box moving across screen help

[paintking]

hey i need help making my box move across the screen and then when it gets to the end of the screen it needs to come back to the starting location altho i have no clue how to do that can any one help please this is what i have so far

code:

var box1_x1, box1_y1, box1_x2, box1_y2 : int var box2_x1, box2_y1, box2_x2, box2_y2 : int setscreen ("graphics: 500;300") box1_x1 := 100 box1_y1 := 100 box1_x2 := 200 box1_y2 := 200 locate (18,40) box2_x1 :=100 box2_y1 :=100 box2_x2 :=300 box2_y2 :=200 loop     cls     drawbox (box1_x1, box1_y1, box1_x2, box1_y2, 9)     delay (20)     box1_x1 += 1     box1_x2 += 1 end loop

thanx for the help if i get any

[HeavenAgain]

seems like everyone is doing this assignment, well stop and think for a second there. if (keyword) let say the box x reaches the maxx (keyword), instead of adding 1, you should subtract 1, correct? so use an if statement.

[CodeMonkey2000]

Before you make a new topic,please look at the first few threads, and make sure that you read through the Turing Walkthrough.

[Zampano]

Don't use a separate variable for each coordinate in the location of the box. Instead have one corner be related to the others by a small addition statement.
Also, use an increment to change the location of the x and y of the box, when the box reaches the end of the screen, an if will make the increment the negative of what it already is, thereby reversing the motion of the box.

EDIT: The posters above are correct, simple problems like these are done to death. Is there any way we could have a visible link to the complete tutorial on the home page?