Databases
StackOverflow2013
Postsdbo
POjava slick2D simulate gravity for jumping
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POjava slick2D simulate gravity for jumping
    primarykey
    data
    text
    <p>So I made a little game in java with slick2D, but I want my character to jump. Now I have this: </p> <pre><code>if (container.getInput().isKeyPressed(Input.KEY_UP) &amp;&amp; !jumping) { verticalSpeed = -1.0f * delta;//negative value indicates an upward movement jumping = true; } if (jumping) { verticalSpeed += .007f * delta;//change this value to alter gravity strength } playerY += verticalSpeed; playerPoly.setY(playerY); </code></pre> <p>Well that makes my sprite jump and fall down...for ever. So how can you make it stop from falling when it hits the ground? I tried this: </p> <pre><code>if (entityCollisionWith()){ jumping = false; } </code></pre> <p>But it doesn't work :(</p> <p>my code with jumping:</p> <pre><code>import org.newdawn.slick.Animation; import org.newdawn.slick.AppGameContainer; import org.newdawn.slick.BasicGame; import org.newdawn.slick.GameContainer; import org.newdawn.slick.Graphics; import org.newdawn.slick.Image; import org.newdawn.slick.Input; import org.newdawn.slick.SlickException; import org.newdawn.slick.SpriteSheet; import org.newdawn.slick.geom.Polygon; import org.newdawn.slick.tiled.TiledMap; public class Game extends BasicGame { public BlockMap map; Image player = null; float playerX = 320; float playerY = 288; float scale = 1f; private Polygon playerPoly; boolean jumping = false; float verticalSpeed = 0.0f; public Game() { super("my game"); } public void init(GameContainer container) throws SlickException { map = new BlockMap("data/Map01.TMX"); player = new Image("data/rightSprite.png"); playerPoly = new Polygon(new float[]{ playerX,playerY, playerX+17,playerY, playerX+17,playerY+48, playerX,playerY+48 }); } public void update(GameContainer container, int delta) throws SlickException { if (container.getInput().isKeyDown(Input.KEY_LEFT)) { playerX-=0.15; playerPoly.setX(playerX); if (entityCollisionWith()){ playerX+=0.15; playerPoly.setX(playerX); } } if (container.getInput().isKeyDown(Input.KEY_RIGHT)) { playerX+=0.15; playerPoly.setX(playerX); if (entityCollisionWith()){ playerX-=0.15; playerPoly.setX(playerX); } } if (container.getInput().isKeyPressed(Input.KEY_UP) &amp;&amp; !jumping) { verticalSpeed = -1.0f * delta;//negative value indicates an upward movement jumping = true; } if (entityCollisionWith()){ jumping = false; verticalSpeed = -1.1f; verticalSpeed = 0; } if (jumping) { verticalSpeed += .01f * delta;//change this value to alter gravity strength } playerY += verticalSpeed; playerPoly.setY(playerY); if (entityCollisionWith()){ jumping = false; verticalSpeed = 0; } } public boolean entityCollisionWith() throws SlickException { for (int i = 0; i &lt; BlockMap.entities.size(); i++) { Block entity1 = (Block) BlockMap.entities.get(i); if (playerPoly.intersects(entity1.poly)) { return true; } } return false; } public void render(GameContainer container, Graphics g) { BlockMap.tmap.render(0, 0); player.draw(playerX, playerY, scale); g.draw(playerPoly); } public static void main(String[] argv) throws SlickException { AppGameContainer container = new AppGameContainer(new Game(), 640, 480, false); container.start(); } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USJan Vos
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload