我需要动态创建这样的轮廓：
不适用于CCSprite,而是适用于在一个CCNode中合并的多个动画CCSprit.我在考虑：
>将CCNode的内容复制到纹理(如AS3中的canvasBitmapData.draw(sourceDisplayObject))
>使用生成的纹理创建CCSprite
>将精灵着色为轮廓颜色并稍微缩放
>将精灵放在节点中的其他精灵后面
我不知道如何执行步骤1.也许在步骤3中在纹理的不透明像素周围绘制“true stroke”而不是色调比例更快？
我完全忘记发布这个问题的答案.这是一个非常平滑的笔画的代码.它并不快,但在第一台iPad上为几个大精灵工作得很好.
我们的想法是在精灵周围画出微小的彩色和模糊的球,并将它们放在自己的纹理上.它既可以用于CCNode,也可以用于CCSprite.该代码还会移动锚点,因为生成的精灵将具有更大的宽度和高度.
得到的轮廓(身体和2只手,在iPad1上约0.3秒)：
白球示例：
> 5f：http://i.stack.imgur.com/e9kos.png
> 10f：http://i.stack.imgur.com/S5goU.png
> 20f：http://i.stack.imgur.com/qk7GL.png
CCNode类别,适用于Cocos2d-iPhone 2.1：
@implementation CCNode (Outline)
- (CCSprite*) outline
{
return [self outlineRect:CGRectMake(0,self.contentSize.width,self.contentSize.height)];
}
- (CCSprite*) outlineRect:(CGRect)rect
{
NSInteger gap = dscale(4);
CGPoint positionShift = ccp(gap - rect.origin.x,gap - rect.origin.y);
CGSize canvasSize = CGSizeMake(rect.size.width + gap * 2,rect.size.height + gap * 2);
CCRenderTexture* renderedSpriteTexture = [self renderTextureFrom:self shiftedFor:positionShift onCanvasSized:canvasSize];
CGSize textureSize = renderedSpriteTexture.sprite.contentSize;
CGSize textureSizeInPixels = renderedSpriteTexture.sprite.texture.contentSizeInPixels;
NSInteger bitsPerComponent = 8;
NSInteger bytesPerPixel = (bitsPerComponent * 4) / 8;
NSInteger bytesPerRow = bytesPerPixel * textureSizeInPixels.width;
NSInteger myDataLength = bytesPerRow * textureSizeInPixels.height;
NSMutableData* buffer = [[NSMutableData alloc] initWithCapacity:myDataLength];
Byte* bytes = (Byte*)[buffer mutableBytes];
[renderedSpriteTexture begin];
glReadPixels(0,textureSizeInPixels.width,textureSizeInPixels.height,GL_RGBA,GL_UNSIGNED_BYTE,bytes);
[renderedSpriteTexture end];
//SEE ATTACHMENT TO GET THE FILES
NSString* spriteFrameName;
if (IS_IPAD) spriteFrameName = (CC_CONTENT_SCALE_FACTOR() == 1) ? @"10f.png" : @"20f.png";
else spriteFrameName = (CC_CONTENT_SCALE_FACTOR() == 1) ? @"5f.png" : @"10f.png";
CCSprite* circle = [CCSprite spriteWithSpriteFrameName:spriteFrameName];
circle.anchorPoint = ccp(0.48,0.48);
float retinaScale = (CC_CONTENT_SCALE_FACTOR() == 1) ? 1.0 : 0.5;
CCRenderTexture* strokeTexture = [CCRenderTexture renderTextureWithWidth:textureSize.width height:textureSize.height pixelFormat:kCCTexture2DPixelFormat_RGBA8888];
[strokeTexture beginWithClear:0 g:0 b:0 a:0];
for (NSInteger x = 0; x < textureSizeInPixels.width; x++)
{
for (NSInteger y = 0; y < textureSizeInPixels.height; y++)
{
NSInteger idx = y * bytesPerRow + x * bytesPerPixel + 3;
NSInteger w = 1;
if (bytes[idx] <= 254)
{
BOOL shouldBeStroked = NO;
for (NSInteger nx = -w; nx <= w; nx++)
{
for (NSInteger ny = -w; ny <= w; ny++)
{
if (x + nx < 0 || y + ny < 0 || x + nx >= textureSizeInPixels.width || y + ny >= textureSizeInPixels.height)
continue;
if (bytes[idx + nx * bytesPerPixel + ny * bytesPerRow] == 255)
{
shouldBeStroked = YES;
break;
}
}
}
if (shouldBeStroked == YES)
{
circle.position = ccp(x * retinaScale,y * retinaScale);
[circle visit];
}
}
}
}
[strokeTexture end];
CCSprite* resultSprite = [CCSprite spriteWithTexture:strokeTexture.sprite.texture];
[resultSprite.texture setAntiAliasTexParameters];
resultSprite.flipY = YES;
if ([self isKindOfClass:[CCSprite class]]) {
CGPoint oldAnchorInPixels = ccp(roundf(self.contentSize.width * self.anchorPoint.x),roundf(self.contentSize.height * self.anchorPoint.y));
resultSprite.anchorPoint = ccp((oldAnchorInPixels.x + gap) / resultSprite.contentSize.width,(oldAnchorInPixels.y + gap) / resultSprite.contentSize.height);
resultSprite.position = self.position;
} else { //CCNode
resultSprite.anchorPoint = CGPointZero;
resultSprite.position = ccpAdd(self.position,ccp(rect.origin.x - gap,rect.origin.y - gap));
}
return resultSprite;
}
- (CCRenderTexture*) renderTextureFrom:(CCNode*)node shiftedFor:(CGPoint)posShift onCanvasSized:(CGSize)size
{
SoftAssertion(!CGSizeEqualToSize(size,CGSizeZero),@"node has zero size");
BOOL isSprite = [node isMemberOfClass:[CCSprite class]];
CGPoint apSave = node.anchorPoint;
CGPoint posSave = node.position;
BOOL wasVisible = node.visible;
CCRenderTexture* rtx = [CCRenderTexture renderTextureWithWidth:size.width
height:size.height
pixelFormat:kCCTexture2DPixelFormat_RGBA8888];
[rtx beginWithClear:0 g:0 b:0 a:0];
node.anchorPoint = CGPointZero;
node.position = posShift;
node.visible = YES;
if (isSprite) [node visit];
else [[self cloneCCNode:node] visit];
node.anchorPoint = apSave;
node.position = posSave;
node.visible = wasVisible;
[rtx end];
return rtx;
}
- (CCNode*) cloneCCNode:(CCNode*)source
{
CCNode* clone = [CCNode node];
void (^copyCCNodeProperties)(CCNode*,CCNode*) = ^(CCNode* source,CCNode* clone)
{
clone.visible = source.visible;
clone.rotation = source.rotation;
clone.position = source.position;
clone.anchorPoint = source.anchorPoint;
clone.zOrder = source.zOrder;
clone.tag = source.tag;
};
for (CCNode* srcSubnode in source.children) {
CCNode* subNode;
if ([srcSubnode isMemberOfClass:[CCSprite class]]) {
CCSprite* srcSprite = (CCSprite*)srcSubnode;
subNode = [CCSprite spriteWithTexture:srcSprite.texture];
CCSprite* subSprite = (CCSprite*)subNode;
subSprite.flipX = srcSprite.flipX;
subSprite.flipY = srcSprite.flipY;
subSprite.displayFrame = srcSprite.displayFrame;
subSprite.opacity = srcSprite.opacity;
}
else if ([srcSubnode isMemberOfClass:[CCLabelTTF class]]) {
CCLabelTTF* srcLabel = (CCLabelTTF*)srcSubnode;
subNode = [CCLabelTTF labelWithString:srcLabel.string fontName:srcLabel.fontName fontSize:srcLabel.fontSize dimensions:srcLabel.dimensions hAlignment:srcLabel.horizontalAlignment vAlignment:srcLabel.verticalAlignment];
CCSprite* subLabel = (CCSprite*)subNode;
subLabel.flipX = srcLabel.flipX;
subLabel.flipY = srcLabel.flipY;
subLabel.color = srcLabel.color;
}
else {
subNode = [self cloneCCNode:srcSubnode];
}
copyCCNodeProperties(srcSubnode,subNode);
[clone addChild:subNode];
}
copyCCNodeProperties(source,clone);
return clone;
}
