网页版： http://webgl-lesson.wysaid.org/Lesson7/demo_net_html5.html
EGE版 代码
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//By wysaid //blog: http://wysaid.org #define _CRT_SECURE_NO_WARNINGS #include <graphics.h> #include <vector> #include <cmath> using namespace std; struct Point { Point() : x(0), y(0), dx(0), dy(0) {} Point(float vx, float vy) : x(vx), y(vy), dx(0), dy(0) {} float x, y; float dx, dy; }; class Net { public: Net() : m_index(0), m_intensity(0.2f), m_lastIndex(-1) {} ~Net() {} bool initNet(int w, int h) { if(w < 2 || h < 2) return false; m_width = w; m_height = h; m_vec[0].resize(w * h); m_vec[1].resize(w * h); float widthStep = 1.0f / (w - 1); float heightStep = 1.0f / (h - 1); for(int i = 0; i != h; ++i) { const float heightI = i * heightStep; int index = w * i; for(int j = 0; j != w; ++j) { const float widthJ = j * widthStep; m_vec[0][index] = Point(widthJ, heightI); m_vec[1][index] = Point(widthJ, heightI); ++index; } } return true; } void update() { const float widthStep = 1.0f / (m_width - 1.0f); const float heightStep = 1.0f / (m_height - 1.0f); int index = (m_index + 1) % 2; for(int i = 1; i < m_height - 1; ++i) { //const float heightI = i * heightStep; const int k = m_width * i; for(int j = 1; j < m_width - 1; ++j) { const int h = k + j; float dx, dy; dx = (m_vec[m_index][h - 1].x + m_vec[m_index][h + 1].x - m_vec[m_index][h].x * 2.0f); dy = (m_vec[m_index][h - 1].y + m_vec[m_index][h + 1].y - m_vec[m_index][h].y * 2.0f); dx += (m_vec[m_index][h - m_width].x + m_vec[m_index][h + m_width].x - m_vec[m_index][h].x * 2.0f); dy += (m_vec[m_index][h - m_width].y + m_vec[m_index][h + m_width].y - m_vec[m_index][h].y * 2.0f); //模拟能量损失， 当加速度方向与速度方向相反时，加快减速 if(((unsigned&)dx >> 31) != ((unsigned&)m_vec[m_index][h].dx >> 31)) dx *= 1.0f + m_intensity; if(((unsigned&)dy >> 31) != ((unsigned&)m_vec[m_index][h].dy >> 31)) dy *= 1.0f + m_intensity; m_vec[m_index][h].dx += dx * m_intensity; m_vec[m_index][h].dy += dy * m_intensity; m_vec[index][h].dx = m_vec[m_index][h].dx; m_vec[index][h].dy = m_vec[m_index][h].dy; m_vec[index][h].x = m_vec[m_index][h].x + m_vec[index][h].dx; m_vec[index][h].y = m_vec[m_index][h].y + m_vec[index][h].dy; } } m_index = index; } void catchPoint(float x, float y) { int index; if(m_lastIndex < 0) { float mdis = 1e9f; for(int i = 1; i < m_height - 1; ++i) { const int k = m_width * i; for(int j = 1; j < m_width - 1; ++j) { const int h = k + j; const float dis = fabsf(x - m_vec[m_index][h].x) + fabsf(y - m_vec[m_index][h].y); if(dis < mdis) { index = h; mdis = dis; } } } m_lastIndex = index; } else index = m_lastIndex; m_vec[0][index].x = x; m_vec[0][index].y = y; m_vec[1][index].x = x; m_vec[1][index].y = y; m_vec[0][index].dx = 0.0f; m_vec[0][index].dy = 0.0f; m_vec[1][index].dx = 0.0f; m_vec[1][index].dy = 0.0f; } void releasePoint() { m_lastIndex = -1; } void drawNet(float width, float height) { auto &v = m_vec[m_index]; for(int i = 0; i != m_height; ++i) { const int k = i * m_width; for(int j = 1; j != m_width; ++j) { const int h = k + j; ege_line(v[h - 1].x * width, v[h - 1].y * height, v[h].x * width, v[h].y * height); } } for(int i = 0; i != m_width; ++i) { for(int j = 1; j != m_height; ++j) { const int h2 = j * m_width + i; const int h1 = (j - 1) * m_width + i; ege_line(v[h1].x * width, v[h1].y * height, v[h2].x * width, v[h2].y * height); } } } void intensityInc(float f) { m_intensity += f; if(m_intensity > 0.3f) m_intensity = 0.3f; } void intensityDec(float f) { m_intensity -= f; if(m_intensity < 0.001f) m_intensity = 0.001f; } float getIntensity() { return m_intensity; } private: vector<Point> m_vec[2]; int m_index; int m_width, m_height; float m_intensity; int m_lastIndex; }; int main() { initgraph(800, 600, INIT_RENDERMANUAL); setcaption("EGE网格 By wysaid"); Net net; char buffer[1024]; sprintf(buffer, "当前网格强度：%g", net.getIntensity()); net.initNet(80, 60); for(; is_run(); delay_fps(60)) { cleardevice(); if(keystate(key_mouse_l)) { int x, y; mousepos(&x, &y); net.catchPoint(x / 800.0f, y / 600.0f); } else net.releasePoint(); if(kbhit()) { switch(getch()) { case '+': net.intensityInc(0.005f); break; case '-': net.intensityDec(0.005f); break; case 27: exit(0); } flushkey(); sprintf(buffer, "当前网格强度：%g", net.getIntensity()); } setcolor(GREEN); net.drawNet(800, 600); net.update(); setcolor(0x00ff0000); outtextxy(10, 10, "按'+'或者'-'可以增大或者减小网格弹力！这个版本由wysaid制作， 参见: http://blog.wysaid.org"); outtextxy(10, 30, buffer); } closegraph(); return 0; } |
EGE版 github 页面： https://github.com/wysaid/EGE_Net
截图:
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