103 lines
2.1 KiB
Go
103 lines
2.1 KiB
Go
package main
|
|
|
|
import (
|
|
"image"
|
|
"math"
|
|
"math/rand"
|
|
"os"
|
|
"time"
|
|
|
|
_ "image/png"
|
|
|
|
"github.com/faiface/pixel"
|
|
"github.com/faiface/pixel/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)
|
|
}
|