sdl 2 - SDL/C++ camera bether ways? -

-

at moment handle camera that:

if (window.rightarrow) {             //player.addxposition(player_speed);             if (player.getposition().x > 400 - 50 / 2 && !cam.active)             {                 cam.active = true;             }             if (cam.active && !blockedleft)             {                 rect.updatecameraleft(player_speed);                 enemygrp.updatecameraleft(player_speed);             }             else             {                 player.addxposition(player_speed);             }              //rect.updatecameraleft(player_speed);         }         else if (window.leftarrow)         {             if(cam.active && !blockedright)             {                 rect.updatecameraright(player_speed);                    enemygrp.updatecameraright(player_speed);             }             else              {                 player.subxposition(player_speed);             }          //player.subxposition(player_speed);             //rect.updatecameraright(player_speed);         }

so if player greater 400 - "the player size" activate camera. if camera active player dosnt move. every gameobject rects or enemygrp moved new position.

by displacement of other elements generated move illusion.

maybe bether way or way go 2d games?

thanks answer!

render function:

void window::update(sdl_rect* rects, int rectssize, sdl_rectsconfig* config, sdl_rect* ppositon, sdl_rect* destpositon, sdl_rect* weapons, int weaponsize, sdl_rect* destweapons, int destsize, sdl_rect* enemys, sdl_rect* destenemys, int enemyssize)         {             sdl_setrendertarget(renderer, texture);             sdl_setrenderdrawcolor(renderer, 255, 255, 255, 0x00);              sdl_renderclear(renderer);              sdl_rendercopy(renderer, background, null, null);              (int = 0; < rectssize; i++)             {                 if (config[i].r != null && config[i].g != null && config[i].b != null)                 {                     sdl_renderdrawrect(renderer, &rects[i]);                     sdl_setrenderdrawcolor(renderer, config[i].r, config[i].g, config[i].b, config[i].a);                     sdl_renderfillrect(renderer, &rects[i]);                 }                 if (config[i].image != null && config[i].font == null)                 {                     sdl_rendercopy(renderer, config[i].image, null, &rects[i]);                 }                 else if (config[i].image == null && config[i].font != null)                 {                     s << config[i].text;                     surfacemessage = ttf_rendertext_solid(config[i].font, s.str().c_str(), {0, 0, 0}); // ttf_rendertext_solid used on sdl_surface have create surface first                     if (surfacemessage == null)                     {                         printf("unable render text surface! sdl_ttf error: %s\n", ttf_geterror());                     }                     message = sdl_createtexturefromsurface(renderer, surfacemessage);                      sdl_rendercopy(renderer, message, null, &rects[i]);                     sdl_freesurface(surfacemessage);                     sdl_destroytexture(message);                     s.str("");                     s.clear();                 }             }              /*sdl_renderdrawrects(renderer, rects, rectssize);             sdl_setrenderdrawcolor(renderer, 0x00, 0x00, 0x00, 0x00);             sdl_renderfillrects(renderer, rects, rectssize);*/              //example render in picture in rects (this clickeble)             if (weaponsize == destsize) {                 (int = 0; < weaponsize; i++)                 {                     sdl_rendercopy(renderer, weaponsheet, &destweapons[i], &weapons[i]);                 }             }else             {                 std::cout << "error: sizes weaponsize , dessize need same." << std::endl;             }              //sdl_rendercopy(renderer, imgs, null, &rects[0]);             if (leftarrow || lastpressed == "sdlk_left") {                 sdl_rendercopyex(renderer, playersheet, destpositon, ppositon, null, null, sdl_flip_horizontal);                 sdl_renderdrawrect(renderer, ppositon);             }             else {                 sdl_rendercopy(renderer, playersheet, destpositon, ppositon);                 sdl_renderdrawrect(renderer, ppositon);             }              (int = 0; < enemyssize; i++)             {                 sdl_rendercopy(renderer, enemysheet, &destenemys[i], &enemys[i]);             }             //render value              //render background             //sdl_rendercopy(renderer, background, {}, &enemys[i]);              sdl_setrendertarget(renderer, null);              sdl_rendercopy(renderer, texture, null, null);             sdl_renderpresent(renderer);         }

i have found this: 

sdl_rendersetviewport(renderer, &cam);

i think can camera :) without moving objects.


Comments

Post a Comment

Popular posts from this blog

Spring Boot + JPA + Hibernate: Unable to locate persister -

-
i trying work entity inside request method of spring boot application. entity in project , pom.xml has dependencies it. why error message?: org.hibernate.unknownentitytypeexception: unable locate persister: com.ric.bill.model.bs.par package com.ric.web; import java.util.concurrent.atomic.atomiclong; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import net.sf.ehcache.cachemanager; import net.sf.ehcache.management.cache; import net.sf.ehcache.management.cachestatistics; import org.hibernate.stat.statistics; import org.springframework.beans.factory.annotation.autowired; import org.springframework.boot.autoconfigure.domain.entityscan; import org.springframework.cache.annotation.enablecaching; import org.springframework.transaction.annotation.enabletransactionmanagement; import org.springframework.transaction.annotation.propagation; import org.springframework.transaction.annotation.transactional; import org.springframework.web.bind.annotati
Read more

go - Golang: panic: runtime error: invalid memory address or nil pointer dereference using bufio.Scanner -

-
i implementing go program uses bufio.scanner , bufio.writer have packaged code follows package main import ( "fmt" "player/command" "strings" ) func main() { //enter code here. read input stdin. print output stdout commands.scanner.scan() { //scan new line , send comand variable check command exist or not input := strings.split(strings.trim(commands.scanner.text(), " "), " ") command := input[0] if command == "" { fmt.printf("$ %s:", commands.pwd) continue } if !commands.commands[command] { commands.throwerror("cannot recognize input.") } else { commands.execute(command, input[1:], nil) } fmt.printf("$ %s:", commands.pwd) } } i using init.go file in main package follows package main import ( "flag" "player/sourc
Read more

c - double free or corruption (fasttop) -

-
this code reads null terminated string file (file containing null terminated strings & should provide index wanted string). error: *** error in `./main': double free or corruption (fasttop): 0x090a4a80 *** aborted code: char *tmp_realloc=null; char *sstring=null; int i=1; /*set file pointer point string*/ fseek(fh,index,seek_set); sstring=(char*)malloc(sizeof(char)); if(sstring == null) return null; tmp_realloc=sstring; while( (*(sstring+i-1)=(char)fgetc((file*)fh)) != 0x0 ) { /*reallocate more memory*/ tmp_realloc=(char*)realloc((char*)sstring,++i); /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strcpy((char*)tmp_realloc,(char*)sstring); free(sstring); sstring=tmp_realloc; } } could tell me pointer causing issue (& reason) ? remove part /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strc
Read more