问题描述

如何在 Cocos2D 框架中绘制填充多边形?

How can I draw filled poly in Cocos2D framework?

下面的代码绘制多边形但没有抗锯齿.我应该改变什么?

Code below draws poly but without antialiasing.What should I change?

void ccFillPoly( CGPoint *poli, int points, BOOL closePolygon )
{
    // Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
    // Needed states: GL_VERTEX_ARRAY,
    // Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY
    glDisable(GL_TEXTURE_2D);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);

    glVertexPointer(2, GL_FLOAT, 0, poli);
    if( closePolygon )
        //   glDrawArrays(GL_LINE_LOOP, 0, points);
        glDrawArrays(GL_TRIANGLE_FAN, 0, points);
    else
        glDrawArrays(GL_LINE_STRIP, 0, points);

    // restore default state
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glEnable(GL_TEXTURE_2D);
}

推荐答案

模拟抗锯齿的一个好方法是在多边形周围添加透明顶点.这种方法快速且美观，但实施起来并不难.这里是抗锯齿线的解决方案.

One good approach to emulate antialiasing is to add transparent vertices around your polygon. This method is fast and fine-looking, but is little hard to implement. Here is solution for antialiased lines.

如果您不担心性能，您可以多次渲染多边形，并具有一定的透明度并偏移 1 个像素.这适用于没有纹理的多边形.

If you don't worry about performance, you may render the polygon multiple times with some transparency and offset by 1 pixel. This would work for not textured polygons.

这篇关于填充抗锯齿聚 cocos2d的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！