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Rotate sprite dynamically using delta time

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This commit is contained in:
mollusk 2018-01-16 20:27:09 -07:00
parent 736ffaa9da
commit 21406a1bfb
1 changed files with 15 additions and 2 deletions
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17
main.go
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@ -5,6 +5,7 @@ import (
"image" "image"
_ "image/png" _ "image/png"
"os" "os"
"time"
"github.com/faiface/pixel" "github.com/faiface/pixel"
"github.com/faiface/pixel/pixelgl" "github.com/faiface/pixel/pixelgl"
@ -37,6 +38,7 @@ func run() {
panic(err) panic(err)
} }
win.SetSmooth(true)
pic, err := loadPicture("hiking.png") pic, err := loadPicture("hiking.png")
if err != nil { if err != nil {
panic(err) panic(err)
@ -44,10 +46,21 @@ func run() {
sprite := pixel.NewSprite(pic, pic.Bounds()) sprite := pixel.NewSprite(pic, pic.Bounds())
win.Clear(colornames.Skyblue) angle := 0.0
sprite.Draw(win, pixel.IM.Moved(win.Bounds().Center())) last := time.Now()
for !win.Closed() { for !win.Closed() {
dt := time.Since(last).Seconds()
last = time.Now()
angle += 3 * dt
win.Clear(colornames.Firebrick)
mat := pixel.IM
mat = mat.Rotated(pixel.ZV, angle)
mat = mat.Moved(win.Bounds().Center())
sprite.Draw(win, mat)
win.Update() win.Update()
} }
} }