Computer Science Canada

Trying to make a parabolic jump trail for characters mario-like game :(
Author:  blackheart5598 [ Mon Jan 13, 2014 6:08 pm ]
Post subject:  Trying to make a parabolic jump trail for characters mario-like game :(
What is it you are trying to achieve?
I am trying to make a parabolic jump trail for my characters so that they don't all jump in the same way and height which makes it look awkward.


What is the problem you are having?
I am unable to do what I said above Sad


Describe what you have tried to solve this problem
I have tried using a parabolic formula of y=x**2 but that doesn't seem to work.


Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)
here is my jump procedure, if it is not enough i don't ming giving more information about my game. Thanks in advance

Turing:


procedure jump
    for count : 1 .. 180 by 5
        Input.KeyDown (chars)
        if chars ('d') then
            d := d + 25
            if (100 + d) >= 300 then
                picx := picx - 10
            end if
        end if
        if chars ('a') then
            d := d - 25
        end if
        if ((70 + d) <= 0) then
            d := 0

        end if
        if ((160 + d) >= maxx) then
            d := 1140

        end if
        w := 0
        w += 150 * (sind (count))
        Draw.FillOval (100 + d, 200 + round (w), 30, 40, 68)
        Draw.FillBox (72 + d, 240 + round (w), 160 + d, 230 + round (w), red)
        Draw.FillArc (102 + d, 240 + round (w), 30, 30, 0, 180, brightred)
        Draw.FillOval (87 + d, 210 + round (w), 5, 5, black)
        Draw.FillOval (115 + d, 210 + round (w), 5, 5, black)
        Draw.FillArc (105 + d, 190 + round (w), 10, 10, 0, 20, black)
        Draw.FillArc (100 + d, 190 + round (w), 10, 10, 160, 180, black)
        Draw.FillArc (105 + d, 175 + round (w), 15, 15, -30, 30, black)
        Draw.FillBox (70 + d, 90 + round (w), 130 + d, 160 + round (w), brightred)
        Draw.FillArc (105 + d, 160 + round (w), 25, 25, 0, 25, red)
        Draw.FillArc (95 + d, 160 + round (w), 25, 25, 155, 180, red)
        Draw.Line (70 + d, 90 + round (w), 70 + d, 30 + round (w), black)
        Draw.Line (100 + d, 90 + round (w), 100 + d, 30 + round (w), black)
        Draw.Line (101 + d, 90 + round (w), 101 + d, 30 + round (w), black)
        Draw.Line (130 + d, 90 + round (w), 130 + d, 30 + round (w), black)
        Draw.FillOval (60 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-40 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-140 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-240 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-340 + d, 50 + round (w), 20, 20, 68)
        Draw.FillBox (40 + d, 70 + round (w), 100 + d, 80 + round (w), red)
        Draw.FillBox (-60 + d, 70 + round (w), 0 + d, 80 + round (w), red)
        Draw.FillBox (-160 + d, 70 + round (w), -100 + d, 80 + round (w), red)
        Draw.FillBox (-260 + d, 70 + round (w), -200 + d, 80 + round (w), red)
        Draw.FillBox (-360 + d, 70 + round (w), -300 + d, 80 + round (w), red)

        View.Update
        delay (25)
        Draw.FillOval (100 + d, 200 + round (w), 30, 40, colorbg)
        Draw.FillBox (72 + d, 240 + round (w), 160 + d, 230 + round (w), colorbg)
        Draw.FillArc (102 + d, 240 + round (w), 30, 30, 0, 180, colorbg)
        Draw.FillOval (87 + d, 210 + round (w), 5, 5, colorbg)
        Draw.FillOval (115 + d, 210 + round (w), 5, 5, colorbg)
        Draw.FillArc (105 + d, 190 + round (w), 10, 10, 0, 20, colorbg)
        Draw.FillArc (100 + d, 190 + round (w), 10, 10, 160, 180, colorbg)
        Draw.FillArc (105 + d, 175 + round (w), 15, 15, -30, 30, colorbg)
        Draw.FillBox (70 + d, 90 + round (w), 130 + d, 160 + round (w), colorbg)
        Draw.FillArc (105 + d, 160 + round (w), 25, 25, 0, 25, colorbg)
        Draw.FillArc (95 + d, 160 + round (w), 25, 25, 155, 180, colorbg)
        Draw.Line (70 + d, 90 + round (w), 70 + d, 30 + round (w), colorbg)
        Draw.Line (100 + d, 90 + round (w), 100 + d, 30 + round (w), colorbg)
        Draw.Line (101 + d, 90 + round (w), 101 + d, 30 + round (w), colorbg)
        Draw.Line (130 + d, 90 + round (w), 130 + d, 30 + round (w), colorbg)
        Draw.FillOval (60 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-40 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-140 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-240 + d, 50 + round (w), 20, 20, 68)
        Draw.FillOval (-340 + d, 50 + round (w), 20, 20, 68)
        Draw.FillBox (40 + d, 70 + round (w), 100 + d, 80 + round (w), red)
        Draw.FillBox (-60 + d, 70 + round (w), 0 + d, 80 + round (w), red)
        Draw.FillBox (-160 + d, 70 + round (w), -100 + d, 80 + round (w), red)
        Draw.FillBox (-260 + d, 70 + round (w), -200 + d, 80 + round (w), red)
        Draw.FillBox (-360 + d, 70 + round (w), -300 + d, 80 + round (w), red)
        if (100 + d) >= 700 then
            picx := picx - 5
        end if
        if picx <= -2000 then
            picx := 0
        end if

        Pic.Draw (backgroundlevel1, picx, 0, picCopy)
    end for
end jump



Please specify what version of Turing you are using
latest version
Sad
Author:  keyboardwalker [ Mon Jan 13, 2014 8:59 pm ]
Post subject:  Re: Trying to make a parabolic jump trail for characters mario-like game :(
This may give you the desired effect and there isn't any exponentiation.
Turing:

const EARTHSGRAVITY := 9.80665
var ballXLoc, ballYLoc : real
var xVelocity, yVelocity : real

ballXLoc := 15
ballYLoc := 15

%Inceasing the xVelocity will change how far to the right the ball will go.
xVelocity := 30
%Inceasing the yVelocity will change how high the ball will go.
yVelocity := 70

loop
    drawfilloval (round (ballXLoc), round (ballYLoc), 5, 5, red)
    drawline (round (ballXLoc), round (ballYLoc), round (ballXLoc + xVelocity), round (ballYLoc + yVelocity), red)
    delay (50)

    %Moving the ball's location
    ballXLoc := ballXLoc + xVelocity
    ballYLoc := ballYLoc + yVelocity

    %Applying the force of gravity to the vertical component of the ball's velocity.
    yVelocity -= EARTHSGRAVITY %usually you would * mass but it's unecessary in this case.

    exit when ballXLoc < 0 or ballYLoc < 0
end loop
Author:  evildaddy911 [ Mon Jan 13, 2014 9:00 pm ]
Post subject:  RE:Trying to make a parabolic jump trail for characters mario-like game :(
youre looking at this wrong. its actually quite simple. here some psuedocode:
code:

y : real % the current height of the character
y_vel : real % how many units to move the character each time

y_velocity = 5
loop
    if y > ground
        y = y + y_velocity % move the character upwards 'y_vel'
        y_velocity = y_vel - 0.5 % decrement y_vel by a constant
    else
    y_vel = 0 % set y_vel to zero
end loop


EDIT: it seems somebody beat me to the punch...
Author:  Raknarg [ Mon Jan 13, 2014 9:07 pm ]
Post subject:  RE:Trying to make a parabolic jump trail for characters mario-like game :(
As the others have suggested, think about how gravity works in real life. It doesn't matter what your horizontal direction is, that will stay constant. However, what happens when you jump? You move upwards at a certain initial speed, and then the earth is pulling you down at a constant rate.

Try converting that into code.

If the player jumps, set the y direction speed up.

While the player is in the air (think about what that means in terms of x and y), constantly pull him towards the ground.

@keyboardwalker & evildaddy giving a new person in programming a bunch of code to help him out is giving him a fish instead of teaching him how o fish.

:


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