92 lines
1.8 KiB
Go
92 lines
1.8 KiB
Go
// main
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package main
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import (
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"image"
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_ "image/png"
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"os"
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"time"
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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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//open file from the system
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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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//user 'defer' to close the file later on
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defer file.Close()
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//decode the file to find it's type
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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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//Pixel's main function (because GO forced them to do it this way)
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func run() {
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//set the Window parameters
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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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VSync: true,
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}
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//create a window and pass the parameters
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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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//smooth the edges of the image (antialiasing)
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win.SetSmooth(true)
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//load a specific image and catch any errors
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pic, err := loadPicture("hiking.png")
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if err != nil {
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panic(err)
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}
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//create a sprite using the loaded image
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sprite := pixel.NewSprite(pic, pic.Bounds())
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//set the angle of the image
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angle := 0.0
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//set the time to compare later
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last := time.Now()
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//loop until window is closed by "X" button
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for !win.Closed() {
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//compare the last time to delta time
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dt := time.Since(last).Seconds()
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last = time.Now()
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//set the angle according to delta time
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angle += 3 * dt
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//refresh screen and set background color
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win.Clear(colornames.Firebrick)
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//set the matrix and location of spirte in window
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mat := pixel.IM
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mat = mat.Rotated(pixel.ZV, angle)
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mat = mat.Moved(win.Bounds().Center())
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sprite.Draw(win, mat)
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//update the window
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win.Update()
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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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