如何在cocos2dx中绘制任意曲线

Question

我正在开发基于cocos2dx的游戏，现在我需要在手指在屏幕上移动时绘制一条任意曲线，然后该曲线将成为英雄行走的路径。任何想法都会受到赞赏。

Answer 1

Curve is connected line.
so you can draw curve using connected line.

Accumulate the points in cctouchesmove/cctouchemove event function.
Make line sprite, add and draw them.

and also cocos2d-x have curve classes. if you use them, you can run action easily.

CCCardinalSplineTo
CCCardinalSplineBy
CCCatmullRomTo
CCCatmullRomBy
CCBezierBy
CCBezierTo

And for drawing, this is sample code.

void HelloWorld::draw()  
{  
    // move to 50,50 since the "by" path will start at 50,50  
    kmGLPushMatrix();
    kmGLTranslatef(50, 50, 0);
    ccDrawCardinalSpline(m_pArray, 7, 100);

    kmGLPopMatrix();

    CCSize s = CCDirector::sharedDirector()->getWinSize();  

    kmGLPushMatrix();  
    kmGLTranslatef(s.width/2, 50, 0);  
    ccDrawCardinalSpline(m_pArray, 1, 100);  
    kmGLPopMatrix();  
}