Calculation of a ball move to a certain coordinate.

8749236 · **Posted:** Tue Mar 08, 2011 1:25 pm

What is it you are trying to achieve?
I'm trying to write a program, it will draw a ball, and move it to any coordinate

What is the problem you are having?
i got calculation problem, i don't know how to do the calculation to make the ball move to the coordinate i want

Describe what you have tried to solve this problem
i have tried to calculate the slope between the ball's coordiante and the target's coordinate, but the mostly the numbers don't have a GCF..

Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)
<Answer Here>

Turing:

var numOfObject : int := 5
var targetX, targetY : int
var objectX, objectY : array 1 .. numOfObject of int
var speedToTargetX, speedToTargetY : array 1 .. numOfObject of int

View.Set ("offscreenonly")

procedure drawObject

for i : 1 .. numOfObject
drawfilloval (objectX (i), objectY (i), 2, 2, black)
end for

end drawObject

procedure drawTarget

drawfillstar (targetX, targetY, targetX + 15, targetY + 15, blue)

end drawTarget

loop

for i : 1 .. numOfObject
randint (objectX (i), 1, 639)
randint (objectY (i), 350, 800)

randint (targetX, 1, 639)
randint (targetY, 10, 150)
end for

for i : 1 .. numOfObject
speedToTargetX (i) := round ((objectX (i) - targetX) / 120)
speedToTargetY (i) := round ((objectY (i) - targetY) / 120)
end for

loop
for i : 1 .. numOfObject

drawObject
drawTarget

/*
put speedToTargetX
put speedToTargetY
put objectX
put objectY
put targetX
put targetY
*/

objectX (i) := objectX (i) - speedToTargetX (i)
objectY (i) := objectY (i) - speedToTargetY (i)

View.Update
Time.Delay (1)
cls
end for
end loop
end loop

Please specify what version of Turing you are using
Turing 4.1

DemonWasp · **Posted:** Tue Mar 08, 2011 2:06 pm

You want to use the real variable type. This will let you represent numbers like 1.2, 3.1415, or 0.1113. You can then represent your slope was a "real" variable.

You will also need to look at the round(), floor() or ceil() functions to convert real numbers back into integers for drawing coordinates.

Grim · **Posted:** Tue Mar 08, 2011 7:12 pm

There are common algorithms that compute the shortest path between two points.

8749236 · **Posted:** Wed Mar 09, 2011 10:27 am

ok..
i'll try...
and.. what is 'floor' and 'ceil' function?

DemonWasp · **Posted:** Wed Mar 09, 2011 10:34 am

Look them up in the Turing help.

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