cocos2d-iphone - 如何在 CCLabelTTF 上创建笔画

Question

在过去的几个小时里，我一直在寻找一种在 cocos2d 中围绕标签创建笔划的方法，但到目前为止，我想出的只是：CCLabelTTF Font Stroke Demo这正是我所需要的，但笔划看起来很块状，我需要看起来更平滑的东西。有没有办法为笔画打开某种抗锯齿，或者可能有其他方法来创建笔画。任何帮助，将不胜感激。

Answer 1

To create a stroke:

-(CCRenderTexture*) createStroke: (CCLabelTTF*) label   size:(float)size   color:(ccColor3B)cor
{
    CCRenderTexture* rt = [CCRenderTexture renderTextureWithWidth:label.texture.contentSize.width+size*2  height:label.texture.contentSize.height+size*2];
    CGPoint originalPos = [label position];
    ccColor3B originalColor = [label color];
    BOOL originalVisibility = [label visible];
    [label setColor:cor];
    [label setVisible:YES];
    ccBlendFunc originalBlend = [label blendFunc];
    [label setBlendFunc:(ccBlendFunc) { GL_SRC_ALPHA, GL_ONE }];
    CGPoint bottomLeft = ccp(label.texture.contentSize.width * label.anchorPoint.x + size, label.texture.contentSize.height * label.anchorPoint.y + size);
    //CGPoint positionOffset = ccp(label.texture.contentSize.width * label.anchorPoint.x - label.texture.contentSize.width/2,label.texture.contentSize.height * label.anchorPoint.y - label.texture.contentSize.height/2);
    //use this for adding stoke to its self...
    CGPoint positionOffset= ccp(-label.contentSize.width/2,-label.contentSize.height/2);

    CGPoint position = ccpSub(originalPos, positionOffset);

    [rt begin];
    for (int i=0; i<360; i+=60) // you should optimize that for your needs
    {
        [label setPosition:ccp(bottomLeft.x + sin(CC_DEGREES_TO_RADIANS(i))*size, bottomLeft.y + cos(CC_DEGREES_TO_RADIANS(i))*size)];
        [label visit];
    }
    [rt end];
    [[[rt sprite] texture] setAntiAliasTexParameters];//THIS
    [label setPosition:originalPos];
    [label setColor:originalColor];
    [label setBlendFunc:originalBlend];
    [label setVisible:originalVisibility];
    [rt setPosition:position];
    return rt;
}

Usage:

CCRenderTexture* myStroke = [self createStroke:myCCLabelTTF size:myStrokeSize color:ccYELLOW];
[myCCLabelTTF addChild:myStroke z:-1 tag:kTagStroke];

And to increase smoothness, modify the following function to fit your needs (decrease the +60 increment to perhaps +30). Just note that the more iterations, the more more time spent rendering, which will negatively affect performance:

for (int i=0; i<360; i+=60) // you should optimize that for your needs
    {
        [label setPosition:ccp(bottomLeft.x + sin(CC_DEGREES_TO_RADIANS(i))*size, bottomLeft.y + cos(CC_DEGREES_TO_RADIANS(i))*size)];
        [label visit];
    }