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Making a platform game.

by Greg Charles Eckermann · in Torque Game Builder · 03/18/2007 (11:51 pm) · 4 replies

Whoever made the Mini Platform tutorial, its a great tutorial BTW. I posted this before but no one answered, so I might as well make a topic about it. Anyhow I'm using the code to prototype a Castlevania cone. Where the mid air movements cannot be controlled. The Mini Platform tutorial works great as a prototype except when I add a function to limit the jump movements. If I take out the if (!%airborne) it will work with no bugs. But I don't want the player to control his/her movements while in mid-air. But when I add it, it doe's not work all the time and in a second the character's position will freeze at a random time.

Here's may changes on the Mini Platform tutorial.


function playerJump()
{
if(!$pGuy.airborne)
{
$pGuy.setLinearVelocityY(-80);
$pGuy.airborne = true;
$pGuy.jump = true;
}
}
function playerClass::jump(%this)
{
if(%this.moveLeft)
{
%this.jumpd=1;
}

if(%this.moveRight)
{
%this.jumpd=2;
}

if(!%this.moveLeft && !%this.moveRight)
{
%this.jumpd=3;
}
}

function playerClass::updateHorizontal(%this)
{
if(%this.jumpd==1)
{
%this.setLinearVelocityX(-30);
}

if(%this.jumpd==2)
{
%this.setLinearVelocityX(30);
}

if(%this.jumpd==3)
{
%this.setLinearVelocityX(0);
}
}
function playerClass::updateVertical(%this)
{
%yVelocity = %this.getLinearVelocityY();

if(%this.airborne)
{
%this.setLinearVelocityY(0);
%collision = %this.castCollision(0.005);

if(%collision !$= "")
%this.setLinearVelocityX(0);
}

%this.setLinearVelocityY(50);
%collision = %this.castCollision(0.005);


if(%collision $= "")
{
%this.airborne = true;
%this.setConstantForceY(50);
if(!%this.jump){
%this.jumpd=3;
}
}
else if(%yVelocity < 0 && %this.airborne)
{
%this.setConstantForceY(50);
}
else
{
if(%yVelocity > 0)
{
%this.airborne = false;
%this.jump = false;
%this.setConstantForceY(0);
}
}

%this.setLinearVelocityY(%yVelocity);
}

function playerClass::updateMovement(%this)
{
%this.jump();
%this.updateHorizontal();
%this.updateVertical();
%this.setCurrentAnimation();
debuger.text = %this.jumpd;
}

Should I rewrite it all from scratch, or is there a way to fix this?
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Torque Owner Kevin James
#1
03/19/2007 (9:39 am)
I would try making the playerJump function a method of playerClass.

Torque Owner Greg Charles Eckermann
#2
03/19/2007 (2:48 pm)
I don't know how to exactly do that. but I did do this
function playerClass::onLevelLoaded(%this, %scenegraph)
{
     $pGuy = %this;
      moveMap.bindCmd(keyboard, "left", "playerLeft();", "playerLeftStop();");
      moveMap.bindCmd(keyboard, "right", "playerRight();", "playerRightStop();");
      moveMap.bindCmd(keyboard, "space", "playerJump();", "");
	 %force = 20;
     sceneWindow2D.mount($pGuy, "0 0", %force, true);
	 %this.setCollisionMaxIterations(2);

}
function playerLeft()
{
	
    $pGuy.moveLeft = true;
}

function playerLeftStop()
{
    $pGuy.moveLeft = false;
}

function playerRight()
{
     $pGuy.moveRight = true;
}

function playerRightStop()
{
     $pGuy.moveRight = false;
}

function playerJump()
{
		  $pGuy.jump = true;
}
function playerClass::jump(%this)
{

	 if(!%this.airborne)
     {
     if(%this.moveLeft)
     {
          %this.jumpd=1;
     }

     if(%this.moveRight)
     {
         %this.jumpd=2;
     }

     if(!%this.moveLeft && !%this.moveRight)
     {
         %this.jumpd=3;
     }
	if (%this.jump)
	{
          %this.setLinearVelocityY(-80);
          %this.airborne = true;	
	}
}
}
function playerClass::updateHorizontal(%this)
{
     if(%this.jumpd==1)
     {
          %this.setLinearVelocityX(-30);
     }

     if(%this.jumpd==2)
     {
          %this.setLinearVelocityX(30);
     }

     if(%this.jumpd==3)
     {
          %this.setLinearVelocityX(0);
     }
}
function playerClass::updateVertical(%this)
{
     %yVelocity = %this.getLinearVelocityY();

     if(%this.airborne)
     {
          %this.setLinearVelocityY(0);
          %collision = %this.castCollision(0.005);

          if(%collision !$= "")
               %this.setLinearVelocityX(0);
     }

     %this.setLinearVelocityY(50);
     %collision = %this.castCollision(0.005);
		

     if(%collision $= "")
     {
          %this.airborne = true;
          %this.setConstantForceY(50);
		if(!%this.jump){
		%this.jumpd=3;
		}
     }
     else if(%yVelocity < 0 && %this.airborne)
     {
          %this.setConstantForceY(50);
     }
     else 
     {
		if(%yVelocity > 0)
			{
          %this.airborne = false;
		  %this.jump = false;
          %this.setConstantForceY(0);
			}
     }

     %this.setLinearVelocityY(%yVelocity);
} 

function playerClass::setCurrentAnimation(%this)
{
     %xVelocity = %this.getLinearVelocityX();
     %yVelocity = %this.getLinearVelocityY();

     if(%xVelocity > 0)
     {
          %this.setFlip(false, false);
     }
     else if(%xVelocity < 0)
     {
          %this.setFlip(true, false);
     }
	     if(%this.airborne)
     {
          if(%yVelocity < 0)
          {
               %this.playAnimation(playerJumpUp);
          }	
          else
          {
               %this.playAnimation(playerJumpDown);
          }
     }
     else
     {
		if(%xVelocity == 0)
          {
               %this.playAnimation(playerStand);
          }
          else
          {
               if(%this.getAnimationName() $= "playerRun")
               {
                    if(%this.getIsAnimationFinished())
                    {
                         %this.playAnimation(playerRun);
                    }
               }
               else
               {
                    %this.playAnimation(playerRun);
               }
          }

     }

}


function playerClass::updateMovement(%this)
{
	 %this.jump();
     %this.updateHorizontal();
	 %this.updateVertical();
     %this.setCurrentAnimation();
	 debuger.text = %this.jumpd;
}

function PlatformerSceneGraph::onUpdateScene()
{
     if (isObject($pGuy))
          $pGuy.updateMovement();
}

Torque Owner Kevin James
#3
03/19/2007 (3:02 pm)
Does it work now?

If not, here is an example method based on your playerLeft() function
function playerClass::playerLeft(%this)
{

%this.moveLeft = true;
%this.jump();
}

example usage:
$pGuy.playerLeft;

Now you can have multiple players without the variables getting confused. Also, I wouldn't have a property and method with the same name as you do (e.g. jump).

Torque Owner Greg Charles Eckermann
#4
03/19/2007 (4:08 pm)
It still has issues I think I'm going to code from scratch on this. Basicly doing my own scripting on this. But thanks awayway. I'm going to create a new platform tutorial on this, maybe do a diffrent way of gravity and collisions.