Java 2D Platformer Tutorial #8 - Fixing Up the Collision Problems

Check out my new Kotlin tutorial series: • Video Hey guys! In this video we fix up all of the collision bugs. Thanks for watching!

[@rajivnarayan5214]

Wow man I cant stop commenting on your vids. Good job once again despite this being 2+ years ago

[@theYouTubeClipsR]

There is still a bug. I noticed that when you jump near a block and move into it, it teleports the player to the top and messes up the screen. Any fixes?
Ill post my code below.
```
public class Player extends Rectangle {
public static final long serialVerionUID= 1L;
private boolean topCollision = false;
private double moveSpeed = 5;
private double x,y;
private int width,height;
public boolean right = false, left = false, jumping = false, falling = false;
private double jumpSpeed = 15;
private double currentJumpSpeed = jumpSpeed;
private double maxFallSpeed= 5;
private double currentFallSpeed = 0.5;
public Player(int width, int height){
x = GamePanel.WIDTH / 2;
y = GamePanel.WIDTH / 2;
this.width = width;
this.height = height;
}
public void tick(Block[] b){
int iX = (int)x;
int iY = (int)y;
for(int i= 0; i < b.length; i ++) {
// right
if (Collision.playerBlock(new Point(iX + width + (int)GameState.xOffset, iY + (int) GameState.yOffset + 2 ) , b[i])
|| Collision.playerBlock(new Point(iX + width + (int)GameState.xOffset, iY + height + (int)GameState.yOffset - 1), b[i])) {
right = false;
}
//left
if (Collision.playerBlock(new Point(iX + (int)GameState.xOffset - 1, iY + (int) GameState.yOffset + 2) , b[i])
|| Collision.playerBlock(new Point(iX + (int)GameState.xOffset - 1, iY + height + (int)GameState.yOffset - 1), b[i])) {
left = false;
}
//top
if (Collision.playerBlock(new Point(iX + (int)GameState.xOffset+1, iY + (int) GameState.yOffset) , b[i])
|| Collision.playerBlock(new Point(iX + width + (int)GameState.xOffset-1, iY + (int)GameState.yOffset), b[i])) {
jumping = false;
falling = true;
}
//bottom
if (Collision.playerBlock(new Point(iX + (int)GameState.xOffset + 2, iY + height + (int) GameState.yOffset - 1) , b[i])
|| Collision.playerBlock(new Point(iX + width + (int)GameState.xOffset - 1, iY + height + (int)GameState.yOffset+ 1), b[i])) {
y = b[i].getY()- height - GameState.yOffset;
falling = false;
topCollision = true;
}else{
if(!topCollision && !jumping){
falling = true;
}
}
}
topCollision = false;
if(right){
GameState.xOffset+= moveSpeed;
}
if(left){
GameState.xOffset-= moveSpeed ;
}
if(jumping){
GameState.yOffset-=currentJumpSpeed;
currentJumpSpeed -= 1;
}
if(currentJumpSpeed

[@TekkitWizard]

Can u post a place were we can get the src code because i can't figure out this bug i have and i just really want to compare side by side view of mine to yours to see what is wrong. thanks so much---TekkitWizard

[@PatrickFeltes]

Sure, I'll have it up on here: www.github.com/pj6444

[@TekkitWizard]

Thanks so much--TekkitWizard

[@sankeethganeswaran3024]

@@PatrickFeltes it's not there...

[@danielherreragonzalez4311]

can you post the gamepanel class and the main one, finish the tutorial but i cant seem to make to work, also on your page you dont have those 2 clases uploaded :P

[@davidhenricson8699]

Hey! Great tutorial! For how long time have you been programming in Java?

[@PatrickFeltes]

I started about 1.5 years ago during the summer. Once you figure out the basics, you can move onto the more challenging topics like game programming without much difficulty.

[@kozzymoto8994]

My code is exactly like yours but my block still doesn't move on the blocks. I can't figure out what is happening please help!

[@kozzymoto8994]

+KozzyMoto Never mind I just increased the amount added to the offset and it works fine now

[@Frost-cq7sq]

+KozzyMoto Hey i have the same problem did you add to all the offsets?

[@kozzymoto8994]

just to the last two y offsets

[@Frost-cq7sq]

Hey man i have added to the padding just like you did but my player still doesn't move right on the blocks. Should i just add to all the offsets? What should i do?

[@fisherjunior6903]

I realize Im pretty off topic but does anybody know of a good site to stream new tv shows online?

[@jamalconor4225]

@Fisher Junior I watch on Flixzone. You can find it on google =)

[@sageconrad8665]

@Jamal Conor Yea, have been watching on Flixzone for since march myself :)

[@fisherjunior6903]

@Jamal Conor Thank you, signed up and it seems like a nice service =) I really appreciate it!

[@jamalconor4225]

@Fisher Junior you are welcome xD

[@LucaGAFFE]

Make More!

[@PatrickFeltes]

More should be coming this weekend!