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:

1 void CLineFlowerSPEntity::Reset()  2 {  3     m_nFinishTime = 0;  4     m_nVerticesNum = 0;  5     m_nPlayVertices = 2;  6
7  UINT width;  8  UINT height;  9     m_pDX9Render->GetBackBufferSize(width, height);  10
11     Vector2 vScreenCenter(width*0.5f, height*0.5f);  12
13     Yreal screenCircleRadius = width < height ? width*0.5f : height*0.5f;  14     if (screenCircleRadius < 10.0f)  15  {  16         return;  17  }  18
19     Yreal rotateCircleRadius = yf_rand_real(screenCircleRadius - 128.0f);  20     Yreal fixCircleRadius = screenCircleRadius - rotateCircleRadius;  21     Yreal offset = yf_rand_real(64.0f, screenCircleRadius - 10.0f);  22     if (yf_rand_bool())  23  {  24         offset = -offset;  25  }  26
27     Yreal stepScale0 = yf_rand_real(0.1f, 1.0f);  28     if (yf_rand_bool())  29  {  30         stepScale0 = 1.0f / stepScale0;  31  }  32     Yreal stepScale180 = yf_rand_real(0.1f, 1.0f);  33     if (yf_rand_bool())  34  {  35         stepScale180 = 1.0f / stepScale180;  36  }  37
38     Yreal offsetScale0 = yf_rand_real(0.1f, 1.0f);  39     if (yf_rand_bool())  40  {  41         offsetScale0 = 1.0f / offsetScale0;  42  }  43     Yreal offsetScale180 = yf_rand_real(0.1f, 1.0f);  44     if (yf_rand_bool())  45  {  46         offsetScale180 = 1.0f / offsetScale180;  47  }  48
49     Yreal maxOffset = (offsetScale180 > offsetScale0) ? offsetScale180 : offsetScale0;  50     maxOffset *= fabs(offset);  51     Yreal posScale = screenCircleRadius / (fixCircleRadius + maxOffset);  52     posScale *= 0.95f;  53
54     Yreal scale0 = yf_rand_real(0.1f, 1.0f);  55     if (yf_rand_bool())  56  {  57         scale0 = 1.0f / scale0;  58  }  59     Yreal scale180 = yf_rand_real(0.1f, 1.0f);  60     if (yf_rand_bool())  61  {  62         scale180 = 1.0f / scale0;  63  }  64
65     Yreal step = screenCircleRadius / rotateCircleRadius;  66     if (step > 360.0f)  67  {  68         return;  69  }  70
71     m_nCirclesCount = YD_MAX_CIRCLES_COUNT;  72     m_nVerticesNum = m_nCirclesCount * 360;  73
74  Vector2 vCenter;  75     Yreal degree = 0;  76
77  Vector2 vPos;  78  Vector2 vPos0;  79  Vector2 vPos1;  80  Yuint index;  81  Yreal r, a;  82  Yreal scale;  83
84     RhwVertex* vb;  85     m_pVB->Lock(0, 0, (void**)&vb, 0);  86
87     for (Yuint i = 0; i < m_nCirclesCount; i++)  88  {  89         for (Yuint j = 0; j < 360; j++)  90  {  91             vCenter.x = vScreenCenter.x + fixCircleRadius*m_listSinValues[j];  92             vCenter.y = vScreenCenter.y + fixCircleRadius*m_listCosValues[j];  93
94             r = fabsf(degree - 180.0f) / 180.0f;  95             scale = yf_lerp(offsetScale0, offsetScale180, r);  96
97             index = (Yint)degree;  98             vPos0.x = vCenter.x - offset*scale*m_listSinValues[index];  99             vPos0.y = vCenter.y - offset*scale*m_listCosValues[index]; 100
101             vPos1.x = vCenter.x - offset*scale*m_listSinValues[index + 1]; 102             vPos1.y = vCenter.y - offset*scale*m_listCosValues[index + 1]; 103
104             a = degree - index; 105             vPos = vPos0*(1.0f - a) + vPos1*a; 106             vPos.x = posScale*(vScreenCenter.x - vPos.x) + vScreenCenter.x; 107             vPos.y = posScale*(vScreenCenter.y - vPos.y) + vScreenCenter.y; 108
109             vb[i*360 + j].Set(vPos.x, vPos.y, 0.0f, 1.0f); 110
111             scale = yf_lerp(stepScale0, stepScale180, r); 112             degree += step*scale; 113             degree = fmodf(degree, 360.0f); 114  } 115
116         if (degree < YD_DEGREE_MAX_ERROR || degree > 360.0f - YD_DEGREE_MAX_ERROR) 117  { 118             m_nCirclesCount = i + 1; 119             m_nVerticesNum = m_nCirclesCount * 360; 120             vb[m_nVerticesNum] = vb[0]; 121             m_nVerticesNum++; 122             break; 123  } 124  } 125
126     m_pVB->Unlock(); 127 }

View Code

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"