This creates a button that can be used and checks if the button is pressed. This also can create a sprite and dismiss a certain collar as a button.

You can create a button useing
button *b1= new button(1); // creates new button for sprite ID = 1
button *b2= new button();// creates new button
b2->button1(100,10,"start");// position button 100 in x direction and 10 y direction with start as text
b2->changebuttoncol(r,g,b);// change button collar;
b2->changebuttonborder(w,r,g,b)// change width and outline of button
b2->changetextcol(r,g,b)//change text collar
b2->changetext(texttype,size)// change text collar and size

                                    ` This code was downloaded from The Game Creators
                                    ` It is reproduced here with full permission
                                    ` http://www.thegamecreators.com
                                    
                                    //////////////////////////////////////darkgui.h button////////////////////////

#include "DarkGDK.h"
class button
{
private:
	int xposb;
	int yposb;
	int sizexb;
	char *buttontextb;
	char *texttype;
	int red;
	int green;
	int blue;
	char *spriteb;
	int sizetext;
	int noredb;
	int nogreenb;
	int noblueb;
	int textheight;
	int textred;
	int textgreen;
	int textblue;
	int bottomboxx;
	int bottomboxy;
	int buttonbordersize;
	int buttonborderred;
	int buttonbordergreen;
	int buttonborderblue;
	int bnum;

public:
	button(int buttonnum);
	button();
	~button();
	void button1(int xpos,int ypos, char *buttontext);// change defalt button
	void changetextcol(int redtemp, int greentemp, int bluetemp);//change text collar
	void changebuttoncol(int redtemp, int greentemp, int bluetemp);//change button collar
	void changetext(char *texttype1, int sizetext1);
	void changebuttonborder(int size, int buttonbordred,int buttonbordgreen, int buttonbordblue);
	//void button1(int xpos,int ypos,int sizex, char *buttontext, char *texttype, int sizetext, int red, int green, int blue );
	
	void button2(int xpos,int ypos, char *sprite);
	void SetImageColorKey(int red,int green, int blue);
	
	
	bool checkbuttonpressed(int mousex, int mousey);
	bool checkbuttonmouseover(int mousex, int mousey);
	
};
//////////////////////////////////////darkgui.cpp button////////////////////////
#include "DarkGDK.h"
#include "darkgui.h"



button::button(int buttonnum)
{
	bnum=buttonnum;
	spriteb=NULL;	
}

button::button()
{
	xposb=0;
	yposb=0;
	sizexb=20;
	buttontextb="No Text";
	texttype="Arial";
	textheight=16;
	red=0;
	green=0;
	blue=255;
	noredb=0;
	nogreenb=0;
	noblueb=0;
	spriteb=NULL;
	textred=255;
	textgreen=255;
	textblue=255;
	bottomboxx=xposb+dbTextWidth("No Text")+30;
	bottomboxy=yposb+textheight+4;
	buttonbordersize=1;
	buttonborderred=100;
	buttonbordergreen=100;
	buttonborderblue=100;
	spriteb=NULL;

}
void button::changebuttonborder(int size, int buttonbordred,int buttonbordgreen, int buttonbordblue)
{
	buttonbordersize=size;
	buttonborderred=buttonbordred;
	buttonbordergreen=buttonbordgreen;
	buttonborderblue=buttonbordblue;
}
void button::button1(int xpos,int ypos, char *buttontext)//change default button
{
	xposb=xpos;
	yposb=ypos;
	//int bottomboxx=10;
	bottomboxx=xpos+dbTextWidth(buttontext)+30;
	//int bottomboxy=10;
	bottomboxy=ypos+textheight+4+buttonbordersize;
	
	buttontextb=buttontextb;
	dbInk(dbRgb (red,green,blue), 0);
	dbBox (xpos,ypos,bottomboxx,bottomboxy);

	dbInk(dbRgb(buttonborderred,buttonbordergreen,buttonborderblue),0);
	dbBox(xpos,ypos,bottomboxx,ypos+buttonbordersize);
	dbBox(bottomboxx,ypos,bottomboxx+buttonbordersize,bottomboxy);
	dbBox(xpos,bottomboxy-buttonbordersize,bottomboxx,bottomboxy);
	dbBox(xpos,ypos,xpos+buttonbordersize,bottomboxy);
	//dbBox(bottomboxx,bottomboxy,xpos,bottomboxy+buttonbordersize);
	//dbBox(xpos,bottomboxy+buttonbordersize,xpos,ypos);


	dbInk(dbRgb(textred,textgreen,textblue),0);
	dbText(xpos+15,ypos+buttonbordersize+1,buttontext);

}
void button::changetextcol(int redtemp, int greentemp, int bluetemp)
{
	textred=redtemp;
	textgreen=greentemp;
	textblue=bluetemp;

}
void button::changebuttoncol(int redtemp, int greentemp, int bluetemp)
{
	red=redtemp;
	green=greentemp;
	blue=bluetemp;
}
void button::changetext(char *texttype1, int sizetext1)
{
	texttype=texttype1;
	textheight=sizetext1;

}
void button::button2(int xpos,int ypos, char *sprite)
{
	dbLoadImage (sprite,bnum);
	dbSprite (bnum,xpos,ypos,bnum);
	xposb=xpos;
	yposb=ypos;
	spriteb=sprite;
	bottomboxx=dbSpriteWidth(bnum);
	bottomboxy=dbSpriteHeight (bnum);
	
}
void button::SetImageColorKey(int red,int green, int blue)
{
	noredb=red;
	nogreenb=green;
	noblueb=blue;
	dbSetImageColorKey(red,green,blue);
}
button::~button()
{
	
	dbDeleteSprite ( bnum );
	
}
bool button::checkbuttonpressed(int mousex, int mousey)
{
	bool retbuttonstate=false;
	if(mousex>=xposb&& mousey>=yposb&&mousex<=bottomboxx&&mousey<=bottomboxy&&dbMouseClick()==1)
	{
		retbuttonstate=true;
	}
	return retbuttonstate;
}
bool button::checkbuttonmouseover(int mousex, int mousey)
{
	bool retbuttonstate=false;
	if(mousex>=xposb&& mousey>=yposb&&mousex<=bottomboxx&&mousey<=bottomboxy)
	{
		retbuttonstate=true;
	}
	return retbuttonstate;
}

//////////////////////////////////////main//////////////////////////////////////
// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple 2D project that uses Dark GDK
// it can be used as a starting point in making your own 2D games

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"
#include "darkgui.h"



// the main entry point for the application is this function
void DarkGDK ( void )
{
	// in this application a backdrop is loaded and then several
	// animated sprites are displayed on screen

	// when starting a Dark GDK program it is useful to set global
	// application properties, we begin by turning the sync rate on,
	// this means we control when the screen is updated, we also set
	// the maximum rate to 60 which means the maximum frame rate will
	// be set at 60 frames per second
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	
	button *b1= new button(1);
	b1->SetImageColorKey(255,255,255);
	b1->button2(10,10,"image.bmp");
	
	//b1->changebuttoncol(100,100,100);
	//b1->changebuttonborder(1,200,200,200);
	//b1->button1(100,20,"hi");
	button *b2=new button();
	

	while ( LoopGDK ( ) )
	{
		b2->button1(100,10,"start");
		b2->changebuttoncol(100,100,100);
		b2->changebuttonborder(1,200,200,200);
	//b2->button1(100,20,"hi");

		
		//dbText(0,100,dbStr(dbMouseX()));
		if(dbEscapeKey())
		{
			break;
		}
		if(b1->checkbuttonpressed(dbMouseX(),dbMouseY())==true)
		{
			dbText(100,100,"true");
		}
		if(b2->checkbuttonpressed(dbMouseX(),dbMouseY())==true)
		{
			dbText(100,100,"true");
		}
		
		dbSync ( );
	}
	return;
}