好吧,我们开始吧。我有一个 cocos2d 应用程序,并且有向玩家移动的目标。当玩家移动时,我希望他们再次缓慢地将目的地转向玩家,这样他们就不会只是进入空旷的空间。是否可以更改精灵 mid-runAction 的目的地?
编辑:
这是 - (void)changeTargetDest 中的代码
- (void)changeTargetDest {
NSMutableArray* deleteArray = [[NSMutableArray alloc] init];
for(CCSprite* s in _targets) {
float offX = s.position.x - player.position.x;
float offY = s.position.y - player.position.y;
float adjustX;
float adjustY;
float offDistance = sqrt(powf(offX, 2.0f) + powf(offY, 2.0f));
if(offDistance < 15) {
[deleteArray addObject:s];
deaths++;
[deathLabel setString:[NSString stringWithFormat:@"Deaths: %ld", deaths]];
if(deaths == 0)
[kdLabel setString:[NSString stringWithFormat:@"K/D ratio: %ld.00", score]];
else
[kdLabel setString:[NSString stringWithFormat:@"K/D ratio: %.2f", ((float)score / (float)deaths)]];
}
else {
adjustX = offX * .99;
adjustY = offY * .99;
CGPoint point = CGPointMake(player.position.x + adjustX, player.position.y + adjustY);
[s setPosition:point];
}//else
}//for
for (CCSprite *target in deleteArray) {
[_targets removeObject:target];
[self removeChild:target cleanup:YES];
}
}
这很好用,除了一个问题。因为新位置的计算方法只是取前一个偏移量的 0.99,所以目标离玩家越近,它移动的越慢。我怎样才能使它的速度恒定?