cocos2d(CCSprite繫結不規則剛體與精靈一起移動)
阿新 • • 發佈：2019-01-11
對於不規則的精靈我們可以藉助PhysicsEditor來製作shape ，
對於地圖可以使用Tiled軟體製作瓷磚地圖。
今天主要記錄一下如何把CCSprite與不規則剛體進行繫結，然後一起移動
//初始化玩家
1.載入shape檔案，在init方法中新增：
//載入shape檔案
[[GB2ShapeCache sharedShapeCache] addShapesWithFile:@"physicShape.plist"];<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <!-- created with http://www.physicseditor.de --> <plist version="1.0"> <dict> <key>metadata</key> <dict> <key>format</key> <integer>1</integer> <key>ptm_ratio</key> <real>32</real> </dict> <key>bodies</key> <dict> <key>Player1</key> <dict> <key>anchorpoint</key> <string>{ 0.0000,0.0000 }</string> <key>fixtures</key> <array> <dict> <key>density</key> <real>2</real> <key>friction</key> <real>0</real> <key>restitution</key> <real>0</real> <key>filter_categoryBits</key> <integer>1</integer> <key>filter_groupIndex</key> <integer>0</integer> <key>filter_maskBits</key> <integer>65535</integer> <key>isSensor</key> <false/> <key>id</key> <string></string> <key>fixture_type</key> <string>POLYGON</string> <key>polygons</key> <array> <array> <string>{ 1.000,0.000 }</string> <string>{ 32.000,0.000 }</string> <string>{ 27.000,32.000 }</string> <string>{ 7.000,32.000 }</string> </array> </array> </dict> </array> </dict> <key>RetroCoin</key> <dict> <key>anchorpoint</key> <string>{ 0.0000,0.0000 }</string> <key>fixtures</key> <array> <dict> <key>density</key> <real>2</real> <key>friction</key> <real>0</real> <key>restitution</key> <real>0</real> <key>filter_categoryBits</key> <integer>1</integer> <key>filter_groupIndex</key> <integer>0</integer> <key>filter_maskBits</key> <integer>65535</integer> <key>isSensor</key> <false/> <key>id</key> <string></string> <key>fixture_type</key> <string>POLYGON</string> <key>polygons</key> <array> <array> <string>{ 4.000,3.000 }</string> <string>{ 17.000,0.000 }</string> <string>{ 28.000,3.000 }</string> <string>{ 28.000,28.000 }</string> <string>{ 16.000,32.000 }</string> <string>{ 4.000,28.000 }</string> </array> </array> </dict> </array> </dict> </dict> </dict> </plist>
2.初始化精靈和剛體及夾具
#pragma mark 初始化玩家 -(void)initPlayer{ //建立物件層 獲得物件的產生點 CCTMXObjectGroup *objects=[_gameMap objectGroupNamed:@"objects"]; NSMutableDictionary *spawnPoint=[objects objectNamed:@"StartPoint"]; //獲得出生點座標 float x=[[spawnPoint valueForKey:@"x"] floatValue]; float y=[[spawnPoint valueForKey:@"y"] floatValue]; _player=[CCSprite spriteWithFile:@"Player1.png"]; _player.position=ccp(x,y); _player.anchorPoint=CGPointZero; //設定描點為0，0 否則與剛體不能重合 b2BodyDef playerBodyDef; //定義剛體結構體的定義 [self addChild:_player]; playerBodyDef.type=b2_dynamicBody; playerBodyDef.fixedRotation=true; //不會旋轉 playerBodyDef.position.Set(x/PTM_RATIO, y/PTM_RATIO); _playBody=world->CreateBody(&playerBodyDef); _playBody->SetUserData(_player); [[GB2ShapeCache sharedShapeCache] addFixturesToBody:_playBody forShapeName:@"Player1"]; //為剛體設定夾具 }
3.在update函式中新增更新位置方法
for(b2Body *b = world->GetBodyList(); b; b=b->GetNext()) { if (b->GetUserData() != NULL) { CCSprite *sprite = (CCSprite *)b->GetUserData(); //獲得精靈物件 if (sprite != nil) { b2Vec2 bodyPos = b->GetPosition(); //獲得剛體的位置 CGPoint pos = CGPointMake(bodyPos.x * PTM_RATIO, bodyPos.y * PTM_RATIO); //變換為座標 float32 rotation = -1 * CC_RADIANS_TO_DEGREES(b->GetAngle()); sprite.position = pos; sprite.rotation = rotation; } } }
效果圖：
