OpenGL 画出雷达动态扫描效果(二) 非底图

OpenGL 画出雷达动态扫描效果(一)中给出了已一张图片作为底图的雷达扫面程序

如果有漂亮的雷达底图的话，效果应该非常不错的，另外也可以直接手绘雷达框架

效果如下

雷达主体代码

    glLineWidth(2.0);
    glColor4f(0.0f, 1.0f, 0.0f,1.0f);
    DrawCircle(1);
    DrawCircle(0.4);    
    glBegin(GL_LINES);
    glVertex2f(-1,0),glVertex2f(1,0);
    glVertex2f(0,-1),glVertex2f(0,1);
    glVertex2f(-0.7,-0.1),glVertex2f(-0.7,0.1);
    glVertex2f(0.7,-0.1),glVertex2f(0.7,0.1);
    glVertex2f(-0.1,-0.7),glVertex2f(0.1,-0.7);
    glVertex2f(-0.1,0.7),glVertex2f(0.1,0.7);
    glEnd();

画圆代码

    glEnable(GL_LINE_SMOOTH);
    glHint(GL_LINE_SMOOTH_HINT,GL_NICEST);            
    glBegin(GL_LINE_LOOP);
    for(int i=0;i<200;++i)
        glVertex2f(r*cos(2*Pi/200*i),r*sin(2*Pi/200*i));
    glEnd();

扫描线代码

    float pos_x=0;
    float pos_y=0;
    glBegin(GL_TRIANGLE_FAN);
    glColor4f(0.0f, 0.0f, 0.0f,0.1f);
    glVertex2f(0.0f, 0.0f);        
    for(int i=0;i<ScanWidth;++i)
    { 
        pos_x=cos((i/180.0)*Pi+ScanTheta);
        pos_y=sin((i/180.0)*Pi+ScanTheta);
        glColor4f(0.0f, (i+0.01)/ScanWidth, 0.0f,1.0f);
        glVertex2f(pos_x, pos_y); 
    }
    glEnd();

Demo下载地址: http://files.cnblogs.com/files/xd-jinjian/file.rar