OMG this is how you jump! - GameCreators Forum

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Phoenix Software

20

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Joined: 14th Nov 2005

Location: The Game Daemon Testing Labs :)

Posted: 5th Dec 2005 19:44

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Thanks to X_MEN I modded some of his code for the jumping. So flamers you can't say I didn't say where I got some code from!

`Basic Jumping Demo
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics

`Declare variables used
`variables for cords
xpos = 100
ypos = 350

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 30

`Hide the mouse pointer
hide mouse

`Start a new loop
do

`Clear screen so no flicker
cls

`Disable the escape key
disable escapekey

`You can show the pointer by clicking
`This is to avoid frustration to our player
if mouseclick() = 1 or mouseclick() = 2 then show mouse

`You can hide it again by pressing the enterkey
if returnkey() = 1 then hide mouse

`Draw the main character a green circle
ink rgb(0,255,0),1
circle xpos,ypos-jumping,10

`Configurate controls
if leftkey() = 1 then xpos = xpos - 7
if rightkey() = 1 then xpos = xpos + 7

`Jumping
if spacekey()=1 and jumping=0 then jump=1

if jump=1 then jumping=jumping+20
if jump=0 and jumping>0 then jumping=jumping-20

if jumping>60 then jump=0

if spacekey() = 0 then jump = 0

if rightkey() = 1 and jump = 1 then xpos = xpos + 4
if leftkey() = 1 and jump = 1 then xpos = xpos - 4

`Collision
if xpos <= 1 then xpos = xpos + 7

`Refresh the screen
sync

loop

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Upcoming Software: Phoenix RPG Creation Kit Release Date: February 2006 Using: DarkBASIC Classic

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Tapewormz

23

Years of Service

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Joined: 15th Sep 2002

Location: Winnipeg, Mantoba, Canada

Posted: 5th Dec 2005 20:35 Edited at: 5th Dec 2005 20:36

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Erm...There's a little code window down there or even the code tag button for stuff like this. It makes it easier to read the post when you use those features, when including code.

ie:

`Basic Jumping Demo 
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics

`Declare variables used
`variables for cords
xpos = 100
ypos = 350

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 30

`Hide the mouse pointer 
hide mouse

`Start a new loop
do

`Clear screen so no flicker
cls

`Disable the escape key
disable escapekey

`You can show the pointer by clicking
`This is to avoid frustration to our player
if mouseclick() = 1 or mouseclick() = 2 then show mouse

`You can hide it again by pressing the enterkey
if returnkey() = 1 then hide mouse

`Draw the main character a green circle
ink rgb(0,255,0),1
circle xpos,ypos-jumping,10

`Configurate controls
if leftkey() = 1 then xpos = xpos - 7
if rightkey() = 1 then xpos = xpos + 7

`Jumping
if spacekey()=1 and jumping=0 then jump=1

if jump=1 then jumping=jumping+20
if jump=0 and jumping>0 then jumping=jumping-20

if jumping>60 then jump=0

if spacekey() = 0 then jump = 0

if rightkey() = 1 and jump = 1 then xpos = xpos + 4
if leftkey() = 1 and jump = 1 then xpos = xpos - 4

`Collision 
if xpos <= 1 then xpos = xpos + 7

`Refresh the screen
sync

loop

+ Code Snippet

`Basic Jumping Demo 
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics


`Declare variables used
`variables for cords
xpos = 100
ypos = 350

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 30

`Hide the mouse pointer 
hide mouse

`Start a new loop
do

`Clear screen so no flicker
cls

`Disable the escape key
disable escapekey

`You can show the pointer by clicking
`This is to avoid frustration to our player
if mouseclick() = 1 or mouseclick() = 2 then show mouse

`You can hide it again by pressing the enterkey
if returnkey() = 1 then hide mouse

`Draw the main character a green circle
ink rgb(0,255,0),1
circle xpos,ypos-jumping,10

`Configurate controls
if leftkey() = 1 then xpos = xpos - 7
if rightkey() = 1 then xpos = xpos + 7

`Jumping
if spacekey()=1 and jumping=0 then jump=1

if jump=1 then jumping=jumping+20
if jump=0 and jumping>0 then jumping=jumping-20

if jumping>60 then jump=0

if spacekey() = 0 then jump = 0

if rightkey() = 1 and jump = 1 then xpos = xpos + 4
if leftkey() = 1 and jump = 1 then xpos = xpos - 4

`Collision 
if xpos <= 1 then xpos = xpos + 7

`Refresh the screen
sync

loop

MILKSHAPE3D VIDEO TUTORIALS
http://www.planetquake.com/polycount/cottages/blackboard/tutorials.htm

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Dexter

20

Years of Service

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Joined: 4th Nov 2005

Location: Ohio

Posted: 6th Dec 2005 18:37

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Credit goes to Tapewormz...

Who Dey Bengals

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Hamish McHaggis

23

Years of Service

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Joined: 13th Dec 2002

Location: Modgnik Detinu

Posted: 6th Dec 2005 23:06 Edited at: 6th Dec 2005 23:07

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Do you really jump like that? When I jump, I don't move at a constant speed upwards, then suddenly switch direction and travel at the same constant speed downwards. The world would be a very odd place indeed if that were the case.

Physics 101: In the world we live in, you are constantly accelerating towards the centre of the Earth (acceleration due to gravity), but this can be approximated as downwards in a simulation on this scale. The reason you jump is because you apply a force on the ground you are standing on. When you apply a force, the Earth applys an equal and opposite force against you. This force causes you to accelerate upwards and leave the ground. Since this force is applied for such a short amount of time, it can simple be simulated as a single increase in vertical velocity (an impulse). Once you have left the ground, you can no longer apply a force on the Earth, and so the only force acting on you is the gravitational force. This force causes your vertical velocity to steadily decrease to 0, this point is the peak of your jump. Your velocity will then start to increase the opposite way (this can be simulated as a negative velocity), as you accelerate towards the Earth. When you hit the ground again, a force is applied which stops your acceleration, and keeps you steady. It would be easier in the simulation just to set the vertical position to the ground level, and vertical velocity to 0 if you are below the ground.

This is actually how jumping should be simulated:

`Basic Jumping Demo 
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics

`Declare variables used
`variables for cords
xpos# = 100.0
ypos# = 350.0
xvel# = 0.0
yvel# = 0.0
grav# = -0.2
jumpimpulse# = 10.0

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 60

`Hide the mouse pointer 
hide mouse

`Disable the escape key
disable escapekey

`Start a new loop
do
	`You can show the pointer by clicking
	`This is to avoid frustration to our player
	if mouseclick() = 1 or mouseclick() = 2 then show mouse
	
	`You can hide it again by pressing the enterkey
	if returnkey() = 1 then hide mouse
	
	`Sideways controls
	xvel# = 0.0
	if leftkey() = 1 then xvel# = -7
	if rightkey() = 1 then xvel# = 7
	
	`Jumping
	if spacekey()=1 and jumping=0
		yvel# = yvel# + jumpimpulse#
		jumping = 1
	endif
	
	`Acceleration due to gravity
	yvel# = yvel#+grav#
	`Increase position by velocity
	xpos# = xpos#+xVel#
	ypos# = ypos#+yVel#

`If ball is below ground, move it above ground and set velocity to 0	
	if ypos# < 10.0
		ypos# = 10.0
		yvel# = 0.0
		jumping = 0
	endif

`Draw the main character a green circle
	ink rgb(0,255,0),1
	circle xpos#,480-ypos#,10
	
	`Refresh the screen
	sync
	`Clear screen so no flicker
	cls
loop

+ Code Snippet

`Basic Jumping Demo 
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics

`Declare variables used
`variables for cords
xpos# = 100.0
ypos# = 350.0
xvel# = 0.0
yvel# = 0.0
grav# = -0.2
jumpimpulse# = 10.0

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 60

`Hide the mouse pointer 
hide mouse

`Disable the escape key
disable escapekey

`Start a new loop
do
	`You can show the pointer by clicking
	`This is to avoid frustration to our player
	if mouseclick() = 1 or mouseclick() = 2 then show mouse
	
	`You can hide it again by pressing the enterkey
	if returnkey() = 1 then hide mouse
	
	`Sideways controls
	xvel# = 0.0
	if leftkey() = 1 then xvel# = -7
	if rightkey() = 1 then xvel# = 7
	
	`Jumping
	if spacekey()=1 and jumping=0
		yvel# = yvel# + jumpimpulse#
		jumping = 1
	endif
	
	`Acceleration due to gravity
	yvel# = yvel#+grav#
	`Increase position by velocity
	xpos# = xpos#+xVel#
	ypos# = ypos#+yVel#

	`If ball is below ground, move it above ground and set velocity to 0	
	if ypos# < 10.0
		ypos# = 10.0
		yvel# = 0.0
		jumping = 0
	endif

	`Draw the main character a green circle
	ink rgb(0,255,0),1
	circle xpos#,480-ypos#,10
	
	`Refresh the screen
	sync
	`Clear screen so no flicker
	cls
loop

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Takeshii

22

Years of Service

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Joined: 15th Feb 2004

Location:

Posted: 7th Dec 2005 19:17 Edited at: 7th Dec 2005 19:19

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Well then, if you want to be specific, there is wind resistance, and you cannot change direction while in motion unless acted upon from another force...

`Basic Jumping Demo
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics

`Declare variables used
`variables for cords
xpos# = 100.0
ypos# = 350.0
xvel# = 0.0
yvel# = 0.0
grav# = -0.2
jumpimpulse# = 10.0

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 60

`Hide the mouse pointer
hide mouse

`Disable the escape key

`Start a new loop
do
   `You can show the pointer by clicking
   `This is to avoid frustration to our player
   if mouseclick() = 1 or mouseclick() = 2 then show mouse

`You can hide it again by pressing the enterkey
   if returnkey() = 1 then hide mouse

`Sideways controls
   if jumping = 0
   xvel# = 0.0
   if leftkey() = 1 then xvel# = -7
   if rightkey() = 1 then xvel# = 7
   endif
   if jumping = 1 and xvel# > 0
      xvel# = xvel# - 0.05
   endif
   if jumping = 1 and xvel# < 0
      xvel# = xvel# + 0.05
   endif
   `Jumping
   if spacekey()=1 and jumping=0
      yvel# = yvel# + jumpimpulse#
      jumping = 1
   endif

`Acceleration due to gravity
   yvel# = yvel#+grav#
   `Increase position by velocity
   xpos# = xpos#+xVel#
   ypos# = ypos#+yVel#

`If ball is below ground, move it above ground and set velocity to 0
   if ypos# < 10.0
      ypos# = 10.0
      yvel# = 0.0
      jumping = 0
   endif

`Draw the main character a green circle
   ink rgb(0,255,0),1
   circle xpos#,480-ypos#,10
   PRINT yvel#
   PRINT xvel#
   print ypos#
   print xpos#

`Refresh the screen
   sync
   `Clear screen so no flicker
   cls
loop

+ Code Snippet

`Basic Jumping Demo
`Programmed By: **Name Erased**
`Version: 1.0 - Bulit in Graphics

`Declare variables used
`variables for cords
xpos# = 100.0
ypos# = 350.0
xvel# = 0.0
yvel# = 0.0
grav# = -0.2
jumpimpulse# = 10.0

`Setup the framerate and window

`Intalize the window setup
set window on
set window title "Basic Jumping Demo - DBC - **Insert Your Name Here**"
set window layout 1,1,1
set window position 100,200
set window size 640,480

`Configurate the framerate
sync on
sync rate 60

`Hide the mouse pointer
hide mouse

`Disable the escape key

`Start a new loop
do
   `You can show the pointer by clicking
   `This is to avoid frustration to our player
   if mouseclick() = 1 or mouseclick() = 2 then show mouse

   `You can hide it again by pressing the enterkey
   if returnkey() = 1 then hide mouse

   `Sideways controls
   if jumping = 0
   xvel# = 0.0
   if leftkey() = 1 then xvel# = -7
   if rightkey() = 1 then xvel# = 7
   endif
   if jumping = 1 and xvel# > 0
      xvel# = xvel# - 0.05
   endif
   if jumping = 1 and xvel# < 0
      xvel# = xvel# + 0.05
   endif
   `Jumping
   if spacekey()=1 and jumping=0
      yvel# = yvel# + jumpimpulse#
      jumping = 1
   endif

   `Acceleration due to gravity
   yvel# = yvel#+grav#
   `Increase position by velocity
   xpos# = xpos#+xVel#
   ypos# = ypos#+yVel#

   `If ball is below ground, move it above ground and set velocity to 0
   if ypos# < 10.0
      ypos# = 10.0
      yvel# = 0.0
      jumping = 0
   endif

   `Draw the main character a green circle
   ink rgb(0,255,0),1
   circle xpos#,480-ypos#,10
   PRINT yvel#
   PRINT xvel#
   print ypos#
   print xpos#

   `Refresh the screen
   sync
   `Clear screen so no flicker
   cls
loop

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TDK I Love you...... And yes, you should be scared

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Hamish McHaggis

23

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Joined: 13th Dec 2002

Location: Modgnik Detinu

Posted: 7th Dec 2005 23:09

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Yeah yeah, you could get as complicated as you like, and admittedly in a real game you would not have your character suddenly changing direction in mid-air. However, many games do allow you to have some control over the movement of your characters while they are in the air, just for the playability factor. However, proper vertical jumping motion is included in most games. Jerky up and down is so easy to correct, and actually makes things harder to handle in the long term.

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Takeshii

22

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Joined: 15th Feb 2004

Location:

Posted: 8th Dec 2005 01:06

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"many games do allow you to have some control over the movement of your characters while they are in the air"

Hehe...ya. Some even let you double-jump

.

In my early days I had lots of problems with jerky motions, as I added more and more laws of motion. Then I got smart did all the math with solver variables and then the amount stored in those vars are added subtracted devided and whatnot from/to the acutual movement vars.

MMMmmm...

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TDK I Love you...... And yes, you should be scared

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2D All the way! / OMG this is how you jump!