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Jumping

struct object {	// your own defs can go here for your object
	int xpos, ypos; 
	int jump; // current speed of jump or falling
	int jump_flag}
	
jump_flag is set to 0

Assigning gravity and jump controls (hopefully easy to understand):

old_x=xpos
old_y=ypos

move object left and right

if collided 
	move object back to old position

if jump_flag
	ypos plus jump
	if collided and jump>0 (we've hit something above)
		jump_flag=0
		jump=0 (reset the jump direction so gravity kicks in as normal)
		set ypos back to original
	else if jump<0 and collided (we've hit the ground)
		set ypos back to original
		jump=0
		jump_flag=0 (gravity can kick in as normal)

// now use the jump value for falling using gravity controls
jump-gravity (negative number now cos falling)
if jump > -max_falling (can't fall any faster)
	jump = max_falling

ypos+jump
if collided
	jump=0 (reset falling value)
	ypos=old_y

// now check if able to jump
if JUMP_BUTTON_PRESSED and jump_flag=0 and jump=0 (not falling either)
	jump_flag=1
	jump=5 (this value increase and decreases depending on speed of jump)

old_x=xpos
old_y=ypos
jump_flag

int old_x=xpos
int old_y=ypos
jump_flag=0;

#include "DarkGDK.h"
#include <time.h>

int player;
void Load_media()
	{
	dbLoadImage("Media//green.bmp",1);
	dbLoadImage("Media//player.bmp",2);
	dbLoadImage("Media//Backdrop.bmp",3);
	}
 
void generate_level(int num_blocks, int Xblock_size, int Yblock_size)
	{
		int player=100;
		int gap=1000;
		int Yblock=0;
		dbSprite(player,10,10,2);
		for(int i=0; i<num_blocks; i++)
		{
		Yblock=dbSpriteY(i)+dbRnd(gap);
		dbSprite(i,dbRnd(500),Yblock,1);
		dbSizeSprite(i, Xblock_size,Yblock_size);
		}
	}
int x=100;
void movement(int player)
{
	if(dbRightKey()==1){x+=1;}
	if(dbLeftKey()==1){x-=1;}
	dbSprite(player,x,dbSpriteY(player),2);
}

void move_blocks()
{
	for (int i=0; i<40; i++)
	{
	dbMoveSprite(i,-1);
	}
}

void reset_blocks()
{
	for (int i=0;i<40;i++)
	{
		if (dbSpriteY(i) > 1000)
		{
		dbSprite(i,dbRnd(500),-40,1);
		}
	}
}

void jumping()
{

}



void DarkGDK ( void )
{
	
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbSetDisplayMode(500,900,32);
	srand(time(NULL));
	Load_media();
	generate_level(40,40,11);
	

	while ( LoopGDK ( ) )
	{
		movement(100);
		move_blocks();
		reset_blocks();
		dbPasteImage(3,0,0);
		dbSync ( );
	}

	return;
}