn(len(treesFrames))])
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mouse := cam.Unproject(win.MousePosition())
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tree.SetMatrix(pixel.IM.Scaled(0, 4).Moved(mouse))
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tree.Draw(batch)
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}
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if win.Pressed(pixelgl.KeyLeft) {
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camPos -= pixel.X(camSpeed * dt)
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}
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if win.Pressed(pixelgl.KeyRight) {
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camPos += pixel.X(camSpeed * dt)
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}
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if win.Pressed(pixelgl.KeyDown) {
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camPos -= pixel.Y(camSpeed * dt)
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}
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if win.Pressed(pixelgl.KeyUp) {
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camPos += pixel.Y(camSpeed * dt)
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}
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camZoom *= math.Pow(camZoomSpeed, win.MouseScroll().Y())
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win.Clear(colornames.Forestgreen)
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batch.Draw(win)
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win.Update()
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frames++
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select {
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case <-second:
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win.SetTitle(fmt.Sprintf("%s | FPS: %d", cfg.Title, frames))
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frames = 0
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default:
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}
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}
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}
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func main() {
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pixelgl.Run(run)
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}
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