Cocos2dを使用してスプライトをドラッグし、スプライトが選択されている場合は境界線を追加しようとしています。白い背景を表示することはできますが、境界線が特に難しいことがわかります。私はこのコードを持っています:
if(self.selectedSprite)
self.selectedSprite = nil;
CCLayerColor *selectedLayer = [[CCLayerColor alloc] init];
// CCSprite *backgroundSprite = [CCSprite spriteWithFile:@"white_1x1.gif" rect:CGRectMake(2,2,self.boundingBox.size.width-4,self.boundingBox.size.height-4)];
CCSprite *backgroundSprite = [CCSprite spriteWithFile:@"white_1x1.gif" rect:CGRectMake(0,0,self.boundingBox.size.width,self.boundingBox.size.height)];
[backgroundSprite setContentSize:CGSizeMake(self.contentSize.width-4, self.contentSize.height-4)];
backgroundSprite.anchorPoint = ccp(0,0);
CCRenderTexture* rt = [CCRenderTexture renderTextureWithWidth:backgroundSprite.texture.contentSize.width + 2 height:backgroundSprite.texture.contentSize.height+2];
[backgroundSprite setFlipY:YES];
[backgroundSprite setColor:ccc3(0,0,0)];
ccBlendFunc originalBlendFunc = [backgroundSprite blendFunc];
[backgroundSprite setBlendFunc:(ccBlendFunc) { GL_SRC_ALPHA, GL_ONE }];
CGPoint bottomLeft = ccp(backgroundSprite.texture.contentSize.width * backgroundSprite.anchorPoint.x + 1, backgroundSprite.texture.contentSize.height * backgroundSprite.anchorPoint.y + 1);
CGPoint position = ccpSub([backgroundSprite position], ccp(-backgroundSprite.contentSize.width / 2.0f, -backgroundSprite.contentSize.height / 2.0f));
[rt begin];
for (int i=0; i<360; i++) // you should optimize that for your needs
{
[backgroundSprite setPosition:ccp(bottomLeft.x + sin(CC_DEGREES_TO_RADIANS(i))*1, bottomLeft.y + cos(CC_DEGREES_TO_RADIANS(i))*1)];
[backgroundSprite visit];
}
[backgroundSprite setPosition:bottomLeft];
[backgroundSprite setBlendFunc:originalBlendFunc];
[backgroundSprite setColor:ccc3(255,255,255)];
[backgroundSprite visit];
[rt end];
[rt setPosition:position];
[selectedLayer addChild:rt];
[selectedLayer addChild:backgroundSprite];
self.selectedSprite = selectedLayer;
いろいろな呪文を試しましたが、境界線が見えないようです。レイヤー上の他のすべての背面に白で塗りつぶされた長方形の黒い境界線が必要です。