You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/raylib-go/examples/shapes/collision_area
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"

	rl "github.com/gen2brain/raylib-go/raylib"
)

var (
	screenWidth  = int32(1280)
	screenHeight = int32(720)

	pause     = false
	collision = false

	boxCollision     = rl.Rectangle{}
	screenUpperLimit = float32(40)
	boxAspeedX       = float32(4)
)

func main() {

	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - collision area")

	rl.SetTargetFPS(60)

	boxA := rl.NewRectangle(10, float32(rl.GetScreenHeight()/2)-50, 200, 100)
	boxB := rl.NewRectangle(float32(rl.GetScreenWidth()/2)-30, float32(rl.GetScreenHeight()/2)-30, 60, 60)

	for !rl.WindowShouldClose() {

		mousePos := rl.GetMousePosition()

		if !pause {
			boxA.X += boxAspeedX
		}
		if boxA.X+boxA.Width >= float32(rl.GetScreenWidth()) || boxA.X <= 0 {
			boxAspeedX *= -1
		}

		boxB.X = mousePos.X - boxB.Width/2
		boxB.Y = mousePos.Y - boxB.Height/2

		if boxB.X+boxB.Width >= float32(rl.GetScreenWidth()) {
			boxB.X = float32(rl.GetScreenWidth()) - boxB.Width
		} else if boxB.X <= 0 {
			boxB.X = 0
		}

		if boxB.Y+boxB.Height >= float32(rl.GetScreenHeight()) {
			boxB.Y = float32(rl.GetScreenHeight()) - boxB.Height
		} else if boxB.X <= screenUpperLimit {
			boxB.Y = screenUpperLimit
		}

		collision := rl.CheckCollisionRecs(boxA, boxB)

		if collision {
			boxCollision = rl.GetCollisionRec(boxA, boxB)
		}

		if rl.IsKeyPressed(rl.KeySpace) {
			pause = !pause
		}

		rl.BeginDrawing()
		rl.ClearBackground(rl.RayWhite)

		if collision {
			rl.DrawRectangle(0, 0, screenWidth, int32(screenUpperLimit), rl.Red)
			rl.DrawRectangleRec(boxCollision, rl.Lime)
			rl.DrawText("COLLISION", int32(rl.GetScreenWidth()/2)-(rl.MeasureText("COLLISION", 20)/2), int32(screenUpp
    
func main() {

	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - collision area")

	rl.SetTargetFPS(60)

	boxA := rl.NewRectangle(10, float32(rl.GetScreenHeight()/2)-50, 200, 100)
	boxB := rl.NewRectangle(float32(rl.GetScreenWidth()/2)-30, float32(rl.GetScreenHeight()/2)-30, 60, 60)

	for !rl.WindowShouldClose() {

		mousePos := rl.GetMousePosition()

		if !pause {
			boxA.X += boxAspeedX
		}
		if boxA.X+boxA.Width >= float32(rl.GetScreenWidth()) || boxA.X <= 0 {
			boxAspeedX *= -1
		}

		boxB.X = mousePos.X - boxB.Width/2
		boxB.Y = mousePos.Y - boxB.Height/2

		if boxB.X+boxB.Width >= float32(rl.GetScreenWidth()) {
			boxB.X = float32(rl.GetScreenWidth()) - boxB.Width
		} else if boxB.X <= 0 {
			boxB.X = 0
		}

		if boxB.Y+boxB.Height >= float32(rl.GetScreenHeight()) {
			boxB.Y = float32(rl.GetScreenHeight()) - boxB.Height
		} else if boxB.X <= screenUpperLimit {
			boxB.Y = screenUpperLimit
		}

		collision := rl.CheckCollisionRecs(boxA, boxB)

		if collision {
			boxCollision = rl.GetCollisionRec(boxA, boxB)
		}

		if rl.IsKeyPressed(rl.KeySpace) {
			pause = !pause
		}

		rl.BeginDrawing()
		rl.ClearBackground(rl.RayWhite)

		if collision {
			rl.DrawRectangle(0, 0, screenWidth, int32(screenUpperLimit), rl.Red)
			rl.DrawRectangleRec(boxCollision, rl.Lime)
			rl.DrawText("COLLISION", int32(rl.GetScreenWidth()/2)-(rl.MeasureText("COLLISION", 20)/2), int32(screenUpperLimit/2)-10, 20, rl.Black)
			rl.DrawText("Collision Area: "+fmt.Sprint(boxCollision.Width*boxCollision.Height), int32(rl.GetScreenWidth()/2)-100, int32(screenUpperLimit+10), 20, rl.Black)
		} else {
			rl.DrawRectangle(0, 0, screenWidth, int32(screenUpperLimit), rl.Black)
		}

		rl.DrawRectangleRec(boxA, rl.Orange)
		rl.DrawRectangleRec(boxB, rl.Blue)

		rl.DrawText("Press SPACE to PAUSE/RESUME", 20, int32(rl.GetScreenHeight())-35, 20, rl.Black)

		rl.EndDrawing()

	}

	rl.CloseWindow()
}