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PSP-Programming.com Forums > PSP > C/C++ Help > Background Doesnt Change
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Author Topic: Background Doesnt Change  (Read 2232 times)
MailasG
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« on: October 18, 2006, 05:06:16 PM »
It only changes to both Back2.png and Back1.png then I press the L trigger:
Code:

if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 1))
{
Background = loadImage("./Images/Backgrounds/Back2.png");
currentBack = 2;
}
if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 2))
{
Background = loadImage("./Images/Backgrounds/Back3.png");
currentBack = 3;
}
if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 3))
{
Background = loadImage("./Images/Backgrounds/Back1.png");
currentBack = 1;
}
if((pad.Buttons & PSP_CTRL_LTRIGGER) && (currentBack == 1))
{
Background = loadImage("./Images/Backgrounds/Back3.png");
currentBack = 3;
}
if((pad.Buttons & PSP_CTRL_LTRIGGER) && (currentBack == 2))
{
Background = loadImage("./Images/Backgrounds/Back1.png");
currentBack = 1;
}
if((pad.Buttons & PSP_CTRL_LTRIGGER) && (currentBack == 3))
{
Background = loadImage("./Images/Backgrounds/Back2.png");
currentBack = 2;
}

And it doesnt change to back 3 when I press the L trigger, and it doesnt change at all when I press R. No errors though.
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« Reply #1 on: October 18, 2006, 05:20:44 PM »
Try a different approach:
load the backgrounds into an array. do this outside your game loop.

Code:

Image* backgroundArray[] = {loadImage("./Images/Backgrounds/Back1.png"), loadImage("./Images/Backgrounds/Back2.png"), loadImage("./Images/Backgrounds/Back3.png")};


then try this:

Code:

if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 1))
{
Background = backgroundArray[1];
currentBack = 2;
}
if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 2))
{
Background = backgroundArray[2];
currentBack = 3;
}
if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 3))
{
Background = backgroundArray[0];
currentBack = 1;
}
if((pad.Buttons & PSP_CTRL_LTRIGGER) && (currentBack == 1))
{
Background = backgroundArray[2];
currentBack = 3;
}
if((pad.Buttons & PSP_CTRL_LTRIGGER) && (currentBack == 2))
{
Background = backgroundArray[0];
currentBack = 1;
}
if((pad.Buttons & PSP_CTRL_LTRIGGER) && (currentBack == 3))
{
Background = backgroundArray[1];
currentBack = 2;
}
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MailasG
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« Reply #2 on: October 18, 2006, 06:41:37 PM »
Well the arrays didn't work, just gave me errors so I tried another way, still doesnt change!!!!

Code:

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspiofilemgr.h>
#include <pspgu.h>
#include <png.h>
#include <stdlib.h>
#include <string.h>
#include <pspaudio.h>
#include <pspaudiolib.h>
#include <psppower.h>
#include <psprtc.h>
extern "C"
{
#include "graphics.h"
}
#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16))

PSP_MODULE_INFO("MailasProduct", 0, 1, 1);

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

//GLOBAL VARIABLES
int main(void) {
    SetupCallbacks();
    initGraphics();

    SceCtrlData pad, lastpad;

    sceCtrlReadBufferPositive(&lastpad, 1);
   
    int MegaX = 27;
    int MegaY = 136;
   
    int ProtoX = 427;
    int ProtoY = 136;
   
    int megaPelX = 27;
   
    int shoot = 0;
    int currentBack = 1;

   
    Image* MegaImage;
MegaImage = loadImage("./Images/M_Plat.png");

    Image* ProtoImage;
ProtoImage = loadImage("./Images/P_Plat.png");

    Image* PelletImage;
PelletImage = loadImage("./Images/pellet.png");

Image* Background = loadImage("./Images/Backgrounds/Back1.png");




       while(1) {
      sceCtrlReadBufferPositive(&pad, 1);
     
if(pad.Buttons & PSP_CTRL_RIGHT)
{
shoot=1;
}

if(shoot==1) {
megaPelX+=1;
blitAlphaImageToScreen(0, 0, 8, 6, PelletImage, megaPelX, MegaY); }



if(MegaY > (272 - 26))
{
MegaY = (272 - 26);
}

if(MegaY < 0)
{
MegaY = 0;
}

if(ProtoY > (272 - 26))
{
ProtoY = (272 - 26);
}

if(ProtoY < 0)
{
ProtoY = 0;
}

if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 1))
{
Background = loadImage("./Images/Backgrounds/Back2.png");
currentBack = currentBack+1;
}

if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 2))
{
Background = loadImage("./Images/Backgrounds/Back3.png");
currentBack = currentBack+1;
}

if((pad.Buttons & PSP_CTRL_RTRIGGER) && (currentBack == 3))
{
Background = loadImage("./Images/Backgrounds/Back1.png");
currentBack = 1;
}







      if(pad.Buttons & PSP_CTRL_UP)
      {
       MegaY-=2;                    
      }
     
      if(pad.Buttons & PSP_CTRL_DOWN)
      {
       MegaY+=2;                    
      }
     
        if(pad.Buttons & PSP_CTRL_TRIANGLE)
      {
       ProtoY-=2;                    
      }
     
      if(pad.Buttons & PSP_CTRL_CROSS)
      {
       ProtoY+=2;                    
      }
     
      blitAlphaImageToScreen(0, 0, 480, 272, Background, 0, 0);
      blitAlphaImageToScreen(0, 0, 33, 26, MegaImage, MegaX, MegaY);
      blitAlphaImageToScreen(0, 0, 24, 25, ProtoImage, ProtoX, ProtoY);
     
       sceDisplayWaitVblankStart();
 flipScreen();

      }
      return 0;
      }


What ever I do it just wont change!
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Insert_Witty_Name
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« Reply #3 on: October 18, 2006, 10:13:13 PM »
Code:
#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspiofilemgr.h>
#include <pspgu.h>
#include <png.h>
#include <stdlib.h>
#include <string.h>
#include <pspaudio.h>
#include <pspaudiolib.h>
#include <psppower.h>
#include <psprtc.h>
extern "C"
{
#include "graphics.h"
}
#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16))

PSP_MODULE_INFO("MailasProduct", 0, 1, 1);

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
          sceKernelExitGame();
          return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
          int cbid;

          cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
          sceKernelRegisterExitCallback(cbid);

          sceKernelSleepThreadCB();

          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;

          thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
          if(thid >= 0) {
                    sceKernelStartThread(thid, 0, 0);
          }

          return thid;
}

//GLOBAL VARIABLES
int main(void) {
    SetupCallbacks();
    initGraphics();

    SceCtrlData pad, lastpad;

    sceCtrlReadBufferPositive(&lastpad, 1);
   
    int MegaX = 27;
    int MegaY = 136;
   
    int ProtoX = 427;
    int ProtoY = 136;
   
    int megaPelX = 27;
   
    int shoot = 0;
    int currentBack = 0;

   
    Image* MegaImage;
MegaImage = loadImage("./Images/M_Plat.png");

    Image* ProtoImage;
ProtoImage = loadImage("./Images/P_Plat.png");

    Image* PelletImage;
PelletImage = loadImage("./Images/pellet.png");

Image* Background[3];
Background[0] = loadImage("./Images/Backgrounds/Back1.png");
Background[1] = loadImage("./Images/Backgrounds/Back2.png");
Background[2] = loadImage("./Images/Backgrounds/Back3.png");

       while(1) {
      sceCtrlReadBufferPositive(&pad, 1);
     
if(pad.Buttons & PSP_CTRL_RIGHT)
{
shoot=1;
}

if(shoot==1) {
megaPelX+=1;
blitAlphaImageToScreen(0, 0, 8, 6, PelletImage, megaPelX, MegaY);
}



if(MegaY > (272 - 26))
{
MegaY = (272 - 26);
}

if(MegaY < 0)
{
MegaY = 0;
}

if(ProtoY > (272 - 26))
{
ProtoY = (272 - 26);
}

if(ProtoY < 0)
{
ProtoY = 0;
}

if(pad.Buttons & PSP_CTRL_RTRIGGER)
{
  (currentBack < 2) ? currentBack++ : currentBack = 0;
}

      if(pad.Buttons & PSP_CTRL_UP)
      {
       MegaY-=2;
      }
     
      if(pad.Buttons & PSP_CTRL_DOWN)
      {
       MegaY+=2;                    
      }
     
        if(pad.Buttons & PSP_CTRL_TRIANGLE)
      {
       ProtoY-=2;                    
      }
     
      if(pad.Buttons & PSP_CTRL_CROSS)
      {
       ProtoY+=2;                    
      }
     
      blitAlphaImageToScreen(0, 0, 480, 272, Background[currentBack], 0, 0);
      blitAlphaImageToScreen(0, 0, 33, 26, MegaImage, MegaX, MegaY);
      blitAlphaImageToScreen(0, 0, 24, 25, ProtoImage, ProtoX, ProtoY);
     
       sceDisplayWaitVblankStart();
 flipScreen();

      }
      return 0;
      }
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MailasG
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« Reply #4 on: October 19, 2006, 03:02:54 PM »
Im really sorry, i wasn't asking for a whole peice of code though like you always have to do it all for me, but atleast now I know how to use arrays.

I know you're probably really annoyed at me right now, so Im sorry.
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« Reply #5 on: October 19, 2006, 07:03:59 PM »
Don't apologise mate.

If I was 'annoyed' I wouldn't have helped at all Wink
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Last updated 6th Oct 06 - Tutorial 2 added.
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