绘图cocos2d v3不再有ccDraw *函数，如何绘制而不制作节点？ [英] drawing cocos2d v3 no longer has ccDraw* functions, how do I draw without making nodes?

问题描述

我按照 http://www.cocos2d-swift.org/get-started上的说明操作

，并通过Sprite Builder制作了一个新项目。

and made a new Project through Sprite Builder.

搜索ccDraw不显示任何东西。我在一个论坛上发现了这个例子，并实现了，但它看起来不正确。我不想要一个drawNode来资源税。我想要低级GL绘图线ccDrawLine如何工作。当我做一个这样的drawNode时，它不会重置旧的绘图 - 所以我画的所有行保留在屏幕上。

searching for ccDraw doesn't show anything. I found this example on a forum, and implemented, but it doesn't look right. I don't want a drawNode that taxes resources. I want low level GL drawing line how ccDrawLine used to work. When I do a drawNode like this -- it doesn't reset the old drawing -- so all lines I draw stay on the screen.

如何绘制v2.x？ （ccDrawLine，ccDrawCircle，ccDrawPoly）

How do I draw like in v2.x? (ccDrawLine, ccDrawCircle, ccDrawPoly)

#import "MainScene.h"

@implementation MainScene

- (id)init {
    self = [super init];
    _line01 = [CCDrawNode node];
    [self addChild:_line01];
    [self schedule:@selector(pulse) interval:0.016];
    return self;
}

- (void)draw:(CCRenderer *)renderer transform:(const GLKMatrix4 *)transform {
    [_line01 drawSegmentFrom:ccp(50, 50) to:ccp(x, y) radius:2 color:[CCColor colorWithRed:128 green:25/255 blue:3]];
}

- (void)pulse {
    x+= 1;
    y+= 3;
    if (x > 500) {
        x = 0;
    } else if (y > 500) {
        y = 0;
    }
}

@end

a href =http://www.cocos2d-swift.org/docs/api/Classes/CCDrawNode.html =nofollow> http://www.cocos2d-swift.org/docs/api/Classes/ CCDrawNode.html 建议使用CCDrawNode效率不高。

http://www.cocos2d-swift.org/docs/api/Classes/CCDrawNode.html suggests using a CCDrawNode is not efficient.

推荐答案

只需稍微修改脉冲，如下图所示， draw 覆盖。

simply modify pulse slightly as follows, and get rid of the draw override.

- (void)pulse {
    x+= 1;
    y+= 3;
    if (x > 500) {
        x = 0;
    } else if (y > 500) {
        y = 0;
    }
    // update the line segment
    [_line01 clear];
    [_line01 drawSegmentFrom:ccp(50, 50) to:ccp(x, y) radius:2 color:[CCColor colorWithRed:128 green:25/255 blue:3]];

}

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