屏保:画线圈LineFlower

LineFlowerSP

小时候玩过一种画线圈的玩具,将一个圆形齿轮在一个大圈里转,会画出各种图形来.这个程序就是模仿它做的.算法原理:将一个圆围绕着另一个大圆公转,并且它还做自转运动.那么圆内一点的运动轨迹就能生成一个奇妙的图形.更奇妙的是,一个小小参数的改变,会使整个画面完全不同.
      程序启动后,会随机生成不同的图形,点击鼠标或按下键盘任意按键会自动退出.使用鼠标滚轮滚动进行图形切换.我的博客头像就是用这个软件生成的.

下载地址:

http://files.cnblogs.com/WhyEngine/LineFlower%E5%B1%8F%E4%BF%9D.zip

图形生成算法代码:

 void        CLineFlowerSPEntity::Reset()

 {

     m_nFinishTime = ;

     m_nVerticesNum = ;

     m_nPlayVertices = ;

     UINT width;

     UINT height;

     m_pDX9Render->GetBackBufferSize(width, height);

     Vector2 vScreenCenter(width*0.5f, height*0.5f);

     Yreal screenCircleRadius = width < height ? width*0.5f : height*0.5f;

     if (screenCircleRadius < 10.0f)

     {

         return;

     }

     Yreal rotateCircleRadius = yf_rand_real(screenCircleRadius - 128.0f);

     Yreal fixCircleRadius = screenCircleRadius - rotateCircleRadius;

     Yreal offset = yf_rand_real(64.0f, screenCircleRadius - 10.0f);

     if (yf_rand_bool())

     {

         offset = -offset;

     }

     Yreal stepScale0 = yf_rand_real(0.1f, 1.0f);

     if (yf_rand_bool())

     {

         stepScale0 = 1.0f / stepScale0;

     }

     Yreal stepScale180 = yf_rand_real(0.1f, 1.0f);

     if (yf_rand_bool())

     {

         stepScale180 = 1.0f / stepScale180;

     }

     Yreal offsetScale0 = yf_rand_real(0.1f, 1.0f);

     if (yf_rand_bool())

     {

         offsetScale0 = 1.0f / offsetScale0;

     }

     Yreal offsetScale180 = yf_rand_real(0.1f, 1.0f);

     if (yf_rand_bool())

     {

         offsetScale180 = 1.0f / offsetScale180;

     }

     Yreal maxOffset = (offsetScale180 > offsetScale0) ? offsetScale180 : offsetScale0;

     maxOffset *= fabs(offset);

     Yreal posScale = screenCircleRadius / (fixCircleRadius + maxOffset);

     posScale *= 0.95f;

     Yreal scale0 = yf_rand_real(0.1f, 1.0f);

     if (yf_rand_bool())

     {

         scale0 = 1.0f / scale0;

     }

     Yreal scale180 = yf_rand_real(0.1f, 1.0f);

     if (yf_rand_bool())

     {

         scale180 = 1.0f / scale0;

     }

     Yreal step = screenCircleRadius / rotateCircleRadius;

     if (step > 360.0f)

     {

         return;

     }

     m_nCirclesCount = YD_MAX_CIRCLES_COUNT;

     m_nVerticesNum = m_nCirclesCount * ;

     Vector2 vCenter;

     Yreal degree = ;

     Vector2 vPos;

     Vector2 vPos0;

     Vector2 vPos1;

     Yuint index;

     Yreal r, a;

     Yreal scale;

     RhwVertex* vb;

     m_pVB->Lock(, , (void**)&vb, );

     for (Yuint i = ; i < m_nCirclesCount; i++)

     {

         for (Yuint j = ; j < ; j++)

         {

             vCenter.x = vScreenCenter.x + fixCircleRadius*m_listSinValues[j];

             vCenter.y = vScreenCenter.y + fixCircleRadius*m_listCosValues[j];

             r = fabsf(degree - 180.0f) / 180.0f;

             scale = yf_lerp(offsetScale0, offsetScale180, r);

             index = (Yint)degree;

             vPos0.x = vCenter.x - offset*scale*m_listSinValues[index];

             vPos0.y = vCenter.y - offset*scale*m_listCosValues[index];

             vPos1.x = vCenter.x - offset*scale*m_listSinValues[index + ];

             vPos1.y = vCenter.y - offset*scale*m_listCosValues[index + ];

             a = degree - index;

             vPos = vPos0*(1.0f - a) + vPos1*a;

             vPos.x = posScale*(vScreenCenter.x - vPos.x) + vScreenCenter.x;

             vPos.y = posScale*(vScreenCenter.y - vPos.y) + vScreenCenter.y;

             vb[i* + j].Set(vPos.x, vPos.y, 0.0f, 1.0f);

             scale = yf_lerp(stepScale0, stepScale180, r);

             degree += step*scale;

             degree = fmodf(degree, 360.0f);

         }

         if (degree < YD_DEGREE_MAX_ERROR || degree > 360.0f - YD_DEGREE_MAX_ERROR)

         {

             m_nCirclesCount = i + ;

             m_nVerticesNum = m_nCirclesCount * ;

             vb[m_nVerticesNum] = vb[];

             m_nVerticesNum++;

             break;

         }

     }

     m_pVB->Unlock();

 }

屏保设置方式
XP:
将目录下的所有文件拷贝到WINDOWS系统目录下如"C:\WINDOWS\system32"
在设置屏保的对话框中,选择"LineFlowerSP"

WIN7,WIN8
将目录下的所有文件拷贝到"C:\WINDOWS\SysWOW64"或"C:\WINDOWS\SysWOW32"目录下
在设置屏保的对话框中,选择"LineFlowerSP"