我目前正在使用 Objective-C 开发 Cocos2D Mac 游戏。
我的运动正常,但我还有一个问题..
我使用这段代码来移动我的播放器,它是一只苍蝇,所以它需要在各个方向上自由移动。
键盘事件:
- (void)ccKeyDown:(NSEvent*)keyDownEvent
{
// Get pressed key (code)
NSString * character = [keyDownEvent characters];
unichar keyCode = [character characterAtIndex: 0];
// Player movement
if (keyCode == 119) {
playerMoveUp = TRUE;
} else if (keyCode == 115) {
playerMoveDown = TRUE;
}
if (keyCode == 100) {
playerMoveLeft = TRUE;
} else if (keyCode == 97) {
playerMoveRight = TRUE;
}
}
- (void)ccKeyUp:(NSEvent*)keyUpEvent
{
// Get pressed key (code)
NSString * character = [keyUpEvent characters];
unichar keyCode = [character characterAtIndex: 0];
// Player movement
if (keyCode == 119) {
playerMoveUp = FALSE;
} else if (keyCode == 115) {
playerMoveDown = FALSE;
}
if (keyCode == 100) {
playerMoveLeft = FALSE;
} else if (keyCode == 97) {
playerMoveRight = FALSE;
}
}
游戏时间循环:
-(void) tick: (ccTime) dt
{
// Get player current position
NSInteger playerPositionX = player.position.x;
NSInteger playerPositionY = player.position.y;
// Player movement
if (playerMoveUp == TRUE) {
player.position = ccp(playerPositionX, playerPositionY + 1);
}
if (playerMoveDown == TRUE) {
player.position = ccp(playerPositionX, playerPositionY - 1);
}
if (playerMoveLeft == TRUE) {
player.position = ccp(playerPositionX + 1, playerPositionY);
}
if (playerMoveRight == TRUE) {
player.position = ccp(playerPositionX - 1, playerPositionY);
}
}
我的问题是当我的播放器向左移动时,不可能同时添加向上键,因此播放器将向左和向上移动。实现这一目标的最佳方法是什么?