/
main.go
102 lines (87 loc) · 2.08 KB
/
main.go
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package main
import (
"image"
"math"
"math/rand"
"os"
"time"
_ "image/png"
"github.com/gopxl/pixel/v2"
"github.com/gopxl/pixel/v2/pixelgl"
"golang.org/x/image/colornames"
)
func loadPicture(path string) (pixel.Picture, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return nil, err
}
return pixel.PictureDataFromImage(img), nil
}
func run() {
cfg := pixelgl.WindowConfig{
Title: "Pixel Rocks!",
Bounds: pixel.R(0, 0, 1024, 768),
VSync: true,
}
win, err := pixelgl.NewWindow(cfg)
if err != nil {
panic(err)
}
spritesheet, err := loadPicture("trees.png")
if err != nil {
panic(err)
}
var treesFrames []pixel.Rect
for x := spritesheet.Bounds().Min.X; x < spritesheet.Bounds().Max.X; x += 32 {
for y := spritesheet.Bounds().Min.Y; y < spritesheet.Bounds().Max.Y; y += 32 {
treesFrames = append(treesFrames, pixel.R(x, y, x+32, y+32))
}
}
var (
camPos = pixel.ZV
camSpeed = 500.0
camZoom = 1.0
camZoomSpeed = 1.2
trees []*pixel.Sprite
matrices []pixel.Matrix
)
last := time.Now()
for !win.Closed() {
dt := time.Since(last).Seconds()
last = time.Now()
cam := pixel.IM.Scaled(camPos, camZoom).Moved(win.Bounds().Center().Sub(camPos))
win.SetMatrix(cam)
if win.JustPressed(pixelgl.MouseButtonLeft) {
tree := pixel.NewSprite(spritesheet, treesFrames[rand.Intn(len(treesFrames))])
trees = append(trees, tree)
mouse := cam.Unproject(win.MousePosition())
matrices = append(matrices, pixel.IM.Scaled(pixel.ZV, 4).Moved(mouse))
}
if win.Pressed(pixelgl.KeyLeft) {
camPos.X -= camSpeed * dt
}
if win.Pressed(pixelgl.KeyRight) {
camPos.X += camSpeed * dt
}
if win.Pressed(pixelgl.KeyDown) {
camPos.Y -= camSpeed * dt
}
if win.Pressed(pixelgl.KeyUp) {
camPos.Y += camSpeed * dt
}
camZoom *= math.Pow(camZoomSpeed, win.MouseScroll().Y)
win.Clear(colornames.Forestgreen)
for i, tree := range trees {
tree.Draw(win, matrices[i])
}
win.Update()
}
}
func main() {
pixelgl.Run(run)
}