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This page is a Work In Progress.

Contents 1 Setting up a Tile Map 2 Setting up Collisions 3 Setting up a Trigger

[edit] Setting up a Tile Map This is the function I use to load up the game arena. Put this in ./arena.cs. function createArena(%width, %height) { %arena = new t2dTileMap() { scenegraph = t2dscene; }; %arena.loadTileMap("~/data/tileMaps/arena1.tile"); %layer = %arena.getTileLayer(0); %layer.setCollisionActive(false, true); %layer.setGraphGroup($arenaGroup); %layer.setLayer($arenaLayer); // Hardcoded values not very good, this will // be change in later versions. %layer.setTileSize("2 2"); %layer.setPosition("49 37"); }

[edit] Setting up Collisions This is a simple version of the onCollision function. This function should be located in ./game.cs. function t2dSceneObject::onCollision(%srcObj, %dstObj, %srcRef, %dstRef, %time, %normal, %contactCount, %contacts) { switch ( %srcObj.getGraphGroup() ) { case $ballGroup: // the ball hits something switch ( %dstObj.getGraphGroup() ) { case $paddleGroup: // the ball hit the paddle error("Hit Paddle..."); %scoreModifier = 10; updateScore(%scoreModifier); case $arenaGroup: // the ball hit the arena wall error("Hit Arena wall..."); case $triggerGroup: // the ball hit a trigger. I used a trigger for the area behind the paddle. killBall(%srcObj); case $ballGroup: // the ball hit another ball error("Hit another Ball..."); } checkVelocity(%srcObj); // this function is to ensure a minimum speed and angle. } }

[edit] Setting up a Trigger As with most of the code in this tutorial, I found this in another tutorial on TDN. The following code should be placed in a new file called trigger.cs, and should be placed in the gamescripts directory. This will be used to create a trigger to determine when the ball passes beyond the paddle and out of bounds. The actual trigger is created in the createArena() function in the file arena.cs. new SimGroup(TriggerCheckGroup); function createTrigger(%pos, %size, %enter, %stay, %leave) { %trigger = new t2dSceneObject() { scenegraph = t2dscene; }; %trigger.setPosition(%pos); %trigger.setSize(%size); %trigger.setLayer($triggerLayer); %trigger.setGraphGroup($triggerGroup); %trigger.setCollisionMasks(BIT($ballGroup), BIT($ballLayer)); %trigger.setCollisionActive(true, true); %trigger.enterAction = %enter; %trigger.stayAction = %stay; %trigger.leaveAction = %leave; //%trigger.setDebugOn(BIT(0)); } function collidePlayerTrigger(%trigger) { TriggerCheckGroup.add(%trigger); %trigger.inNow = true; } function checkTrigger(%trigger) { if (!%trigger.inPrev && %trigger.inNow) schedule(0, 0, "eval", %trigger.enterAction); else if (%trigger.inPrev && %trigger.inNow) schedule(0, 0, "eval", %trigger.stayAction); else if (%trigger.inPrev && !%trigger.inNow) { schedule(0, 0, "eval", %trigger.leaveAction); TriggerCheckGroup.remove(%trigger); } %trigger.inPrev = %trigger.inNow; %trigger.inNow = false; }

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