Cocos2d iPhone-精灵剪辑/面具/框架

最后我用了一把剪刀。

在MainSprite中,我建议:

- (void) visit
{
    if (!self.visible) {
        return;
    }
    glEnable(GL_SCISSOR_TEST);
    glScissor(x, y, width, height);   
    [super visit];
    glDisable(GL_SCISSOR_TEST);
}

这将剪裁或遮罩指定区域。

唯一棘手的是,在横向模式下,Cocos2D在屏幕的左下角有0,0,而OpenGL在右下角有0,0,因为它不考虑屏幕的方向。

换言之,对于OpenGL,请考虑您有一个旋转的纵向屏幕。

我写了一个ClippingNode类就是这样做的。您可以将其他节点(精灵、标签等)添加到ClippingNode,它们将仅在ClippingNode指定的区域中绘制。它还考虑了设备的旋转。

在内部,它使用了像巴赫的答案一样的GL\u剪刀测试。

http://www.learn-cocos2d.com/2011/01/cocos2d-gem-clippingnode/

够我穿的了。

注释掉glPushMatrix和glPopMatrix调用。。

要使用,只需设置position和contentSize属性,并将要剪裁的子对象添加到此ClippingNode实例。contentSize属性用于定义剪裁区域的尺寸。

example of usage:
ClippingNode *clipNode = [[ClippingNode alloc] init];
clipNode.anchorPoint = ccp(0.5f, 0);
clipNode.position = ccp(100, 25);
clipNode.contentSize = CGSizeMake(120, 120);

// add clipNode to your node hierarchy.
[parentNode addChild:clipNode];

// add one or more children to your clipNode:
[clipNode addChild:child1];

// ClippingNode.h
// CC0 - (public domain. Use in anyway you see fit.)
// No warranty of any kind is expressed or implied.
//
// by UChin Kim.
//
// the caller can simply set the regular cocos2d
// properties: position and contentSize to define the clipping region implicitly (i.e. the
// position and contentSize of the ClippingNode is the clipping region to be used).
// as an added bonus, position seems to work as expected (relative to parent node, instead of
// requiring absolute positioning).
//
// also, anchorPoint and scale properties seem to work as expected as well..
// no special code is neeed to handle device orientation changes correctly..
//
// To visually see exactly what is being clipped, set the following #define
// #define SHOW_CLIPPED_REGION_IN_LIGHT_RED 1
//

#import "cocos2d.h"

@interface ClippingNode : CCNode

@end

//
// ClippingNode.m
//
#import "ClippingNode.h"

@implementation ClippingNode

-(void) visit
{
CGPoint worldOrg = [self convertToWorldSpace:ccp(0, 0)];
CGPoint dest = [self convertToWorldSpace:ccp(self.contentSize.width, self.contentSize.height)];
CGPoint dims = ccpSub(dest, worldOrg);

glPushMatrix();
glEnable(GL_SCISSOR_TEST);

glScissor(worldOrg.x, worldOrg.y, dims.x, dims.y);

#if SHOW_CLIPPED_REGION_IN_LIGHT_RED
glColor4ub(64, 0, 0, 128);
ccDrawSolidRect(ccp(0, 0), ccp(1024, 1024));
#endif

[super visit];

glDisable(GL_SCISSOR_TEST);
glPopMatrix();
}

@end