[OpenGL] Computer Graphics experiment 02: polygon world

/*************************************** ********************************* // * Test02: polygon world/* Author: Wang Haiyang/* Date: 2012/11/20/* Email: wanghaiyang@139.me /************************************** * ********************************/# define max_polygons 8 # define max_vertices 10 # define editrange 30 # include <Gl/glut. h> # include <stdlib. h> # include <iostream> # include <fstream> # include <iostream> # include <String> using namespace STD; void mymouse (INT, Int, Int, INT); void mymotion (INT, INT); void mydisplay (); void myreshape (INT, INT ); void color_menu (INT); void main_menu (INT); int pick_polygon (int x, int y); void myinit (); // define the struct type typedef struct polygon {int color; // color index bool used; // returns true int xmin, xmax, ymin, and Ymax if the polygon has been defined; // enclose the box float XC, YC; // The Center int nvertices of the polygon; // The number of vertices int X [max_vertices]; // Vertex int y [max_vertices]; // vertex} polygon; // define the flag variable bool picking = false; // whether it is in the picking status bool moving = false; // whether the polygon is in the moving state int in_polygon =-1; // int present_color = 0 inside any polygon; // The default color int polygoncount = 0; // record the total number of polygon glfloat temparrayx [max_vertices] = {0}; glfloat temparrayy [max_vertices] = {0}; int tempcount = 0; // The number of temporary points of the currently drawn polygon bool tempdrawing = false; // determine whether the current polygon is being drawn glsizei wh = 500; // initialize the window size glsizei WW = 500; // initialization window size int draw_mode = 0; // drawing mode bool editpointing = false; // whether to edit the vertex glfloat colors [8] [3] ={{ 0.0, 0.0, 0.0 },{ 1.0, 0.0, 0.0 },{ 0.0, 1.0, 0.0 },{ 0.0, 0.0, 1.0 },{ 0.0, 1.0, 1.0 },{ 1.0, 0.0, 1.0 },{ 1.0, 1.0, 0.0}, {1.0, 1.0, 1.0 }}; polygon polygons [max_polygons]; void myreshape (int w, int h) {glmatrixmode (gl_projection); glloadidentity (); gluortho2d (0.0, (gldouble) W, 0. 0, (gldouble) H); glmatrixmode (gl_modelview); glloadidentity (); glviewport (0, 0, W, H); ww = W; Wh = H ;} void myinit () {glclearcolor (0.1, 0.1, 0.5, 1.0); // set the clear screen color to blue-blue for (INT I = 0; I <max_polygons; I ++) {polygons [I]. used = false; // mark all polygon as undefined} void mymouse (int btn, int state, int X, int y) {Y = wh-y; // Add the vertex if (BTN = maid & State = fig &&! Picking &&! Moving & tempdrawing) {moving = false; picking = false; cout <"added a vertex! "<Endl; cout <" in_polygon: "<in_polygon <Endl; If (polygons [in_polygon]. nvertices = max_vertices) {cout <"Maximum number of vertices exceeded" <Endl;} else {temparrayx [tempcount] = x; temparrayy [tempcount] = y; tempcount ++; glupostredisplay ();} If (in_polygon> = 0) {If (polygons [in_polygon]. nvertices = max_vertices) {cout <"exceeds the maximum number of vertices" <Endl;} else {int I = polygons [in_polygon]. nvertices; polygons [in_polygon]. X [I] = X; cout <"added a vertex! Polygons [in_polygon]. X [I]: "<polygons [in_polygon]. X [I] <Endl; polygons [in_polygon]. Y [I] = y; cout <"added a vertex! Polygons [in_polygon]. Y [I]: "<polygons [in_polygon]. Y [I] <Endl; polygons [in_polygon]. nvertices ++ }}} if (BTN = maid & State = maid & Picking &&! Moving) {moving = false; picking = false; Int J = pick_polygon (x, y); If (j> = 0) {polygons [J]. used = false; polygoncount --; in_polygon =-1; fig () ;}} int pick_polygon (int x, int y) {for (INT I = max_polygons; i> = 0; I --) {cout <"polygons [I]. used = "<polygons [I]. used <Endl; If (polygons [I]. used) {If (x> = polygons [I]. xmin) & (x <= polygons [I]. xmax) & (Y> = polygons [I]. ymin )&& (Y <= polygons [I]. ymax) {in_polygon = I; moving = true; return I ;}}cout <"not inside the polygon" <Endl; Return-1 ;} void mymotion (int x, int y) {float dx, Dy; y = wh-y; int I, j; If (editpointing) {for (INT I = 0; I <max_polygons; ++ I) {If (polygons [I]. used) {for (Int J = 0; j <polygons [I]. nvertices; ++ J) {If (x <polygons [I]. X [J] + editrange & x> polygons [I]. X [J]-editrange & Y <polygons [I]. Y [J] + editra Nge & Y> polygons [I]. Y [J]-editrange) {polygons [I]. X [J] = x; polygons [I]. Y [J] = y ;}}} glupostredisplay () ;}if (tempdrawing) {temparrayx [tempCount-1] = x; temparrayy [tempCount-1] = y; glupostredisplay ();} if (moving) {J = pick_polygon (x, y); If (j <0) {cout <"not inside the polygon" <Endl; return ;} DX = x-polygons [J]. XC; DY = Y-polygons [J]. YC; for (I = 0; I <polygons [J]. nvertices; I ++) {polygons [J]. X [I] + = DX; polygons [J]. Y [I] + = Dy;} polygons [J]. XC + = DX; polygons [J]. YC + = Dy; polygons [J]. xmax + = DX; polygons [J]. xmin + = DX; polygons [J]. ymax + = Dy; polygons [J]. ymin + = Dy; glupostredisplay () ;}} void color_menu (INT index) {present_color = index; If (in_polygon> = 0) {polygons [in_polygon]. color = index ;}} void main_menu (INT index) {int I = 0; Switch (INDEX) {Case 1: // create a new polygon {tempdrawing = True; tempcount = 0; moving = false; picking = false; editpointing = false; moving = false; for (I = 0; I <max_polygons; I ++) {If (polygons [I]. used = false) {break;} if (I = max_polygons) {cout <"has reached the maximum value \ n" <Endl; exit (0 );} cout <"I =" <I <Endl; polygons [I]. color = present_color; polygons [I]. used = true; polygons [I]. nvertices = 0; in_polygon = I; picking = false; break;} case 2: // define the ending polygon and calculate the bounding box of the polygon and its center position tempdrawing = false; tempcount = 0; moving = false; picking = false; editpointing = false; if (in_polygon> = 0) {polygons [in_polygon]. xmax = polygons [in_polygon]. xmin = polygons [in_polygon]. X [0]; polygons [in_polygon]. ymax = polygons [in_polygon]. ymin = polygons [in_polygon]. Y [0]; polygons [in_polygon]. XC = polygons [in_polygon]. X [0]; polygons [in_polygon]. YC = polygons [in _ Polygon]. Y [0]; for (INT I = 1; I <polygons [in_polygon]. nvertices; I ++) {If (polygons [in_polygon]. X [I] <polygons [in_polygon]. xmin) {polygons [in_polygon]. xmin = polygons [in_polygon]. X [I];} else if (polygons [in_polygon]. X [I]> polygons [in_polygon]. xmax) {polygons [in_polygon]. xmax = polygons [in_polygon]. X [I];} If (polygons [in_polygon]. Y [I] <polygons [in_polygon]. ymin) {polygons [in_polygon]. ym In = polygons [in_polygon]. Y [I];} else if (polygons [in_polygon]. Y [I]> polygons [in_polygon]. ymax) {polygons [in_polygon]. ymax = polygons [in_polygon]. Y [I];} polygons [in_polygon]. XC + = polygons [in_polygon]. X [I]; polygons [in_polygon]. YC ++ = polygons [in_polygon]. Y [I]; cout <"polygons [in_polygon]. X "<I <": "<polygons [in_polygon]. X [I] <Endl; cout <"polygons [in_polygon]. Y "<I <": "<polygons [in_polygon]. Y [I] <Endl;} polygons [in_polygon]. XC = polygons [in_polygon]. XC/polygons [in_polygon]. nvertices; polygons [in_polygon]. YC = polygons [in_polygon]. YC/polygons [in_polygon]. nvertices;} in_polygon =-1; polygoncount ++; glupostredisplay (); break; Case 3: // sets the picking mode tempdrawing = false; tempcount = 0; moving = false; picking = true; editpointing = false; break; Case 4: // whether to move tempdrawing = false; tempcou Nt = 0; moving = true; picking = false; editpointing = false; break; Case 5: // storage file {tempdrawing = false; tempcount = 0; moving = false; picking = false; editpointing = false; in_polygon =-1; STD: ofstream file ("polygon. dat ", STD: IOS: ate | STD: IOS: Binary); If (! File) {STD: cout <"file opening failed! "; Abort (); // equivalent to exit} // write the file for (INT I = 0; I <max_polygons; I ++) {cout <"polygons [" <I <"]. used "<polygons [I]. used <Endl; If (polygons [I]. used) {cout <"I wrote one !! "<Endl; file. write (char *) & polygons [I], sizeof (polygons [I]); cout <"& polygons [I], sizeof (polygons [I]) "<& polygons [I] <" size "<sizeof (polygons [I]) <Endl ;}// close the file. close (); break;} case 6: // read the file {in_polygon =-1; tempdrawing = false; tempcount = 0; moving = false; picking = false; editpointing = false; STD: ifstream rfile ("polygon. dat ", STD: IOS: Binary); // open the file // STD: ofstream file (" polygon. da T ", STD: IOS: ate | STD: IOS: Binary); If (! Rfile) {STD: cout <"file opening failed! "; Return; // equivalent to exit} // read the file for (INT I = 0; I <max_polygons; I ++) {cout <"polygons [" <I <"]. used "<polygons [I]. used <Endl; rfile. read (char *) & polygons [I], sizeof (polygons [I]); cout <"polygons [" <I <"]. used "<polygons [I]. used <Endl;} glupostredisplay (); // close the file rfile. close (); break;} case 7: in_polygon =-1; tempdrawing = false; tempcount = 0; moving = false; picking = false; editpointing = true; brea K ;}} void mydisplay () {cout <"mydisplay! "<Endl; glclear (gl_color_buffer_bit); For (INT I = 0; I <max_polygons; ++ I) {If (polygons [I]. Used & (I! = In_polygon | moving) {cout <"polygons [I]. used = "<polygons [I]. used <Endl; glcolor3fv (colors [polygons [I]. color]); cout <colors [polygons [I]. color] <Endl; glbegin (gl_polygon); For (Int J = 0; j <polygons [I]. nvertices; ++ J) {glvertex2i (polygons [I]. X [J], polygons [I]. Y [J]); cout <"X:" <polygons [I]. X [J] <"Y:" <polygons [I]. Y [J] <Endl;} glend () ;}if (tempdrawing) {glcolor3fv (colors [present_color]); glbegin (gl_line_strip); For (Int J = 0; j <tempcount; ++ J) {glvertex2f (temparrayx [J], temparrayy [J]);} glend ();} glflush ();} int main (INT argc, char ** argv) {int c_menu; gluinit (& argc, argv); gluinitdisplaymode (glu_single | glu_rgb); gluinitwindowposition (400,100); gluinitwindowsize (500,500 ); valley createwindow ("polygon test"); fig (mydisplay); myinit (); c_menu = fig (color_menu); fig ("black", 0); fig ("red ", 1); maid ("green", 2); maid ("blue", 3); maid ("blue", 4); maid ("Purple", 5 ); glumaddmenuentry ("yellow", 6); glumaddmenuentry ("white", 7); glumcreatemenu (main_menu); glumaddmenuentry ("", 1); glumaddmenuentry ", 2); maid ("delete", 3); maid ("move", 4); maid ("Archive Local file", 5 ); // The options for storing the Quadrilateral data to a local file ("read local file", 6); gluaddmenuentry ("Edit vertex", 7); gluaddsubmenu ("color ", c_menu); cout <"c_menu =" <c_menu <Endl; gluattachmenu (FIG); glureshapefunc (myreshape); glumousefunc (mymouse); glumotionfunc (mymotion ); glumainloop ();}