PREVIEW: Before we get started making our very first program, let's look at an example.
- This program creates a ball and net, then draws a line between them.
- You are asked to estimate the slope of the line.
- If your guess is close, score! If not....watch where the ball goes! The actual slope will be displayed onscreen.
- Click Run to try again, and Submit and Next to continue.
#Set the grid and background
stage.set_axis(100)
stage.create_grid_overlay(10, "grey")
stage.set_background("soccerfield")
#Create coordinates for ball, create ball
ballx = -90
bally = random.randint(-100, 100)
ball = codesters.Sprite("soccerball", ballx, bally)
#Create coordinates for net, create net
netx = 80
nety = random.randint(-100, 100)
net = codesters.Sprite("soccernet", 80,nety)
net.flip_right_left()
#Draw line between ball and net
line = codesters.Line(-90, bally, 80, nety, "blue")
slopeguess = float(line.ask("What is the slope of the line?"))
#Calculate slope
rise = nety-bally
run = netx-ballx
slope = rise/run
#Display slope
# sprite = codesters.Text("text", x, y)
sprite = codesters.Text(slope, 0, 30)
#Calculate new point for ball
newrise = (slopeguess*run)
endy = bally + newrise
ball.glide_to(netx, endy)
