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quintin3

Fri Oct 08, 2010 7:54 pm


Brick Beaker Help

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What is it you are trying to achieve?



What is the problem you are having?
trying to get the ball to rebound and bounce at different angles


Describe what you have tried to solve this problem



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


View.Set ("graphics")
View.Set ("offscreenonly")
var chars : array char of boolean
var x, y : int
var midx := maxx div 2
var midy := maxy div 2
x := 250
y := 0

loop
    cls
    Input.KeyDown (chars)

    if chars (KEY_LEFT_ARROW) then
        x -= 1
    end if

    if chars (KEY_RIGHT_ARROW) then
        x += 1
    end if

    if x = maxx then
        x -= 190
    end if

    if midy = midy then
        midy -= 1
    end if

    if midy = then
        midy += 1
    end if

    Draw.FillOval (midx, midy, 10, 10, brightred)
    Draw.FillBox (x, y + 0, x + 125, y + 15, purple)
    View.Update
end loop



Please specify what version of Turing you are using
4.1.1


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DtY

Fri Oct 08, 2010 8:11 pm


RE:Brick Beaker Help

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What is it you are trying to achieve? 
What is the problem you are having? 
Describe what you have tried to solve this problem

They're there for a reason.


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quintin3

Fri Oct 08, 2010 8:51 pm


RE:Brick Beaker Help

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i said that


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DanShadow

Fri Oct 08, 2010 9:08 pm


Re: Brick Beaker Help

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trying to get the ball to rebound and bounce at different angles

Well.. your code hurts my eyes, so i'll just give you some pointers.

If your ball hits the outside of your screen (0 .. maxx, 0 .. maxy), you likely want it to move on an alternate vector.

For example:
Your ball is moving at a rate of +1 on the x-axis, and +1 to the y-axis through each loop iteration.
Your check the location of your ball relative to the boundaries of the screen (ie. < 0, or > maxx/maxy).
You find your ball has moved past the right of the screen (ball_x > maxx).
So rather than continuing moving  +1 on the x-axis, your change your vector to -1 on the x-axis.
Now your ball is still moving up, but in the opposite direction (it is bouncing off the side of the screen).

As for your box, you do a check to see if particular points of your ball have intersected the rectangle.
You can think of these points as Up, Down, Left & Right - each representing the center point on the Top, Bottom, Left & Right sides of your ball.
You do a check for each of these.

Has the bottom of your ball intersected the rectangle?
if it has, it is most likely moving on a downward vector, so you multiply your y-vector by -1, to make it "bounce" in the opposite direction.

As for checking if a side of the ball has intersected  your rectangle, you do this as follows:

[YOUR BALL]
Top Point = Center Point + 10 (on the y-axis)
Bottom Point = Center Point - 10 (on the y-axis)
Right Point = Center Point + 10 (on the x-axis)
Left Point = Center Point - 10 (on the x-axis)

The dimensions of your box are:
x, y, x + 125, y + 15

Here is how you check if your ball has intersected the box:
 
IF (x_point > box_ x) AND (x_point < box_x+125) AND (y_point > box_ y) AND (y_point < box_y+15) THEN
___you can confirm that your ball @ x_point / y_point is within the bounds of your box.

If you were looking for us to write the code for you, that's not what this web-site is about.
We help you figure out problems by giving your (potential) solutions. It's up to you to put those solutions to use ;)

Hope this helps.


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quintin3

Fri Oct 08, 2010 9:10 pm


RE:Brick Beaker Help

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thanks, 
and no, i was just expecting some tips :)


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DanShadow

Fri Oct 08, 2010 9:10 pm


RE:Brick Beaker Help

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Np :)