[pirata nervo]

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How to make a player jump!!!

Makefile:

TARGET = Lesson7 
OBJS = main.o      
 
INCDIR =  
CFLAGS = -G4 -Wall -O2  
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti 
ASFLAGS = $(CFLAGS) 
 
LIBDIR = 
LDFLAGS = 
STDLIBS= -losl -lpng -lz \ 
        -lpspsdk -lpspctrl -lpspumd -lpsprtc -lpsppower -lpspgu -lpspaudiolib -lpspaudio -lm 
LIBS=$(STDLIBS)$(YOURLIBS) 
 
 
EXTRA_TARGETS = EBOOT.PBP 
PSP_EBOOT_TITLE = Lesson7 
 
PSPSDK=$(shell psp-config --pspsdk-path) 
include $(PSPSDK)/lib/build.mak

Using Lesson4 sprite.

#include <oslib/oslib.h> 
//Necessary to create eboot 
 
PSP_MODULE_INFO("OSLib Sample", 0, 1, 1); 
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER | THREAD_ATTR_VFPU); 
 
//declaration of the pointers of our images 
OSL_IMAGE *background, *sprite; 
 
//definitions 
#define DOWN   0 
#define UP     35 
#define RIGHT  70 
#define LEFT   105 
 
//variables 
int sprite_position; 
int sprite_march; 
 
int sprite_accel = 1; 
int sprite_vel_y = 0; 
int sprite_jumping = 0; 
 
//function declarations 
void Buttons(); 
void SpriteAnimate(); 
 
int main() 
{ 
    //Initialization of the Oslib library 
    oslInit(0); 
 
    //Initialization of the graphics mode 
    oslInitGfx(OSL_PF_8888, 1); 
 
    //Sets the transparency color (pink) 
    oslSetTransparentColor(RGB(255,0,255)); 
 
    //loads our images into memory 
    background = oslLoadImageFile("background.png", OSL_IN_RAM, OSL_PF_5551); 
    sprite = oslLoadImageFile("sprite.png", OSL_IN_RAM, OSL_PF_5551); 
 
    //Disables the transpaent color (pink) 
    oslDisableTransparentColor(); 
 
    //verification that all files are present 
    if (!background || !sprite) 
        oslDebug("It is impossible to load one or more of the images that are required in this program. Please make sure you have all the files required in the eboot folder"); 
 
        //Sets the sprite's original position on the screen 
    sprite->x = 100; // (Or wherever floor is) 
    sprite->y = 210; 
    sprite_position = RIGHT; 
 
    //main while loop 
    while (!osl_quit) 
    { 
        //To be able to draw on the screen 
        oslStartDrawing(); 
 
        //calls the Buttons() function 
        Buttons(); 
 
        //Draw the images to the screen 
        oslDrawImage(background); 
        oslDrawImage(sprite); 
 
        //Ends drawing mode 
        oslEndDrawing(); 
 
        //Synchronizes the screen 
        oslSyncFrame(); 
    } 
 
    //Terminate the program 
    oslEndGfx(); 
    oslQuit(); 
    return 0; 
} 
 
 
void Buttons() 
{ 
    //initiate the PSP's buttons 
    oslReadKeys(); 
 
    if (osl_keys->held.right) 
    { 
        sprite->x += 2; 
        sprite_position = RIGHT; 
        SpriteAnimate(); 
    } 
        if (osl_keys->held.left) 
    { 
        sprite->x -= 2; 
        sprite_position = LEFT; 
        SpriteAnimate(); 
    } 
 
// Here it is the begin of the player jump code 
           if (osl_keys->pressed.cross && sprite->y == 210) 
           { 
              sprite_vel_y = 15; 
              sprite_jumping = 1; 
           } 
 
           if (sprite_jumping == 1)             /* Move sprite if we are jumping */ 
           { 
              sprite_vel_y = sprite_vel_y - sprite_accel; 
              sprite->y = sprite->y - sprite_vel_y; 
           } 
 
           if (sprite->y >= 210)          /* Check to see if sprite has hit floor */ 
           { 
              sprite_vel_y = 0; 
              sprite_jumping = 0; 
              sprite->y = 210; 
           } 
// Here it is the end of the player jump code 
 
    //If a button is not pressed 
    if (!osl_keys->held.value) 
    { 
    //Start the variable over for when a button is pressed again 
        sprite_march = 0; 
 
        //Sets the sprite's direction 
        oslSetImageTileSize(sprite,0,sprite_position,22,35); 
    } 
} 
 
 
void SpriteAnimate() 
   { 
        //Moves the sprite in the row that it is in 
        sprite_march++; 
 
        //Moves the sprite constantly 
        oslSetImageTileSize(sprite,(sprite_march * 22),sprite_position,22,35); 
 
        //resets the sprite movement in that row 
        if (sprite_march == 6) sprite_march = 0; 
 
}

:mrgreenthumbsup: :mrgreenthumbsup:

The only thing that i willexplaine is the jumping code!

first we need to create three variables(integers) and set their value:

int sprite_accel = 1; the value of the integer sprite_accel is 1
int sprite_vel_y = 0; the value of the integer sprite_vel_y is 0
int sprite_jumping = 0; the value of the integer sprite_jumping is 0

And now we can type the player jump code:

if (osl_keys->pressed.cross && sprite->y == 210) if the button cross is pressed and the sprite(coordinate y) is 210
{
sprite_vel_y = 15; then the integer sprite_vel_y is 15
sprite_jumping = 1; and the integer sprite_jumping is 1
}

if (sprite_jumping == 1) if the integer sprite_jumping is 1
{
sprite_vel_y = sprite_vel_y - sprite_accel; then the integer sprite_vel_y is (sprite_vel_y - sprite_accel
sprite->y = sprite->y - sprite_vel_y; and the sprite(coordinate y) is (sprite(coordinate y) - sprite_vel_y)
}

if (sprite->y >= 210) if the sprite(coordinate y) is greater or iqual than 210
{
sprite_vel_y = 0; then the integer sprite_vel_y is 0
sprite_jumping = 0; and the integer sprite_jumping is 0
sprite->y = 210; and the sprite(coordinate y) is 210
}

First, we need to set the variables and set their value,
and second, the player only jumps when the cross button is pressed and when the sprite(coordinate y) is 210.

:D