''' Name: Sajjan Singh Mehta Recitation Assignment #6 11/14/2007 PHYS 113-002 Recitation Class #2 ''' from visual import * from random import * # Runtime constants m = 1.2 # Mass of the "horseshoe" ring/torus g = vector(0, -9.8) # The graviational acceleration as a vector C = 1 # Drag coefficient rho = 1.3 # Density of the air r = 0.75 # Radius of "horseshoe" ring width = 0.2 # Thickness of "horseshoe" ring A = 0.05 # Surface area of the "horseshoe" ring #A = 4 * pi**2 * width * (r - width) dt = 0.01 # Time interval for run score = 0 # Keeps track of the score # Set up window properties scene = display(title = 'Horseshoes', width = 640, height = 480, center = (25, 0, 0), forward = (0, -0.30, -1), range = (40, 40, 30), x = 0, y = 0) # The ground as a plane ground = box(pos = (25, 0), length = 60, height = 0.25, width = 30, color = (0.2, 0.8, 0.2)) # Horseshoe object as a torus horseshoe = ring(pos = vector(0, 0), p = vector(0, 0), radius = r, thickness = width, axis = (0, 1), trail = curve(color = color.red), ideal_pos = vector(0, 0), ideal_p = vector(0, 0), ideal_trail = curve(color = color.blue)) # The target for the horseshoe target = cylinder(pos = vector(0, 0), axis = (0, 2, 0), radius = r, color = (0.6, 0.6, 0.6)) # Your player, represented by a cone player = cone(pos = (0, 0), axis = (0, 5, 0), radius = 2 * r, color = (0.6, 1, 0.6)) # Label showing the initial velocities selcted info = label(pos = (0, 20, 0), color = color.white, linecolor = color.black, height = 11) # Displays the current score score_label = label(pos = (50, 25, 0), color = color.white, height = 11, linecolor = color.black, text = 'Score: '+ str(score)) # Displays the result of a game round after a hit or miss result_label = label(pos = (25, -20, 0), height = 24, linecolor = color.black, color = color.white) # Displays the help button help = label(pos = (0, -30, 0), height = 11, linecolor = color.blue, color = color.white, font = 'Arial', text = 'Help? (in console)') help_box = box(pos = vector(0, -29, 1), length = 14, height = 4, width = 0.1, color = color.black) # Set the scene properties scene.autoscale = 0 scene.userspin = 0 # Allows the user to choose the initial velocity of the horseshoe # using a ray to indicate the velocity's vector form def chooseInitialVelocity(): global info, target, help_box posRay = arrow(pos = (0, 0), axis = (0, 0), shaftwidth = 0.2, fixedwidth = 1, color = color.blue) while True: posRay.axis = scene.mouse.pos info.text = 'Initial Velocity (m/s):\nVx = '+ str(scene.mouse.pos.x) +'\nVy = '+ str(scene.mouse.pos.y) if scene.mouse.clicked: e = scene.mouse.getclick() if e.pick == target: randomizeTarget() elif e.pick == help_box: showHelp() elif e.pos.x > 0 and e.pos.y > 0: posRay.visible = 0 return e.pos.x, e.pos.y # Resets the game values to its initial conditions def resetGame(): global horseshoe, target, result_label # Reset the horseshoe's position and momentum horseshoe.pos = horseshoe.ideal_pos = vector(0, 0) horseshoe.p = horseshoe.ideal_p = vector(0, 0) # Is there an easier way to reset/clear the curves than this? horseshoe.trail.visible = False horseshoe.trail = curve(color = color.red) horseshoe.ideal_trail.visible = False horseshoe.ideal_trail = curve(color = color.blue) result_label.visible = False # Places the target in a random location def randomizeTarget(): global target target.x = random() * 50 target.y = random() * 5 # Shows a little animation for when the user hits the target def flashTarget(): global target for i in xrange(10): rate(5) if i % 2 == 0: target.color = color.yellow else: target.color = color.blue target.color = (0.6, 0.6, 0.6) # Runs the animation of the horseshoe's projectile motion def runMotion(vx, vy): global horseshoe, target # Set the horseshoe's initial momentum and trails horseshoe.p = m * vector(vx, vy) horseshoe.ideal_p = m * vector(vx, vy) horseshoe.trail.append(horseshoe.pos) horseshoe.ideal_trail.append(horseshoe.ideal_pos) while True: rate(75) # Update the horseshoe's position and trail curves horseshoe.pos += dt * horseshoe.p / m horseshoe.trail.append(horseshoe.pos) horseshoe.ideal_pos += dt * horseshoe.ideal_p / m horseshoe.ideal_trail.append(horseshoe.ideal_pos) # Account for the force of gravity horseshoe.p += dt * (m * g) horseshoe.ideal_p += dt * (m * g) # Account for air resistance v = horseshoe.p / m v_hat = v / mag(v) horseshoe.p += dt * (0.5 * C * rho * A * mag(v)**2) * -v_hat # Return whether the horseshoe landed within range of the target dy = r if horseshoe.y - target.y > 0: dy += target.axis.y if abs(horseshoe.y - target.y) < dy and abs(horseshoe.x - target.x) < r: return True elif horseshoe.y < 0: return False # Prompt the user whether to carry on playing or to quit def promptUserAction(): global scene, score, help_box cont = label(pos = (58, -30, 0), height = 11, linecolor = color.blue, color = color.white, font = 'Arial', text = 'Continue') cont_box = box(pos = vector(57, -29, 1), length = 7.5, height = 4, width = 0.1, color = color.black) quit = label(pos = (66, -30, 0), height = 11, linecolor = color.blue, color = color.white, font = 'Arial', text = 'Quit') quit_box = box(pos = vector(65, -29, 1), length = 4, height = 4, width = 0.1, color = color.black) while True: if scene.mouse.clicked: e = scene.mouse.getclick() if e.pick == help_box: showHelp() elif e.pick == cont_box: cont.visible = cont_box.visible = False quit.visible = quit_box.visible = False return True elif e.pick == quit_box: cont.visible = cont_box.visible = False quit.visible = quit_box.visible = False return False # Show the help popup def showHelp(): print '==========\n Help\n==========' print 'The object of the game is to aim the horseshoe and hit the' print 'target. To do so, move your arrow around with your mouse' print 'to set the initial velocity of the horsehoe; the vector' print 'components of velocity should be visible in the top-left' print 'corner of the screen. If you hit the target, you will receive' print 'a point and the target\'s position will re-randomize. If you' print 'miss, a point will be deducted and you will have another turn' print 'on the current target. Clicking the target will randomize' print 'its position. You have the option to continue or quit at the' print 'end of each round you play. Have fun!\n' # Perform an initial randomization of the target randomizeTarget() while True: # Reset the game values and wait for the user to choose the initial velocity resetGame() vx, vy = chooseInitialVelocity() # Performs the appropriate actions if the user hits the target or not targetHit = runMotion(vx, vy) if targetHit: flashTarget() score += 1 score_label.text = 'Score: '+ str(score) result_label.color = color.green result_label.visible = True result_label.text = 'Nice work, you hit the target!' else: score -= 1 score_label.text = 'Score: '+ str(score) result_label.color = color.red result_label.visible = True result_label.text = 'Bad luck, try again' if not promptUserAction(): print 'Final Score: '+ str(score) +'. Thanks for playing!' scene.visible = False sys.exit(0) else: if targetHit: randomizeTarget()