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#include "DarkGDK.h"

float x = 10.0f;float y = 10.0f;float z = 10.0f;
float mousex = 0.0f;float mousey = 0.0f;
float depthx = 0.0f;float depthy = 0.0f;
float destx = 10.0f;float destz = 10.0f;
float s = 0.5f;

void DarkGDK ( void )
{
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	dbMakeObjectPlain(1,100,100);
	dbXRotateObject(1,270);
	dbColorObject(1,dbRgb(0,70,0));
	dbPositionObject(1,50,0,50);

	dbMakeObjectSphere(2,1);
	dbPositionObject(2,x,0,z);

	dbXRotateCamera(0,90);
	dbPositionCamera(0,x,y,z);

	while ( LoopGDK ( ) )
	{
		if(dbUpKey())dbMoveCameraUp(0,s);
		if(dbDownKey())dbMoveCameraDown(0,s);
		if(dbLeftKey())dbMoveCameraLeft(0,s);
		if(dbRightKey())dbMoveCameraRight(0,s);
		if(dbScanCode() == 16)dbXRotateCamera(dbCameraAngleX()-0.1f);
		if(dbScanCode() == 30)dbXRotateCamera(dbCameraAngleX()+0.1f);
		
		y -= dbMouseMoveZ()/120;
		mousex = (float)dbMouseX();
		depthx = (dbScreenWidth()/(y*0.8f))/2.0f;
		mousey = (float)(-(dbMouseY()-dbScreenHeight()));
		depthy = (dbScreenHeight()/(y*0.6f))/2.0f;

		if(dbMouseClick() == 2){
			destx = dbCameraPositionX(0)+(mousex/depthx-(y*0.8f));
			destz = dbCameraPositionZ(0)+(mousey/depthy-(y*0.6f));
		}

		if((int)dbObjectPositionX(2) != (int)destx || (int)dbObjectPositionZ(2) != (int)destz){
			dbPointObject(2,destx,dbObjectPositionY(2),destz);
			dbMoveObject(2,0.1f);
		}

		dbPositionCamera(0,dbCameraPositionX(),y,dbCameraPositionZ());
		dbPositionObject(2,dbObjectPositionX(2),0,dbObjectPositionZ(2));
		
		dbText(1,1,"Press q & a to rotate camera up and down.");
		dbText(1,15,"CameraAngleX:");
		dbText(115,15,dbStr(dbCameraAngleX()));
		dbText(1,30,"U,D,L,R to move camera.");
		dbText(1,45,"Right Click to move object.");
		dbText(1,60,"Use mouse wheel to zoom.");

		dbSync ( );
	}
	return;
}

#define DIRECTINPUT_VERSION 0x0700

#include <DarkGDK.h>
#include <Dinput.h>

void MoveObjectRelToCamera(int nObj, float dx, float dy, float dz);

// models
int nPlane=1;
int nTroll=2;

// images
int nFloorImage=1;

void DarkGDK ( void )
{
	float camPitch, camYaw, xpos=0.0f, ypos=0.0f, zpos=0.0f, rotx=0.0f;

	dbSetDisplayMode( 800, 600, 32 );
	dbSyncOn( );
	dbSyncRate( 60 );
	dbAutoCamOff();

	// scene
	dbSetAmbientLight( 95 );
	dbColorBackdrop( dbRGB(0, 0, 0) );
	dbPositionCamera( 0.0f, 1.0f, -4.0f );

	// textures
	dbLoadImage( "../Media/Floor.tga", nFloorImage );

	// objects
	dbLoadObject( "../Media/Walk.x", nTroll );
	dbScaleObject( nTroll, 3.0f, 3.0f, 3.0f );
	dbSetObjectSpeed( nTroll, 10 );
	dbLoopObject(nTroll);

	dbLoadObject( "../Media/Plane.x", nPlane );
	dbTextureObject( nPlane, 0, nFloorImage );

	while ( LoopGDK ( ) )
	{
		// update camera
		camYaw = dbCameraAngleY( );
		camPitch = dbCameraAngleX(  );
		if ( dbUpKey() )
			dbXRotateCamera( camPitch+1.0f );
		if ( dbDownKey() )
			dbXRotateCamera( camPitch-1.0f );
		if ( dbLeftKey() )
			dbYRotateCamera( camYaw-1.0f );
		if ( dbRightKey() )
			dbYRotateCamera( camYaw+1.0f );
		if  ( dbKeyState( DIK_A) )
			dbMoveCamera( 0.25f );
		if  ( dbKeyState( DIK_Z) )
			dbMoveCamera( -0.25f );

		if ( dbKeyState( DIK_S ) )
			MoveObjectRelToCamera( nTroll, -0.1f, 0.0f, 0.0f );
		if ( dbKeyState( DIK_F ) )
			MoveObjectRelToCamera( nTroll, 0.1f, 0.0f, 0.0f );
		if ( dbKeyState( DIK_E ) )
			MoveObjectRelToCamera( nTroll, 0.0f, 0.0f, 0.1f );
		if ( dbKeyState( DIK_D ) )
			MoveObjectRelToCamera( nTroll, 0.0f, 0.0f, -0.1f );
		dbSync ( );
	}
}

void MoveObjectRelToCamera(int nObj, float dx, float dy, float dz)
{
	int nVectorWorldTroll=1;
	int nVectorCameraTroll=2;
	int nMatWorld=4;
	int nMatView=5;
	int nMatProj=6;

	dbMakeVector3(nVectorWorldTroll);
	dbMakeVector3(nVectorCameraTroll);
	dbMakeMatrix4(nMatWorld);
	dbMakeMatrix4(nMatView);
	dbMakeMatrix4(nMatProj);

	// load the world position of troll into nVectorWorldTroll vector
	dbSetVector3( nVectorWorldTroll, dbObjectPositionX(nTroll), dbObjectPositionY(nTroll), dbObjectPositionZ(nTroll) );

	// transform world troll coordinates to view space
	dbViewMatrix4(nMatView);
	dbTransformCoordsVector3( nVectorCameraTroll, nVectorWorldTroll, nMatView );

	dbSetVector3( nVectorCameraTroll, dbXVector3(nVectorCameraTroll)+dx, dbYVector3(nVectorCameraTroll)+dy, dbZVector3(nVectorCameraTroll)+dz );

	// transform view spcace coordinates to world (inverse the view matrix)
	dbInverseMatrix4( nMatView, nMatView );
	dbTransformCoordsVector3( nVectorWorldTroll, nVectorCameraTroll, nMatView );
	dbPositionObject( nTroll, dbXVector3(nVectorWorldTroll), dbYVector3(nVectorWorldTroll), dbZVector3(nVectorWorldTroll) );

	dbDeleteVector3(nVectorWorldTroll);
	dbDeleteVector3(nVectorCameraTroll);
	dbDeleteMatrix4(nMatWorld);
	dbDeleteMatrix4(nMatView);
	dbDeleteMatrix4(nMatProj);
}

#include "DarkGDK.h"

float vect = 0;
float height = 0.5f;
float destx = 0;
float destz = 0;
float objx = 0;
float objz = 0;
float camx = 0;
float camy = 30;
float camz = -15;
float camangle = 45;
int obj = 0;

void DarkGDK ( void )
{
	dbSyncOn   ( );
	dbSyncRate ( 60 );
        dbAutoCamOff ( );

	dbMakeObjectSphere(1,1);
	dbPositionObject(1,objx,height,objz);

	dbMakeObjectPlain(2,100,100);
	dbPositionObject(2,0,0,0);
	dbXRotateObject(2,270);
	dbColorObject(2,dbRGB(0,255,0));

	dbXRotateCamera(camangle);
	dbPositionCamera(camx,camy,camz);
	
	while ( LoopGDK ( ) )
	{
		//Move and Rotate the Camera
		if(dbUpKey())dbMoveCamera(0.5f);
		if(dbDownKey())dbMoveCamera(-0.5f);
		if(dbRightKey())dbMoveCameraRight(0,0.5f);
		if(dbLeftKey())dbMoveCameraLeft(0,0.5f);
		//"q" to rotate the camera up
		if(dbScanCode() == 16)dbXRotateCamera(dbCameraAngleX()-0.5f);
		//"a" to rotate the camera down
		if(dbScanCode() == 30)dbXRotateCamera(dbCameraAngleX()+0.5f);
		//set global variables
		objx = dbObjectPositionX(1);
		objz = dbObjectPositionZ(1);
		camx = dbCameraPositionX();
		camy -= dbMouseMoveZ()/120;
		camz = dbCameraPositionZ();
		camangle = dbCameraAngleX();
		//pick the object you want to use(only 1 can be used in the next if statement)
		if(dbMouseClick() == 1){
			obj = dbPickObject(dbMouseX(),dbMouseY(),1,2);
		}
		//This is the block of code I was looking for.
		//Sets the destination for the object
		if(dbMouseClick() == 2 && obj == 1){
			dbPickScreen(dbMouseX(),dbMouseY(),dbCameraPositionY());
			vect = dbABS((dbCameraPositionY()-height)/dbGetPickVectorY());
			destx = dbGetPickVectorX() * vect + dbCameraPositionX();
			destz = dbGetPickVectorZ() * vect + dbCameraPositionZ();
		}
		//color the current object
		if(obj == 1)dbColorObject(1,dbRGB(255,0,0));
		else dbColorObject(1,dbRGB(255,255,255));
		//point and move the object to the destination
		if(objx > destx+0.1 || objx < destx-0.1 || objz > destz+0.1 || objz < destz-0.1){
			dbPointObject(1,destx,height,destz);
			dbMoveObject(1,0.1f);
		}
		//position and rotate the camera
		dbPositionCamera(camx,camy,camz);
		dbXRotateCamera(camangle);
		//update the screen
		dbSync ( );
	}
	return;
}