View more

View more

View more

### Image of the Day Submit

IOTD | Top Screenshots

### The latest, straight to your Inbox.

Subscribe to GameDev.net Direct to receive the latest updates and exclusive content.

# I want to make the little dude jump

Old topic!

Guest, the last post of this topic is over 60 days old and at this point you may not reply in this topic. If you wish to continue this conversation start a new topic.

2 replies to this topic

### #1Anonymous Poster_Anonymous Poster_*  Guests

Posted 29 July 1999 - 03:46 PM

Hi
I am trying to make a mario bros style game using DirectX. All is going fine except I am having trouble making my little character jump and fall again.

Any help would be cool.

### #2felisandria  Members

Posted 23 July 1999 - 04:44 AM

To fall, you need to have your tiles designated as "solid" and "not solid". When your character is over a "not solid" tile, you move him in the negative y direction while moving him in the x direction according to key presses (assuming you're using key presses to control) as usual. Note that this is the mario-specific way to do things, some games don't allow you to change the direction of your fall, they just calculated the angle of fall when you hit the edge and drop you that way.
For jumping it's more or less the same idea as falling, except for the fact that you go in the positive y direction until you reach a certain height, then you go in the negative y direction until you are back on a "solid" tile. Make sure that the positive amount of y you jump is relative to your starting y, otherwise you will be unable to jump over a certain height regardless of where you are on screen if you do it relative to a set screen bottom, or if you do it relative to the "solid" tile you are currently over your character will get a strange tendency to float up stairs.

Hope this helps, g'luck
-fel

### #3Anonymous Poster_Anonymous Poster_*  Guests

Posted 29 July 1999 - 03:46 PM

Maybe you want a simple gravity thing.

your character will probably already have some sort of variable storing the X position & the Y position. What it now needs, is a
a velocity variable for the Y axis.

When you update the sprite's position, add the value of the Y velocity (YV) to the Y position. If YV is 0, the sprite isn't rising or falling. If YV < 0, the sprite is
rising, and if YV > 0 the sprite is falling.

If the user presses jump, you just set YV to
a negative value, and the little dude rises.

In order for him to fall back to earth again,
you define another number for gravity, which is smaller (way smaller) than the jump velocity.

Now, just after you add YV to the Y position