Distributed.rar

// circle algorithm.cpp : Defines the entry point for the console application. // //This program was updated by Ms Huang Jing in Beijing Normal Unbersity Zhuhai Campus // in Oct 20 in 2012,Contact email: 306744855@qq.com #include "windows.h" #include <GL/glut.h> #include <cmath> #define N 1000 //maximum line numbers int cx = 150, cy = 150, radius = 80, ri = 50, ro = 80, n = 3, samples = 1, flag = 1; int ww, hh; // for display window width and height int line[N][4], k = 0; //for line's endpoint coordinates and line number void Myinit(void); void plotC(int x, int y, int xc, int yc); void Bresenham_Circle_Algorithm(int cx, int cy, int radius); void DrawOneLine(int x1, int y1, int x2, int y2); void NSidedPolygon(int n, int cx, int cy, int radius); void SampleCircle(int inner, int outer, int samples, int cx, int cy); void Keyboard(unsigned char key, int x, int y); void Display(void); void Reshape(int w, int h); void Drawlines(); void myMouse(int button, int state, int x, int y); void myMotion(int x, int y); void main() { char* argv[] = { "hello ", " " }; int argc = 2; // must/should match the number of strings in argv glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutCreateWindow("Basic_Primitive_Algorithm"); Myinit(); //初始设置 glutDisplayFunc(Display); //注册绘制响应回调函数 glutKeyboardFunc(Keyboard); //注册键盘响应回调函数 glutReshapeFunc(Reshape); //注册窗口改变回调函数 glutMouseFunc(myMouse); //注册鼠标按钮回调函数 glutMotionFunc(myMotion); //注册鼠标移动回调函数 glutMainLoop(); } void Myinit(void) { glClearColor(0.0, 0.0, 0.0, 0.0); //背景色 glLineWidth(4.0); //线宽 } void Display(void) { glClear(GL_COLOR_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); //设置矩阵模式为模型变换模式，表示在世界坐标系下 glLoadIdentity(); //将当前矩阵设置为单位矩阵 if (flag == 1) //画圆 Bresenham_Circle_Algorithm(cx, cy, radius); if (flag == 2) //画多边形 NSidedPolygon(n, cx, cy, radius); if (flag == 3) //画胖圆 SampleCircle(ri, radius, samples, cx, cy); if (flag == 4) //鼠标划线 Drawlines(); glutSwapBuffers(); } void Keyboard(unsigned char key, int x, int y) { switch (key) { case 'r': if ((flag == 1) && (radius > 1)) radius--; //画单个圆时半径变小 if ((flag == 3) && (radius > ri)) radius--; //画胖圆时外径变小 break; case 'R': if ((radius < ww / 2) && (radius < hh / 2)) radius++; //半径增加 break; case 'n': if ((flag == 2) && (n > 3)) n--; //多边形边数递减 break; case 'N': if (flag == 2) n++; //多边形边数递增 break; case 'i': if ((flag == 3) && (ri > 1)) ri--; //画胖圆时内径变小 break; case 'I': if ((flag == 3) && (ri < radius)) ri++; //画胖圆时内径变大 break; case 's': if (samples > 1) samples--; //采样数减少 break; case 'S': samples++; //采样数增加 break; case 'a': //cancel antialias glDisable(GL_BLEND); glDisable(GL_LINE_SMOOTH); glDisable(GL_POINT_SMOOTH); glDisable(GL_POLYGON_SMOOTH); break; case 'A': //enable antialias glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glEnable(GL_BLEND); glEnable(GL_POINT_SMOOTH); glHint(GL_POINT_SMOOTH_HINT, GL_NICEST); glEnable(GL_LINE_SMOOTH); glHint(GL_LINE_SMOOTH_HINT, GL_NICEST); glEnable(GL_POLYGON_SMOOTH); break; case '1': flag = 1; //画圆 break; case '2': flag = 2; //画多边形 break; case '3': flag = 3; //画胖圆 //cancel antialias glDisable(GL_BLEND); glDisable(GL_LINE_SMOOTH); glDisable(GL_POINT_SMOOTH); glDisable(GL_POLYGON_SMOOTH); break; case '4': flag = 4; //鼠标划线 for (int i = 0; i <= k; i++) { line[i][0] = 0; line[i][1] = 0; line[i][2] = 0; line[i][3] = 0; } k = 0; break; case 27: exit(0); // default: // return; } glutPostRedisplay(); } void Reshape(int w, int h) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); glViewport(0, 0, w, h); gluOrtho2D(0, w, 0, h); ww = w; hh = h; cx = w / 2; cy = h / 2; } void Bresenham_Circle_Algorithm(int cx, int cy, int radius) { /* YOUR CODE HERE , Update the followling codes with Bresenham_Circle_Algorithm */ glColor3f(1, 1, 1); glTranslatef(cx, cy, 0); glutWireSphere(radius, 40, 40); } void NSidedPolygon(int n, int cx, int cy, int radius) { int x[100], y[100]; double angle; angle = 2 * 3.1415926 / n; glColor3f(1, 1, 1); for (int i = 0; i <= n; i++) { x[i] = (int)(cx + radius * cos(i * angle)); y[i] = (int)(cy + radius * sin(i * angle)); } for (int i = 0; i <= (n - 1); i++) { DrawOneLine(x[i], y[i], x[i + 1], y[i + 1]); } } void DrawOneLine(int xa, int ya, int xb, int yb) { /* YOUR CODE HERE */ //update the following codes with DDA line algorithm glColor3f(1, 1, 1); glBegin(GL_LINES); glVertex2f(xa, ya); glVertex2f(xb, yb); glEnd(); } void Drawlines() { for (int i = 0; i <= k; i++) //******** { DrawOneLine(line[i][0], line[i][1], line[i][2], line[i][3]); } } void SampleCircle(int inner, int outer, int samples, int cx, int cy) { float r2, ro2, ri2; //r2为子像素的半径 int x, y, nx, ny; //x,y 为胖圆内的一点 float color_value; //颜色亮度 int count; //计数合格的子像素 //######### Calculate outer radius's square and inner's square ro2 = outer * outer; //胖圆外径平方 ri2 = inner * inner; //胖圆内径平方 //######### for each pixel(x,y), testing its sample //1/4胖圆内的点测试 for (x = 0; x < outer; x++) for (y = 0; y <= outer; y++) { //######## count available subpixels for each pixel count = 0; //每个点切分成smaples*samples个子像素 //判断子像素是否在胖圆内 for (nx = 0; nx <= samples; nx++) for (ny = 0; ny <= samples; ny++) { r2 = (x + (float)nx / (float)samples) * (x + (float)nx / (float)samples); r2 = r2 + (y + (float)ny / (float)samples) * (y + (float)ny / (float)samples); if ((r2 <= ro2) && (r2 >= ri2)) count++; //计数合格的子像素 } //########## calculate color gray level for each pixel color_value = ((float)count) / (((float)samples + 1.0) * ((float)samples + 1.0)); //########## draw pixel by using the color calculated above glColor3f(color_value, color_value, color_value); //对称画点 glBegin(GL_POINTS); glVertex2f(cx + x, cy + y); glVertex2f(cx + x, cy - y); glVertex2f(cx - x, cy + y); glVertex2f(cx - x, cy - y); glEnd(); } } //鼠标按钮响应事件.. void myMouse(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) { line[k][0] = x; //线段起点x坐标 line[k][1] = hh - y; //线段起点y坐标 } if (button == GLUT_LEFT_BUTTON && state == GLUT_UP) { line[k][2] = x; //线段终点x坐标 line[k][3] = hh - y; //线段终点y坐标 k++; glutPostRedisplay(); } } //鼠标移动时获得鼠标移动中的坐标----------------------------------------------------- void myMotion(int x, int y) { //get the line's motion point line[k][2] = x; //动态终点的x坐标 line[k][3] = hh - y; //动态终点的y坐标 glutPostRedisplay(); }