Code Sketch

cleari()
drawStage(Color(135, 206, 250)) // Sky blue stage background
val cb = canvasBounds

var truckX = cb.x + 100
var truckY = cb.y + 50
var obstacleX = cb.x + cb.width
var score = 0
var isJumping = false
var jumpVelocity = 0.0

// Build the truck using Kojo's Picture graphics API
val truckBody = fillColor(red) -> Picture.rectangle(90, 35)
val truckCab = fillColor(blue) -> Picture.rectangle(45, 30)
val wheel1 = fillColor(black) -> Picture.circle(10)
val wheel2 = fillColor(black) -> Picture.circle(10)

val truck = GPics(
  truckBody,
  trans(45, 35) -> truckCab,
  trans(20, -10) -> wheel1,
  trans(70, -10) -> wheel2
)

// Build the obstacle (Rock)
val obstacle = fillColor(darkGray) -> Picture.rectangle(25, 30)

// Initial positioning on the canvas
truck.setPosition(truckX, truckY)
obstacle.setPosition(obstacleX, truckY)

draw(truck, obstacle)

// Main animation game loop running ~50 times per second
animate {
  // Check for UP arrow key press to jump
  if (isKeyPressed(Kc.VK_UP) && !isJumping) {
    isJumping = true
    jumpVelocity = 16.0
  }
  
  // Apply jump physics and gravity
  if (isJumping) {
    truckY += jumpVelocity
    jumpVelocity -= 1.0 // Gravity pulls down
    if (truckY <= cb.y + 50) {
      truckY = cb.y + 50
      isJumping = false
    }
  }

  // Move the obstacle from right to left
  obstacleX -= 8.0
  if (obstacleX < cb.x - 50) {
    obstacleX = cb.x + cb.width + (math.random * 100)
    score += 1
  }

  // Update object coordinates on screen
  truck.setPosition(truckX, truckY)
  obstacle.setPosition(obstacleX, cb.y + 50)

  // Collision check between the truck and the obstacle
  if (truck.collidesWith(obstacle)) {
    score = 0 // Reset score on crash
    obstacleX = cb.x + cb.width
  }
}