GLUT - how to smoothly translate a ball? -


i'm making ball in field may moves right or left based on keyboard input. here's full code:

#include <windows.h> //for sleep(...) functionality #include <stdlib.h> #include <stdio.h> #include <gl/glut.h>  glfloat angle = 0.0;  static int mywindow;  void keyboard_handler(unsigned char key, int x, int y);   float ball_posx = 0.0; void ball(void) {     glcolor4f(1.0f,0.0f,0.0f,0.6f); //set ball colour gltranslatef(ball_posx, 0.0, 2); //moving toward screen bit on creation glutsolidsphere(0.25,100,100); //this damn ball }  void floor(void) { //floors flat surface facing down support logic ball slide     glbegin(gl_lines); glcolor3f(1.0, 1.0, 1.0);     (glfloat = -2.5; <= 2.5; += 0.25) {     glvertex3f(i, -0.25, 2.5);     glvertex3f(i, -0.25, -2.5);     glvertex3f(2.5, -0.25, i);     glvertex3f(-2.5, -0.25, i);     } glend(); }    void init(void) {     glenable(gl_depth_test);     glenable(gl_lighting);     glenable(gl_light0); }  float cam_posx = 0.0; float cam_posy = 0.5; float cam_posz = 5.0;  void display(void) {     glclearcolor(1.0,1.0,1.0,1.0);      //to add background color (white)     glclear(gl_color_buffer_bit | gl_depth_buffer_bit); //clear buffer colour , depth     glloadidentity();     glulookat(cam_posx, cam_posy, cam_posz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);  //camera! (cam position x, cam position y, cam position z, cam target x, cam target y, cam target z,  position x, position y, position z) floor(); ball();     glutswapbuffers();     angle += 0.05; //to affect glrotate function }  void reshape(int w, int h) {     glviewport(0, 0, (glsizei)w, (glsizei)h);     glmatrixmode(gl_projection);     glloadidentity();     gluperspective(60, (glfloat)w / (glfloat)h, 1.0, 100.0);     glmatrixmode(gl_modelview); }    int main(int argc, char **argv) {     glutinit(&argc, argv);     glutinitdisplaymode(glut_double | glut_rgba | glut_depth);      // set display buffer      glutinitwindowsize(500, 500);       //window's size     glutinitwindowposition(100, 100);   //window's position     mywindow = glutcreatewindow("hendra ganteng, read controls.txt, insist!");  //window's title     init();     glutdisplayfunc(display);     glutkeyboardfunc(keyboard_handler);      glutidlefunc(display);     glutreshapefunc(reshape);     glutmainloop();     return 0; }  void keyboard_handler(unsigned char key, int x, int y) { switch(key) { //camera case 'a':     if(cam_posx > -3)     {         cam_posx = cam_posx - 1;     }     break; case 'd':     if(cam_posx < 3)     {         cam_posx = cam_posx + 1;     }     break;  case 's':     if(cam_posy > 0.5)     {         cam_posy = cam_posy - 1;     }     break; case 'w':     if(cam_posy < 3)     {         cam_posy = cam_posy + 1;     }     break; case 'x':     if(cam_posz == 5.0)     {         cam_posz = 4.0;     }     else         cam_posz = 5.0;     break;   //ball case ',':     if(ball_posx > -2)     {         for(int i=0; i<5; i++)         {             sleep(200);             ball_posx = ball_posx - 0.2;         }     }     break; case '.':     if(ball_posx < 2)     {         ball_posx = ball_posx + 1;     }     break; }

}

however, ball won't move smoothly if change translation. tried "sleep" method when moving left, instead of moving every 0,2 second until reach destination, waits 1 second translate without delay. how make translation smooth?

try this: make 1 more function glutidlefunc in main. let's call function idle(). in idle move last line of display function.

angle += 0.05; //to affect glrotate function

also there no glrotate call in code. try 

void display(void) {     glclearcolor(1.0,1.0,1.0,1.0);      //to add background color (white)     glclear(gl_color_buffer_bit | gl_depth_buffer_bit); //clear buffer colour , depth     glloadidentity();     glrotate(angle, 0.0, 1.0, 0.0);//for horizontal rotation     glulookat(cam_posx, cam_posy, cam_posz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);  //camera! (cam position x, cam position y, cam position z, cam target x, cam target y, cam target z,  position x, position y, position z) floor(); ball();     glutswapbuffers(); }

your new idle() function variable computations.


Comments

Post a Comment

Popular posts from this blog

.htaccess - First slash is removed after domain when entering a webpage in the browser -

sometimes when hit address of webpage in browser, removes first slash after domain. examples: www.mywebsite.com/scripts/script_6.php -> trying load www.mywebsite.comscripts/script_6.php www.mywebsite.com/test.php -> trying load www.mywebsite.comtest.php after entering again, loads page. a .htaccess settings must wrong: rewritebase / errordocument 404 http://www.mywebsite.com/oops.php errordocument 401 /notallowed.php rewriteengine on # turn on rewriting engine #gzip <ifmodule mod_deflate.c> addoutputfilterbytype deflate text/text text/html text/plain text/xml text/css application/x- javascript application/javascript </ifmodule> #end gzip rewritecond %{http_host} ^mywebsite\.com rewriterule ^(.*)$ http://www.mywebsite.com$1 [r=permanent,l] directoryindex index6.php rewriterule ^termsofuse/?$ termsofuse.php [nc,l] # handle requests "adpolicy" rewriterule ^privacy-policy/?$ privacy-policy.php [nc,l] # handle requ...
Read more

Automatically create pages in phpfox -

i have array of information of places , wanna use them create multiple pages in phpfox site. first tried manually insert data in phpfox database (in tables of phpfox_pages , phpfox_pages_text ). the page shown in site when opening it's link, site says: the page looking cannot found. do know other tables should manipulate make work? or know plugin phpfox same? thanks, solved ( @purefan guide): "pages" has user if take @ phpfox_user table, you'll found out how fetch new records on that. there 2 ambiguous fields in table ( password & password_salt ). can use script create values fields: <?php function generaterandomstring() { $length = 164; $characters = '-_0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz'; $randomstring = ''; ($i = 0; $i < $length; $i++) { $randomstring .= $characters[rand(0, strlen($characters) - 1)]; } return $randomstring; } $ssalt = '';...
Read more

c# - Farseer ContactListener is not working -

i'm using farseer in xna project, have trouble contactlistener. created class contactlistener these 2 error messages , don't know how fix problems. the type or namespace name 'contactlistener' not found (are missing using directive or assembly reference?) the type or namespace name 'contactimpulse' not found (are missing using directive or assembly reference?) what wrong contactlistener class? class mycontactlistener: contactlistener { void begincontact(contact contact) { /* handle begin event */ } void endcontact(contact contact) { /* handle end event */ } void presolve(contact contact, ref manifold oldmanifold) { fixture fixturea = contact.fixturea; fixture fixtureb = contact.fixtureb; if (fixtureb.collisioncategories == category.cat10) { contact.enabled = false; } } void postsolve(contact contact, ref contactimpulse impulse) { /* handle post-solve event */ } }...
Read more