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* This is your template code for a simple maze "game". The player's task




#define NODEBUG;/*;* This is your template code for a simple maze "game". The player's task;* is to drag an arrow through the maze from the red starting dot to touch;* the Blue middle square without touching the black maze walls on the way.;* The game starts when you drag across the red starting dot. The arrow you;* are dragging is red if you have not yet touched the starting dot or if;* you've already won or lost. It turns blue to show when the game is;* running and to indicate that your job is to get to the blue square.;* If you touch the maze walls or release your button press (this is;* to prevent cheating by skipping over walls) the arrow becomes red;* to show that you have lost the game and need to start again.;* Its NOT as easy as it seems especially if you have a laptop trackpad!!!;*;* By the way, the maze came from...;*;* I added the blue square and red starting dot, and made the background;* greeen. The resulting ppm image files that you need are;* or a much easier one called;*;*;* Your assignment of course is to fill out this template to reimplement;* some of the things that are removed from my working version. These;* are marked in the code at the comment positions "XXX Your code here;* The particular tasks are;* 1. test the RGB image value corresponding to the current mouse position;* 2. compute the estimated direction of current motion;* 3. "manually" rotate and position the arrow in the direction of motion;* 4. print some additional text on the screen to count redraw cycles;* 5. design a new arrow shape and make it work properly;* 6. fix the game ending with something to better distinguish a win;* 7. EXTRA CREDIT - any other SIGNIFICANT improvement of your own design;*;* The specific aims of these tasks is to 1) reinforce your understanding;* of what an image is and how its laid out in memory. 2+3) refresh your;* understanding of elementary trig which will be very important later;* 4) show you how to position and print bitmap text 5) understand 2D;* shapes and their manipulation 6+7) exercise your creativity;* Before you change anything the program should already successfully;* show the maze image but not do anything except handle the ESCape key.;*;* Please email your completed solution code to me before the next class.;*/;#include;#include;#include;#include;#ifdef __APPLE;#include;#else;#include;#endif;#ifndef M_PI // Microsoft forgot to put this in their math.h !;#define M_PI 3.14159265358979;#endif;void init(int argc, char **argv);void init_glut(int argc, char **argv);void init_gl(int argc, char **argv);void reshape(int w, int h);void display(void);void keyboard(unsigned char key, int x, int y);void mouse_buttons(int button, int state, int mousex, int mousey);void mouse_motion(int mousex, int mousey);int arrowx = 0, arrowy = 0;float arrow_lastx = 0, arrow_lasty = 0, // floats to do a lagged average;int gamerunning;int ppm_wid, ppm_ht, ppm_range;unsigned char *pixels;int main(int argc, char **argv);init(argc, argv);init_glut(argc, argv);init_gl(argc, argv);glutReportErrors();glutMainLoop();return(0);// initialize, in this case, means read the maze image file;// WARNING: this does not handle PPM header comments and other variations!!!;void init(int argc, char **argv);FILE *fp;char tmptext[100], *fname = "easymaze.ppm;if(!(fp = fopen(fname, "rb"))) { // open binary file for read;fprintf(stderr, "ERROR: can't open %sn", fname);fname = "tinymaze.ppm;if(!(fp = fopen(fname, "rb")));fprintf(stderr, "ERROR: can't open %sn", fname);exit(1);fscanf (fp, "%[^n] ", tmptext);fprintf(stderr, "file magic string n", tmptext);if(strcmp(tmptext, "P6"));fprintf(stderr, "Sorry: this only does P6 == PPMn");exit(1);fscanf (fp, "%d%d", &ppm_wid, &&ppm_ht);fprintf(stderr, "ppm image size %d X by %d Yn", ppm_wid, ppm_ht);fscanf(fp, "%dn", &&ppm_range);if(ppm_range != 255);fprintf(stderr, "Sorry: range %d is not allowedn", ppm_range);exit(1);pixels = (unsigned char *)malloc(ppm_ht*ppm_wid*3);if(!pixels);fprintf(stderr, "malloc failed on image size %d %dn;ppm_ht, ppm_wid);exit(1);fread(pixels, 1, ppm_ht*ppm_wid*3, fp);fclose(fp);void init_glut(int argc, char **argv);glutInit(&&argc, argv);glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);glutInitWindowPosition(300, 200), // a reasonable screen XY???;glutInitWindowSize(ppm_wid, ppm_ht), // window size same as image;//glutFullScreen(), // if you want to experiment;glutCreateWindow("Assignment 02");glutDisplayFunc(display), // this does the 1st drawing;glutReshapeFunc(reshape);glutMouseFunc(mouse_buttons), // this catches mouse buttons;glutMotionFunc(mouse_motion), // this works even if no button pressed;glutKeyboardFunc(keyboard);void init_gl(int argc, char **argv);glClearColor(1, 1, 1, 1);glDisable(GL_DEPTH_TEST);glDisable(GL_LIGHTING);glEnable(GL_COLOR_MATERIAL);void reshape(int w, int h);glViewport(0, 0, w, h);glMatrixMode(GL_PROJECTION);glLoadIdentity();glOrtho(0, ppm_wid, 0, ppm_ht, 1, 100);glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);void keyboard(unsigned char key, int x, int y);switch(key);case 27: // escape key;exit(0);break;default;fprintf(stderr, "unknown key %d at %d %dn", key, x, y);glutPostRedisplay();void draw_string(float x, float y, char *s);glColor3f(0.0, 0.0, 0.0);glRasterPos2f(x, y), // place left baseline text start position;while(*s);glutBitmapCharacter(GLUT_BITMAP_9_BY_15, *s++);int mouse_saved_button, mouse_saved_state, // useful in mouse_motion();void mouse_buttons(int button, int state, int mousex, int mousey);mouse_saved_button = button;mouse_saved_state = state;switch(button);case GLUT_LEFT_BUTTON;if(state == GLUT_DOWN);//fprintf(stderr, "just pressed %d %dn", mousex, mousey), // help debug;if(state == GLUT_UP);if(gamerunning == 1) { // may change this for debug;fprintf(stderr, "No button lifting!!!n");gamerunning = -1, // Don't cheat!!!;glutPostRedisplay();//fprintf(stderr, "just released %d %dn", mousex, mousey), // help debug;break;void mouse_motion(int mousex, int mousey);int R, G, B;unsigned char *p;switch(mouse_saved_button);case GLUT_LEFT_BUTTON;//fprintf(stderr, "%f %f %d %d %d %dn;//arrow_lastx, arrow_lasty, arrowx, arrowy, mousex, mousey);arrow_lastx = 0.7 * arrow_lastx + 0.3 * arrowx;arrow_lasty = 0.7 * arrow_lasty + 0.3 * arrowy;arrowx = mousex;arrowy = mousey;if(mouse_saved_state == GLUT_DOWN);// 1) XXX Your code retrieve the RGB of cursor pixel.;// First make the pointer p point to the R value;// for the current pixel inside the pixels array.;// Then successively retrive the R, G, B values.;// Its about 4 lines of code.;#ifdef DEBUG;fprintf(stderr, "GLUT_DOWN at %d %d RGB %d %d %d %dn;mousex, mousey, R, G, B, gamerunning);#endif;// 6) XXX Your code to make the ending more dramatic;// make the screen flash or something else in the;// following if else sections;if(R == 255);if(gamerunning == 0);fprintf(stderr, "Game started!n");gamerunning = 1;else if(gamerunning == 1 && B > 10);fprintf(stderr, "You Won:-)n");gamerunning = 2;else if(gamerunning == 1 && G < 100);fprintf(stderr, "Gameover, You Lost:-(n");gamerunning = -1;glutPostRedisplay(), // something moved so redisplay here;break;// 5) XXX Your code to make a new and improved arrow shape;#define NPTS 4 // there are 4 points in this arrowhead shape;// the ashape array contains the original shape XY coordinate pairs;float ashape[NPTS][2] = { 0.0, 0.0, 24.0, -10.0, 20.0, 0, 24.0, 10.0 };void display(void);char text[100], // for holding screen print text;float rev_y, cosdir, sindir;float rshape[NPTS][2], // transformed coordinates for the shape;float dx, dy, hyp, // current motion and its right triangle hypotenuse;int i;static int n_display = 0;glPixelZoom(1, -1), // "Proper" orientation for pixel ops;glRasterPos2f(0.0, ppm_ht), // XY position to draw the maze;// now put the maze image into the frame buffer (try leaving this out);glDrawPixels(ppm_wid, ppm_ht, GL_RGB, GL_UNSIGNED_BYTE, pixels);// 4) XXX Your code to print a display cycle counter in lower left;// about 3 lines - look back to GLBase.c;switch(gamerunning);case -1;draw_string(10.0, ppm_ht - 20.0, "You Lost:-(");break;case 0;draw_string(10.0, ppm_ht - 20.0, "Start on Red Circle");break;case 1;draw_string(10.0, ppm_ht - 20.0, "GAME Running");sprintf(text, "X = %3d Y = %3d", arrowx, arrowy);draw_string(10.0, ppm_ht - 40.0, text);break;case 2;draw_string(10.0, ppm_ht - 20.0, "You Won:-)");break;// 2) XXX Your code to compute cosdir and sindir from the values;// of the current and last arrow positions (arrowx, arrow_lastx;// arrowy, arrow_lasty... BEWARE arrow_lastxy are floats;// you should first compute dx, dy and hyp then sindir and cosdir;// about 5 lines of code.;#ifdef DEBUG;fprintf(stderr, "%d %g %d %g %g %g %g %g %gn;arrowx, arrow_lastx, arrowy, arrow_lasty, dx, dy, hyp, sindir, cosdir);#endif;rev_y = ppm_ht - arrowy - 1, // rev_y is just Y flipped;for(i = 0, i < NPTS, i++);// 3) XXX Your code to produce properly transformed 2D;// shape coordinates in the rshape array by using the;// current arrow position, the ashape values and the;// sindir, cosdir values you computed for item 2);// Two to four lines depending on your spacing.;// Make the color coded filled arrow shape;if(gamerunning == 1);glColor3ub(0, 0, 255);else;glColor3ub(255, 0, 0);glBegin(GL_POLYGON);for(i = 0, i < NPTS, i++);glVertex2fv(rshape[i]);glEnd();// It looks nicer with a black outline;glColor3ub(0, 0, 0);glBegin(GL_LINE_LOOP);for(i = 0, i < NPTS, i++);glVertex2fv(rshape[i]);glEnd();glutSwapBuffers();// 7) XXX Your extra credit code could go anywhere


Paper#66011 | Written in 18-Jul-2015

Price : $32