Clean up drawing; add rotation with arrows

main.go

@@ -5,6 +5,7 @@ import (
 	"image"
 	_ "image/png"
 	"os"
+	"time"
 
 	"github.com/faiface/pixel"
 	"github.com/faiface/pixel/pixelgl"
@@ -57,12 +58,28 @@ func run() {
 
 	player := pixel.NewSprite(spritesheet, shipFrames[0])
 
+	angle := 0.0
+
+	last := time.Now()
 	for !win.Closed() {
-		//dt := time.Since(last).Seconds()
-		//last = time.Now()
+		dt := time.Since(last).Seconds()
+		last = time.Now()
+
 		win.Clear(colornames.Whitesmoke)
 
-		player.Draw(win, pixel.IM.Scaled(pixel.ZV, 0.25).Moved(win.Bounds().Center()))
+		mat := pixel.IM
+		mat = mat.Rotated(pixel.ZV, angle)
+		mat = mat.Scaled(pixel.ZV, 0.25).Moved(win.Bounds().Center())
+
+		player.Draw(win, mat)
+
+		if win.Pressed(pixelgl.KeyLeft) {
+			angle += 3 * dt
+		}
+		if win.Pressed(pixelgl.KeyRight) {
+			angle -= 3 * dt
+
+		}
 
 		win.Update()
 	}