Refactor playerCurrentSpeed; refactor player data into struct

main.go

@@ -14,6 +14,18 @@ import (
 	"golang.org/x/image/colornames"
 )
 
+type Player struct {
+	sprite *pixel.Sprite
+	x, y,
+	drag,
+	maxSpeed,
+	xV,
+	yV,
+	angularVelocity,
+	acceleration float64
+	vec pixel.Vec
+}
+
 func loadSprite(path string) (pixel.Picture, error) {
 	file, err := os.Open(path)
 	if err != nil {
@@ -56,10 +68,20 @@ func run() {
 	if err != nil {
 		panic(err)
 	}
+
 	shipFrames := createSpriteSheet(spritesheet, 256, 256)
 
-	player := pixel.NewSprite(spritesheet, shipFrames[0])
-
+	var player Player
+	player.x = win.Bounds().Max.X / 2
+	player.y = win.Bounds().Max.Y / 8
+	player.sprite = pixel.NewSprite(spritesheet, shipFrames[0])
+	player.maxSpeed = 350
+	player.acceleration = 600 //0.15 * player.maxSpeed
+	player.drag = 1
+	player.xV = 0
+	player.yV = 0
+	player.vec.X = player.x
+	player.vec.Y = player.y
 	var angle float64 = 0.0
 	var angleInDegrees float64 = 0
 
@@ -68,17 +90,6 @@ func run() {
 		second = time.Tick(time.Second)
 	)
 
-	playerX := win.Bounds().Max.X / 2
-	playerY := win.Bounds().Max.Y / 8
-
-	var playerTopSpeed float64 = 350
-	var playerAcceleration float64 = 0.15 * playerTopSpeed
-	var playerCurrentSpeed float64 = 0
-	var playerDrag float64 = 1
-	var playerXVelocity float64 = 0
-	var playerYVelocity float64 = 0
-	var myVec = pixel.Vec{playerX, playerY}
-
 	last := time.Now()
 	for !win.Closed() {
 		dt := time.Since(last).Seconds()
@@ -86,14 +97,14 @@ func run() {
 
 		win.Clear(colornames.Whitesmoke)
 
-		myVec = pixel.Vec{playerX, playerY}
+		player.vec = pixel.Vec{player.x, player.y}
 
 		mat := pixel.IM
 		mat = mat.Rotated(pixel.ZV, angle)
 		mat = mat.Scaled(pixel.ZV, 0.25)
-		mat = mat.Moved(myVec)
+		mat = mat.Moved(player.vec)
 
-		player.Draw(win, mat)
+		player.sprite.Draw(win, mat)
 
 		if win.Pressed(pixelgl.KeyLeft) {
 
@@ -109,27 +120,24 @@ func run() {
 		}
 
 		if win.Pressed(pixelgl.KeyUp) {
-			if playerCurrentSpeed < playerTopSpeed {
-				playerCurrentSpeed += playerAcceleration
+
+			player.xV +=
+				math.Cos(angle-(270*math.Pi)/180) * player.acceleration * dt
+			player.yV +=
+				math.Sin(angle-(270*math.Pi)/180) * player.acceleration * dt
+
+			if player.xV > player.maxSpeed {
+				player.xV = player.maxSpeed
+			}
+			if player.xV < player.maxSpeed*-1 {
+				player.xV = player.maxSpeed * -1
 			}
 
-			playerXVelocity +=
-				math.Cos(angle-(270*math.Pi)/180) * playerCurrentSpeed * dt
-			playerYVelocity +=
-				math.Sin(angle-(270*math.Pi)/180) * playerCurrentSpeed * dt
-
-			if playerXVelocity > playerTopSpeed {
-				playerXVelocity = playerTopSpeed
+			if player.yV > player.maxSpeed {
+				player.yV = player.maxSpeed
 			}
-			if playerXVelocity < playerTopSpeed*-1 {
-				playerXVelocity = playerTopSpeed * -1
-			}
-
-			if playerYVelocity > playerTopSpeed {
-				playerYVelocity = playerTopSpeed
-			}
-			if playerYVelocity < playerTopSpeed*-1 {
-				playerYVelocity = playerTopSpeed * -1
+			if player.yV < player.maxSpeed*-1 {
+				player.yV = player.maxSpeed * -1
 			}
 
 		}
@@ -155,56 +163,48 @@ func run() {
 			angle = angle + (360*math.Pi)/180
 		}
 
-		if playerCurrentSpeed > 0 {
-			playerCurrentSpeed -= playerDrag * dt
+		if player.x >= win.Bounds().Max.X-10 {
+			player.xV = -25
+		}
+		if player.x <= win.Bounds().Min.X+10 {
+			player.xV = 25
 		}
 
-		if playerCurrentSpeed < 0 {
-			playerCurrentSpeed = 0
+		if player.y >= win.Bounds().Max.Y-10 {
+			player.yV = -25
+		}
+		if player.y <= win.Bounds().Min.Y+10 {
+			player.yV = 25
 		}
 
-		if playerX >= win.Bounds().Max.X-10 {
-			playerXVelocity = -25
-		}
-		if playerX <= win.Bounds().Min.X+10 {
-			playerXVelocity = 25
-		}
+		player.x += player.xV * dt
+		player.y += player.yV * dt
 
-		if playerY >= win.Bounds().Max.Y-10 {
-			playerYVelocity = -25
-		}
-		if playerY <= win.Bounds().Min.Y+10 {
-			playerYVelocity = 25
-		}
-
-		playerX += playerXVelocity * dt
-		playerY += playerYVelocity * dt
-
-		if playerYVelocity > 0 {
-			playerYVelocity -= playerDrag
-			if playerYVelocity < 0 {
-				playerYVelocity = 0
+		if player.yV > 0 {
+			player.yV -= player.drag
+			if player.yV < 0 {
+				player.yV = 0
 			}
 		}
 
-		if playerYVelocity < 0 {
-			playerYVelocity += playerDrag
-			if playerYVelocity > 0 {
-				playerYVelocity = 0
+		if player.yV < 0 {
+			player.yV += player.drag
+			if player.yV > 0 {
+				player.yV = 0
 			}
 		}
 
-		if playerXVelocity > 0 {
-			playerXVelocity -= playerDrag
-			if playerXVelocity < 0 {
-				playerXVelocity = 0
+		if player.xV > 0 {
+			player.xV -= player.drag
+			if player.xV < 0 {
+				player.xV = 0
 			}
 		}
 
-		if playerXVelocity < 0 {
-			playerXVelocity += playerDrag
-			if playerXVelocity > 0 {
-				playerXVelocity = 0
+		if player.xV < 0 {
+			player.xV += player.drag
+			if player.xV > 0 {
+				player.xV = 0
 			}
 		}
 
@@ -214,7 +214,7 @@ func run() {
 		select {
 		case <-second:
 			win.SetTitle(fmt.Sprintf("%s | FPS: %d | playerYSpeed: %f", cfgMain.Title,
-				frames, playerYVelocity))
+				frames, player.yV))
 			frames = 0
 		default:
 		}