ios - How to add one red pixel to the screen

Question

I am using Cocos2d-iphone and want to add one red pixel to the screen. I tried creating an CCSprite but the size should only be one pixel.

I don't want to create an image file.

How to realize it?

Answer 1

在 Swift 中 - 与 Viktor 的答案几乎相同 - 但不是每个像素创建 1 个对象，而是每次调用CCDrawNode时都会绘制同一个对象。CCDrawNodedrawDot

创建 _drawNode 成员变量

var _drawNode : CCDrawNode!

启动 CCDrawNode 对象

_drawNode = CCDrawNode()
self.addChild(_drawNode) // add it to the node you are currently in

// draw the dot, can be recalled anywhere in this class
let touchLocation = ccp(10,10)
_drawNode.drawDot(touchLocation, radius: 1, color: CColor.blackColor())

Answer 2

解决了，CCDrawNode类中有一个方法，可以画一个点：

    CCDrawNode *oneRedPixelA = [[CCDrawNode alloc] init];
    CGPoint positionA = CGPointMake(aLabel.contentSize.width * aLabel.anchorPoint.x, aLabel.contentSize.height * aLabel.anchorPoint.y);
    [oneRedPixelA drawDot:positionA radius:3.0f color:ccc4f(1.0f, 0.0f, 0.0f, 0.5f)];
    [aLabel addChild:oneRedPixelA z:500];