COCOS2D API 之 CompositionAction

Actions: Composition

There are some actions that let you compose actions.

• Sequence action
• Spawn action
• Repeat action
• RepeatForever action

Sequence

The CCSequence action is a list of actions. The actions are executed in the order that they are defined.

Example:

id action1 = [CCMoveTo actionWithDuration:2 position:ccp(100,100)];
id action2 = [CCMoveBy actionWithDuration:2  position: ccp(80,80)];
id action3 = [CCMoveBy actionWithDuration:2  position: ccp(0,80)];
[sprite runAction: [CCSequence actions:action1, action2, action3, nil]];

The action1 will be executed first. When action1 finishes, then action2 will be executed. And whenaction2 finishes, only then action3 will be executed.

*IMPORTANT:* The inner actions should have a non-infinite time (e.g.: You can't add a CCRepeatForeveraction in a CCSequence action).

Spawn

The CCSpawn action lets you run several actions at the same time. The duration of the CCSpawn action will be the duration of the longest sub-action.

id action = [CCSpawn actions:
		[CCJumpBy actionWithDuration:2 position:ccp(300,0) height:50 jumps:4],
		[CCRotateBy actionWithDuration: 2 angle: 720],
		nil];
 
[sprite runAction:action];

Repeat

The CCRepeat action lets you repeat an action a limited number of times. Example:

id a1 = [CCMoveBy actionWithDuration:1 position:ccp(150,0)];
id action1 = [CCRepeat actionWithAction:
		[CCSequence actions: [CCPlace actionWithPosition:ccp(60,60)], a1, nil]
		times:3];
[sprite runAction:action1];

RepeatForever

The CCRepeatForever action is a special action. Since it will repeat an action forever, its duration can't be measured.

Example:

id a1 = [CCMoveBy actionWithDuration:1 position:ccp(150,0)];
id action2 = [CCRepeatForever actionWithAction:
		[CCSequence actions: [[a1 copy] autorelease], [a1 reverse], nil]
	];
[sprite runAction:action2];

*IMPORTANT*: CCRepeatForever is not a valid CCIntervalAction. You can't use a CCRepeatForeverinside a CCSequence action.