Add angles to Player struct; Move drag and speed change to own functions

main.go

@@ -22,10 +22,43 @@ type Player struct {
 	xV,
 	yV,
 	angularVelocity,
-	acceleration float64
+	acceleration,
+	angleRad,
+	angleDeg float64
 	vec pixel.Vec
 }
 
+func playerDrag(player *Player) {
+	if player.yV > 0 {
+		player.yV -= player.drag
+		if player.yV < 0 {
+			player.yV = 0
+		}
+	}
+
+	if player.yV < 0 {
+		player.yV += player.drag
+		if player.yV > 0 {
+			player.yV = 0
+		}
+	}
+
+	if player.xV > 0 {
+		player.xV -= player.drag
+		if player.xV < 0 {
+			player.xV = 0
+		}
+	}
+
+	if player.xV < 0 {
+		player.xV += player.drag
+		if player.xV > 0 {
+			player.xV = 0
+		}
+	}
+	//return player
+}
+
 func loadSprite(path string) (pixel.Picture, error) {
 	file, err := os.Open(path)
 	if err != nil {
@@ -39,7 +72,14 @@ func loadSprite(path string) (pixel.Picture, error) {
 	return pixel.PictureDataFromImage(img), nil
 }
 
-func createSpriteSheet(SpriteSheetImg pixel.Picture, spriteSizeX, spriteSizeY float64) []pixel.Rect {
+func playerAdjustSpeed(player *Player, dt float64) {
+	player.x += player.xV * dt
+	player.y += player.yV * dt
+}
+
+func createSpriteSheet(SpriteSheetImg pixel.Picture,
+	spriteSizeX, spriteSizeY float64) []pixel.Rect {
+
 	var frames []pixel.Rect
 
 	for x := SpriteSheetImg.Bounds().Min.X; x < SpriteSheetImg.Bounds().Max.X; x += spriteSizeX {
@@ -82,8 +122,9 @@ func run() {
 	player.yV = 0
 	player.vec.X = player.x
 	player.vec.Y = player.y
-	var angle float64 = 0.0
-	var angleInDegrees float64 = 0
+	player.angularVelocity = 3
+	player.angleRad = 0.0
+	player.angleDeg = 0
 
 	var (
 		frames = 0
@@ -94,13 +135,12 @@ func run() {
 	for !win.Closed() {
 		dt := time.Since(last).Seconds()
 		last = time.Now()
-
 		win.Clear(colornames.Whitesmoke)
 
 		player.vec = pixel.Vec{player.x, player.y}
 
 		mat := pixel.IM
-		mat = mat.Rotated(pixel.ZV, angle)
+		mat = mat.Rotated(pixel.ZV, player.angleRad)
 		mat = mat.Scaled(pixel.ZV, 0.25)
 		mat = mat.Moved(player.vec)
 
@@ -108,10 +148,10 @@ func run() {
 
 		if win.Pressed(pixelgl.KeyLeft) {
 
-			angle += 3 * dt
+			player.angleRad += player.angularVelocity * dt
 		}
 		if win.Pressed(pixelgl.KeyRight) {
-			angle -= 3 * dt
+			player.angleRad -= player.angularVelocity * dt
 
 		}
 
@@ -119,12 +159,24 @@ func run() {
 			win.SetClosed(true)
 		}
 
+		if win.JustReleased(pixelgl.KeyF12) {
+			fmt.Printf("Player.x: %f \n", player.x)
+			fmt.Printf("Player.y: %f \n", player.y)
+			fmt.Printf("Max Speed: %f \n", player.maxSpeed)
+			fmt.Printf("Acceleration: %f \n", player.acceleration)
+			fmt.Printf("Drag: %f \n", player.drag)
+			fmt.Printf("X Velocity: %f \n", player.xV)
+			fmt.Printf("Y Velocity: %f \n", player.yV)
+			fmt.Printf("Angular Velocity: %f \n", player.angularVelocity)
+			fmt.Printf("Current Angle Rad: %f \n", player.angleRad)
+			fmt.Printf("Current Angle Deg: %f \n\n\n\n", player.angleDeg)
+		}
 		if win.Pressed(pixelgl.KeyUp) {
 
 			player.xV +=
-				math.Cos(angle-(270*math.Pi)/180) * player.acceleration * dt
+				math.Cos(player.angleRad-(270*math.Pi)/180) * player.acceleration * dt
 			player.yV +=
-				math.Sin(angle-(270*math.Pi)/180) * player.acceleration * dt
+				math.Sin(player.angleRad-(270*math.Pi)/180) * player.acceleration * dt
 
 			if player.xV > player.maxSpeed {
 				player.xV = player.maxSpeed
@@ -145,22 +197,22 @@ func run() {
 
 		}
 
-		if angle == 0 {
-			angleInDegrees = 0
+		if player.angleRad == 0 {
+			player.angleDeg = 0
 		} else {
 
-			angleInDegrees = (angle) * 180 / math.Pi
+			player.angleDeg = (player.angleRad) * 180 / math.Pi
 		}
 
-		if angleInDegrees == 360 || angleInDegrees == -360 {
-			angle = 0
+		if player.angleDeg == 360 || player.angleDeg == -360 {
+			player.angleRad = 0
 		}
 
-		if angleInDegrees > 360 {
-			angle = angle - (360*math.Pi)/180
+		if player.angleDeg > 360 {
+			player.angleRad = player.angleRad - (360*math.Pi)/180
 		}
-		if angleInDegrees < -360 {
-			angle = angle + (360*math.Pi)/180
+		if player.angleDeg < -360 {
+			player.angleRad = player.angleRad + (360*math.Pi)/180
 		}
 
 		if player.x >= win.Bounds().Max.X-10 {
@@ -177,36 +229,9 @@ func run() {
 			player.yV = 25
 		}
 
-		player.x += player.xV * dt
-		player.y += player.yV * dt
+		playerAdjustSpeed(&player, dt)
 
-		if player.yV > 0 {
-			player.yV -= player.drag
-			if player.yV < 0 {
-				player.yV = 0
-			}
-		}
-
-		if player.yV < 0 {
-			player.yV += player.drag
-			if player.yV > 0 {
-				player.yV = 0
-			}
-		}
-
-		if player.xV > 0 {
-			player.xV -= player.drag
-			if player.xV < 0 {
-				player.xV = 0
-			}
-		}
-
-		if player.xV < 0 {
-			player.xV += player.drag
-			if player.xV > 0 {
-				player.xV = 0
-			}
-		}
+		playerDrag(&player)
 
 		win.Update()
 
@@ -218,9 +243,7 @@ func run() {
 			frames = 0
 		default:
 		}
-
 	}
-
 }
 
 func main() {