使openGL线连接 [英] Make openGL lines connected

问题描述

现在我创建了一个多边形，然后我做同样的事情，但用line_loop来绘制轮廓。我的问题现在是如果我设置线的厚度为高，线不连接。

感谢

pre> glMatrixMode（GL_PROJECTION）;
glLoadIdentity（）;
glOrtho（0，600，600，0，0，1）;
glMatrixMode（GL_MODELVIEW）;
......
glLineWidth（5.0）;
glTranslatef（250,250,0）;
glRotated（x，0,050.0）;
glBegin（GL_POLYGON）; //开始四边形坐标
//梯形
glColor3f（255,0,0）;
glVertex2f（0,0）;
glVertex2f（100,0）;
glVertex2f（100,100）;
glVertex2f（50,50）;
glVertex2f（0,100）;

glEnd（）; //结束四边形坐标

glBegin（GL_LINE_LOOP）; //开始四边形坐标

//梯形
glColor3f（0,255,0）;
glVertex2f（0,0）;
glVertex2f（100,0）;
glVertex2f（100,100）;
glVertex2f（50,50）;
glVertex2f（0,100）;

glEnd（）; //结束四边形坐标


解决方案

http://answers.oreilly.com/topic/949-how-to-work-around-the-iphones-anti-aliasing-limitations/ =nofollow>此处显示如何实现四舍五入线帽和抗锯齿线使用纹理技巧。

Right now I'v created a polygon, then I do the same thing but with line_loop to draw the outline. My issue right now is if I set the line thickness to high, the lines arn't connected. Their ends would need to be (linewidth) longer... is there a way to fix this?

Thanks

glMatrixMode (GL_PROJECTION);
        glLoadIdentity ();
        glOrtho (0, 600, 600, 0, 0, 1);
        glMatrixMode (GL_MODELVIEW);
......
glLineWidth(5.0);
glTranslatef(250,250,0);
glRotated(x,0,0,50.0);
    glBegin(GL_POLYGON); //Begin quadrilateral coordinates
    //Trapezoid
    glColor3f(255,0,0);
glVertex2f(0,0);
glVertex2f(100,0);
glVertex2f(100,100);
glVertex2f(50,50);
glVertex2f(0,100);

    glEnd(); //End quadrilateral coordinates

    glBegin(GL_LINE_LOOP); //Begin quadrilateral coordinates

    //Trapezoid
    glColor3f(0,255,0);
    glVertex2f(0,0);
    glVertex2f(100,0);
    glVertex2f(100,100);
    glVertex2f(50,50);
    glVertex2f(0,100);

    glEnd(); //End quadrilateral coordinates

解决方案

The article here shows how to achieve rounded line caps and antialised lines using a texture trick.

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