void Clear_Random_Field() /* Clear a random field to RB_EMPTY. There's a
great chance, that we get an empty field, so
we retry 50 times */
{
int i,x,y;
for(i=0;i<50;i++) /* Retry 50 times */
{
x=(rand()%(RB_X-2))+1; /* Random position on playing ground */
y=(rand()%(RB_Y-2))+1;
if(RB_Array[x][y]!=RB_EMPTY) /* Clear the symbol, but only if the field isn't empty */
{
RB_Array[x][y]=RB_EMPTY;
Draw_Bitmap(RB_EMPTY,ROP_SRCCOPY,(x-1)*RB_SIZE,(y-1)*RB_SIZE);
break;
}
}
}
void Put_Random_Field(void) /* Put a random symbol in a random field */
{
int i,k,x,y;
do
{
x=(rand()%(RB_X-2))+1; /* Random position on playing ground */
y=(rand()%(RB_Y-2))+1;
i=(rand()%136); /* Fill symbols with probability classes */
if((i>=0) && (i<17)) k=RB_VP;
if((i>=17) && (i<35)) k=RB_MP;
if((i>=35) && (i<60)) k=RB_GP;
if((i>=60) && (i<105)) k=RB_BP;
if((i>=105) && (i<115)) k=RB_LX;
if((i>=115) && (i<125)) k=RB_RX;
if((i>=125) && (i<136)) k=RB_HOLE;
if(RB_Array[x][y]==RB_EMPTY) /* Add the symbol, but only if the field is empty */
{
RB_Array[x][y]=k;
Draw_Bitmap(k,ROP_SRCCOPY,(x-1)*RB_SIZE,(y-1)*RB_SIZE);
break;
}
}while(1); /* Loop until one symbol added in a random field */
}
int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!
int index; // looping var
int dx,dy; // general deltas used in collision detection
static int player_moving = 0; // tracks player motion
static PALETTEENTRY glow = {0,0,0,PC_NOCOLLAPSE}; // used to animation red border
static int glow_count = 0, glow_dx = 5;
// start the timing clock
Start_Clock();
// clear the drawing surface
DDraw_Fill_Surface(lpddsback, 0);
// lock the back buffer
DDraw_Lock_Back_Surface();
// draw the background reactor image
Draw_Bitmap(&reactor, back_buffer, back_lpitch, 0);
// unlock the back buffer
DDraw_Unlock_Back_Surface();
// read keyboard and other devices here
DInput_Read_Keyboard();
// reset motion flag
player_moving = 0;
// test direction of motion, this is a good example of testing the keyboard
// although the code could be optimized this is more educational
if (keyboard_state[DIK_RIGHT] && keyboard_state[DIK_UP])
{
// move skelaton
skelaton.x+=2;
skelaton.y-=2;
dx=2; dy=-2;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_NEAST)
Set_Animation_BOB(&skelaton,SKELATON_NEAST);
} // end if
else
if (keyboard_state[DIK_LEFT] && keyboard_state[DIK_UP])
{
// move skelaton
skelaton.x-=2;
skelaton.y-=2;
dx=-2; dy=-2;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_NWEST)
Set_Animation_BOB(&skelaton,SKELATON_NWEST);
} // end if
else
if (keyboard_state[DIK_LEFT] && keyboard_state[DIK_DOWN])
{
// move skelaton
skelaton.x-=2;
skelaton.y+=2;
dx=-2; dy=2;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_SWEST)
Set_Animation_BOB(&skelaton,SKELATON_SWEST);
} // end if
else
if (keyboard_state[DIK_RIGHT] && keyboard_state[DIK_DOWN])
{
// move skelaton
skelaton.x+=2;
skelaton.y+=2;
dx=2; dy=2;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_SEAST)
Set_Animation_BOB(&skelaton,SKELATON_SEAST);
} // end if
else
if (keyboard_state[DIK_RIGHT])
{
// move skelaton
skelaton.x+=2;
dx=2; dy=0;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_EAST)
Set_Animation_BOB(&skelaton,SKELATON_EAST);
} // end if
else
if (keyboard_state[DIK_LEFT])
{
// move skelaton
skelaton.x-=2;
dx=-2; dy=0;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_WEST)
Set_Animation_BOB(&skelaton,SKELATON_WEST);
} // end if
else
if (keyboard_state[DIK_UP])
{
// move skelaton
skelaton.y-=2;
dx=0; dy=-2;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_NORTH)
Set_Animation_BOB(&skelaton,SKELATON_NORTH);
} // end if
else
if (keyboard_state[DIK_DOWN])
{
// move skelaton
skelaton.y+=2;
dx=0; dy=+2;
// set motion flag
player_moving = 1;
// check animation needs to change
if (skelaton.curr_animation != SKELATON_SOUTH)
Set_Animation_BOB(&skelaton,SKELATON_SOUTH);
} // end if
// only animate if player is moving
if (player_moving)
{
// animate skelaton
Animate_BOB(&skelaton);
// see if skelaton hit a wall
// lock surface, so we can scan it
DDraw_Lock_Back_Surface();
// call the color scanner with WALL_ANIMATION_COLOR, the color of the glowing wall
// try to center the scan in the center of the object to make it
// more realistic
if (Color_Scan(skelaton.x+16, skelaton.y+16,
skelaton.x+skelaton.width-16, skelaton.y+skelaton.height-16,
WALL_ANIMATION_COLOR, WALL_ANIMATION_COLOR, back_buffer,back_lpitch))
{
// back the skelaton up along its last trajectory
skelaton.x-=dx;
skelaton.y-=dy;
} // end if
// done, so unlock
DDraw_Unlock_Back_Surface();
// check if skelaton is off screen
if (skelaton.x < 0 || skelaton.x > (screen_width - skelaton.width))
skelaton.x-=dx;
if (skelaton.y < 0 || skelaton.y > (screen_height - skelaton.height))
skelaton.y-=dy;
} // end if
// draw the skelaton
Draw_BOB(&skelaton, lpddsback);
// animate color
glow.peGreen+=glow_dx;
// test boundary
if (glow.peGreen == 0 || glow.peGreen == 255)
glow_dx = -glow_dx;
Set_Palette_Entry(WALL_ANIMATION_COLOR, &glow);
// draw some text
Draw_Text_GDI("I STILL HAVE A BONE TO PICK!",0,screen_height - 32,WALL_ANIMATION_COLOR,lpddsback);
Draw_Text_GDI("USE ARROW KEYS TO MOVE, <ESC> TO EXIT.",0,0,RGB(32,32,32),lpddsback);
// flip the surfaces
DDraw_Flip();
// sync to 30ish fps
Wait_Clock(30);
// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || keyboard_state[DIK_ESCAPE])
{
PostMessage(main_window_handle, WM_DESTROY,0,0);
} // end if
// return success
return(1);
} // end Game_Main
void Draw_Thread(ULONG ulThreadArg)
{
if(!(habDT=WinInitialize(0UL))) /* Initialize client window */
GEN_ERR(habDT,hwndFrame,hwndClient);
/* Create a message queue */
if(!(hmqDT=WinCreateMsgQueue(habDT,0UL)))
GEN_ERR(habDT,hwndFrame,hwndClient);
if(!(hpsDT=WinGetPS(hwndClient))) /* Get a presentation space for client area */
GEN_ERR(habDT,hwndFrame,hwndClient);
/* Initialize message queue */
WinPostQueueMsg(hmqDT,DT_PAINT,0UL,0UL);
while(qmsqDT.msg!=DT_EXIT)
{
if(WinPeekMsg(habDT, /* Get the message into message queue */
&qmsqDT, /* Message structure */
NULLHANDLE, /* Window filter (none) */
0UL, /* First message ID */
0UL, /* Last message ID */
PM_REMOVE)==FALSE) /* Options (remove message) */
qmsqDT.msg=DT_IDLE; /* If no message available, assume idle */
switch(qmsqDT.msg)
{
case DT_PAINT: /* Repaint client window */
{
RECTL rclDT;
int x,y;
/* Repaint client window aread */
WinQueryWindowRect(hwndClient,&rclDT);
WinFillRect(hpsDT,&rclDT,CLR_WHITE);
for(x=1;x<RB_X;x++) /* Draw the entries on playing ground */
for(y=1;y<RB_Y;y++)
if(RB_Array[x][y]!=RB_EMPTY)
Draw_Bitmap(RB_Array[x][y],ROP_SRCCOPY,(x-1)*RB_SIZE,(y-1)*RB_SIZE);
break;
}
case DT_LBUTTON:
{
int x,y;
/* Left button was pressed, get the location,
add \ to RB_Array, and draw \ bitmap, if
field is emty */
x=(LONGFROMMP(qmsqDT.mp1)/RB_SIZE)+1;
y=(LONGFROMMP(qmsqDT.mp2)/RB_SIZE)+1;
if(RB_Array[x][y]==RB_EMPTY)
{
RB_Array[x][y]=RB_LX;
Draw_Bitmap(RB_LX,ROP_SRCCOPY,(x-1)*RB_SIZE,(y-1)*RB_SIZE);
}
break;
}
case DT_RBUTTON:
{
int x,y;
/* Right button was pressed, get the location,
add / to RB_Array, and draw / bitmap, if
field is emty */
x=(LONGFROMMP(qmsqDT.mp1)/RB_SIZE)+1;
y=(LONGFROMMP(qmsqDT.mp2)/RB_SIZE)+1;
if(RB_Array[x][y]==RB_EMPTY)
{
RB_Array[x][y]=RB_RX;
Draw_Bitmap(RB_RX,ROP_SRCCOPY,(x-1)*RB_SIZE,(y-1)*RB_SIZE);
}
break;
}
case DT_IDLE:
{
if(runRB==TRUE)
{
ULONG x,y,Symbol;
/* Under DOS we would query the time in milliseconds
from the system timer, to adjust graphics. This
is accurate, but in a multitasking in a multitasking
system, we must assume being pre-empted. Therefore
we can't have an exact time bases. Hope that
the system timer counts more often than all 31
milliseconds in future releases/machines */
/* Draw bitmap */
switch(RB_Dir) /* Test that RollBall doesn't leave borders. A
border reverses the direction and produces a
beep */
{
case UP:
RB_PosY++;
if((RB_PosY+RB_SIZE)>=((RB_Y-2)*RB_SIZE))
{
RB_PosY=(RB_Y-3)*RB_SIZE;
RB_Dir=DOWN;
DosBeep(800,50);
}
break;
case DOWN:
RB_PosY--;
if(RB_PosY<0)
{
RB_PosY=0;
RB_Dir=UP;
DosBeep(800,50);
}
break;
case LEFT:
RB_PosX--;
if(RB_PosX<0)
{
RB_PosX=0;
RB_Dir=RIGHT;
DosBeep(800,50);
}
break;
case RIGHT:
RB_PosX++;
if((RB_PosX+RB_SIZE)>=((RB_X-2)*RB_SIZE))
{
RB_PosX=(RB_X-3)*RB_SIZE;
RB_Dir=LEFT;
DosBeep(800,50);
}
break;
}
/* Draw RollBall at new position */
Draw_Bitmap(RB_RB,ROP_SRCCOPY,RB_PosX,RB_PosY);
/* Now, test if the middle of RollBall is over any
symbol. If a symbol is found, add points, deflect
or end game */
/* RB_Array is 1 based, because 0 indices are the
playing ground borders */
x=((RB_PosX)/RB_SIZE)+1;
y=((RB_PosY)/RB_SIZE)+1;
/* A Symbol if RB_SIZE*RB_SIZE in size, that means
RollBall is exactly over a symbol, if the lower
left edges of both symbols match. Then, and only
then, we count points, deflect or loose */
if((RB_PosX==(x-1)*RB_SIZE) && (RB_PosY==(y-1)*RB_SIZE))
Symbol=RB_Array[x][y];
else Symbol=RB_EMPTY;
switch(Symbol)
{
case RB_LX: /* We got a \ deflector */
{
switch(RB_Dir) /* \ deflects direction of RollBall */
{
case RIGHT:
RB_Dir=DOWN; break;
case UP:
RB_Dir=LEFT; break;
case LEFT:
RB_Dir=UP; break;
case DOWN:
RB_Dir=RIGHT; break;
} /* Remove deflector */
RB_Array[x][y]=RB_EMPTY;
break;
}
case RB_RX: /* We got a / deflector */
{
switch(RB_Dir) /* / deflects direction of RollBall */
{
case RIGHT:
RB_Dir=UP; break;
case UP:
RB_Dir=RIGHT; break;
case LEFT:
RB_Dir=DOWN; break;
case DOWN:
RB_Dir=LEFT; break;
} /* Remove deflector */
RB_Array[x][y]=RB_EMPTY;
DosBeep(600,20);
break;
}
case RB_BP: /* We got a point */
case RB_GP:
case RB_MP:
case RB_VP:
{ /* Add the points for each symbol */
RB_Point[0]+=RB_Point[Symbol];
/* Remove the point */
RB_Array[x][y]=RB_EMPTY;
if (ulDelay)
ulDelay--;
DosBeep(700,20);
break;
}
case RB_HOLE: /* We got a hole, sorry but RollBall will be killed.
We disable RollBall from rolling, and send a
ID_STOPTHREAD message to our window, which
informs the user about the points with a message
box */
{
int freq;
for(freq=5000;freq>100;freq-=100) DosBeep(freq,5);
runRB=FALSE; /* Prevent RollBall from further rolling */
WinPostMsg(hwndClient,WM_COMMAND,(MPARAM)ID_STOPTHREAD,(MPARAM)0);
break;
}
}
/* Randomly add and remove symbols on playing ground */
if((rand()%500)<2)
{
Put_Random_Field();
Clear_Random_Field();
}
}
}
}
DosOpen("TIMER0$",
&hfile,
&ulAction,
0,
0,
OPEN_ACTION_OPEN_IF_EXISTS,
OPEN_FLAGS_FAIL_ON_ERROR | OPEN_SHARE_DENYNONE | OPEN_ACCESS_READWRITE,
NULL);
ulDelay2=ulDelay/2;
DosDevIOCtl(hfile,
HRT_IOCTL_CATEGORY,
HRT_BLOCKUNTIL,
&ulDelay2,
ulSize2,
&ulSize2,
NULL,
0,
NULL);
DosClose(hfile);
}
WinReleasePS(hpsDT); /* Clean up */
WinDestroyMsgQueue(hmqDT);
WinTerminate(habDT);
DosExit(EXIT_THREAD,0UL);
}
int Game_Main(void *parms, int num_parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!
int index; // looping var
// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || KEY_DOWN(VK_SPACE))
PostMessage(main_window_handle, WM_DESTROY,0,0);
// start the timing clock
Start_Clock();
// clear the drawing surface
DDraw_Fill_Surface(lpddsback, 0);
// get the input from the mouse
lpdimouse->GetDeviceState(sizeof(DIMOUSESTATE), (LPVOID)&mouse_state);
// move the mouse cursor
mouse_x+=(mouse_state.lX);
mouse_y+=(mouse_state.lY);
// test bounds
// first x boundaries
if (mouse_x >= screen_width)
mouse_x = screen_width-1;
else
if (mouse_x < 0)
mouse_x = 0;
// now the y boundaries
if (mouse_y >= screen_height)
mouse_y= screen_height-1;
else
if (mouse_y < 0)
mouse_y = 0;
// position the pointer bob to the mouse coords
pointer.x = mouse_x - 16;
pointer.y = mouse_y - 16;
// test what the user is doing with the mouse
if ((mouse_x > 3) && (mouse_x < 500-3) &&
(mouse_y > 3) && (mouse_y < SCREEN_HEIGHT-3))
{
// mouse is within canvas region
// if left button is down then draw
if (mouse_state.rgbButtons[0])
{
// test drawing mode
if (buttons_state[BUTTON_PENCIL])
{
// draw a pixel
Draw_Pixel(mouse_x, mouse_y, mouse_color, canvas.buffer, canvas.width);
Draw_Pixel(mouse_x+1, mouse_y, mouse_color, canvas.buffer, canvas.width);
Draw_Pixel(mouse_x, mouse_y+1, mouse_color, canvas.buffer, canvas.width);
Draw_Pixel(mouse_x+1, mouse_y+1, mouse_color, canvas.buffer, canvas.width);
}
else
{
// draw spray
for (index=0; index<10; index++)
{
// get next particle
int sx=mouse_x-8+rand()%16;
int sy=mouse_y-8+rand()%16;
// make sure particle is in bounds
if (sx > 0 && sx < 500 && sy > 0 && sy < screen_height)
Draw_Pixel(sx, sy, mouse_color, canvas.buffer, canvas.width);
} // end for index
} // end else
} // end if left button
else // right button is eraser
if (mouse_state.rgbButtons[1])
{
// test drawing mode
if (buttons_state[BUTTON_PENCIL])
{
// erase a pixel
Draw_Pixel(mouse_x, mouse_y, 0, canvas.buffer, canvas.width);
Draw_Pixel(mouse_x+1, mouse_y, 0, canvas.buffer, canvas.width);
Draw_Pixel(mouse_x, mouse_y+1, 0, canvas.buffer, canvas.width);
Draw_Pixel(mouse_x+1, mouse_y+1, 0, canvas.buffer, canvas.width);
} // end if
else
{
// erase spray
for (index=0; index<20; index++)
{
// get next particle
int sx=mouse_x-8+rand()%16;
int sy=mouse_y-8+rand()%16;
// make sure particle is in bounds
if (sx > 0 && sx < 500 && sy > 0 && sy < screen_height)
Draw_Pixel(sx, sy, 0, canvas.buffer, canvas.width);
} // end for index
} // end else
} // end if left button
} // end if
else
if ( (mouse_x > 500+16) && (mouse_x < 500+16+8*9) &&
(mouse_y > 8) && (mouse_y < 8+32*9))
{
// within palette
// test if button left button is down
if (mouse_state.rgbButtons[0])
{
// see what color cell user is pointing to
int cell_x = (mouse_x - (500+16))/9;
int cell_y = (mouse_y - (8))/9;
// change color
mouse_color = cell_x + cell_y*8;
} // end if
} // end if
else
if ((mouse_x > 500) && (mouse_x < (500+100)) &&
(mouse_y > 344) && (mouse_y < (383+34)) )
{
// within button area
// test for each button
for (index=0; index<4; index++)
{
if ((mouse_x > buttons_x[index]) && (mouse_x < (buttons_x[index]+32)) &&
(mouse_y > buttons_y[index]) && (mouse_y < (buttons_y[index]+34)) )
break;
} // end for
// at this point we know where the user is, now determine what he
// is doing with the buttons
switch(index)
{
case BUTTON_SPRAY:
{
// if left button is down simply activate spray mode
if (mouse_state.rgbButtons[0])
{
// depress button
buttons_state[index] = 1;
// de-activate pencil mode
buttons_state[BUTTON_PENCIL] = 0;
} // end if
else
{
// make sure button is up
// buttons_state[index] = 0;
} // end else
} break;
case BUTTON_PENCIL:
{
// if left button is down activate spray mode
if (mouse_state.rgbButtons[0])
{
// depress button
buttons_state[index] = 1;
// de-activate spray mode
buttons_state[BUTTON_SPRAY] = 0;
} // end if
else
{
// make sure button is up
// buttons_state[index] = 0;
} // end else
} break;
case BUTTON_ERASE:
{
// test if left button is down, if so clear screen
if (mouse_state.rgbButtons[0])
{
// clear memory
memset(canvas.buffer,0,canvas.width*canvas.height);
// depress button
buttons_state[index] = 1;
} // end if
else
{
// make sure button is up
buttons_state[index] = 0;
} // end else
} break;
case BUTTON_EXIT:
{
// test if left button down, if so bail
if (mouse_state.rgbButtons[0])
PostMessage(main_window_handle, WM_DESTROY,0,0);
} break;
} // end switch
} // end if
else
{
// no mans land
} // end else
// lock back buffer
DDraw_Lock_Back_Surface();
// draw the canvas
Draw_Bitmap(&canvas, back_buffer, back_lpitch,0);
// draw control panel
Draw_Bitmap(&cpanel,back_buffer,back_lpitch,0);
// unlock back buffer
DDraw_Unlock_Back_Surface();
// draw the color palette
for (int col=0; col < 256; col++)
{
Draw_Rectangle(500+16+(col%8)*9, 8+(col/8)*9,
500+16+(col%8)*9+8, 8+(col/8)*9+8,
col,lpddsback);
} // end for col
// draw the current color selected
Draw_Rectangle(533,306,533+34,306+34,mouse_color,lpddsback);
// draw the buttons
for (index=0; index<4; index++)
{
// set position of button bob
buttons.x = buttons_x[index];
buttons.y = buttons_y[index];
// now select the on/off frame based on if the
// button is off
if (buttons_state[index]==0)
buttons.curr_frame = index;
else // button is on
buttons.curr_frame = index+4;
// draw the button
Draw_BOB(&buttons, lpddsback);
} // end for index
static int green = 0;
// display coords
sprintf(buffer,"Pointer (%d,%d)",mouse_x,mouse_y);
Draw_Text_GDI(buffer, 8,screen_height - 16,RGB(0,255,0),lpddsback);
Draw_Text_GDI("T3D Paint Version 2.0 - Press <ESC> to Exit.",0,0,RGB(0,(green & 255),0),lpddsback);
// a little animation
++green;
// draw the cursor last
Draw_BOB(&pointer,lpddsback);
// flip the surfaces
DDraw_Flip();
// sync to 30 fps
Wait_Clock(30);
// return success
return(1);
} // end Game_Main
int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!
int index; // looping var
static int curr_angle = 0; // current angle of elevation from horizon
static float curr_vel = 10; // current velocity of projectile
// start the timing clock
Start_Clock();
// clear the drawing surface
//DDraw_Fill_Surface(lpddsback, 0);
// lock back buffer and copy background into it
DDraw_Lock_Back_Surface();
// draw background
Draw_Bitmap(&background_bmp, back_buffer, back_lpitch,0);
// do the graphics
Draw_Polygon2D(&cannon, back_buffer, back_lpitch);
// unlock back surface
DDraw_Unlock_Back_Surface();
// read keyboard
DInput_Read_Keyboard();
// test for rotate
if ((curr_angle < 90) && keyboard_state[DIK_UP]) // rotate left
{
Rotate_Polygon2D_Mat(&cannon, -5);
curr_angle+=5;
} // end if
else
if ((curr_angle > 0) &&keyboard_state[DIK_DOWN]) // rotate right
{
Rotate_Polygon2D_Mat(&cannon, 5);
curr_angle-=5;
} // end if
// test for projectile velocity
if (keyboard_state[DIK_RIGHT])
{
if (curr_vel < 30) curr_vel+=0.1;
} // end if
else
if (keyboard_state[DIK_LEFT])
{
if (curr_vel > 0) curr_vel-=0.1;
} // end if
// test for wind force
if (keyboard_state[DIK_W])
{
if (wind_force < 2) wind_force+=0.01;
} // end if
else
if (keyboard_state[DIK_E])
{
if (wind_force > -2) wind_force-=0.01;
} // end if
// test for gravity force
if (keyboard_state[DIK_G])
{
if (gravity_force < 15) gravity_force+=0.1;
} // end if
else
if (keyboard_state[DIK_B])
{
if (gravity_force > -15) gravity_force-=0.1;
} // end if
// test for fire!
if (keyboard_state[DIK_LCONTROL])
{
Fire_Projectile(curr_angle, curr_vel);
} // end fire
// move all the projectiles
Move_Projectiles();
// draw the projectiles
Draw_Projectiles();
// draw the title
Draw_Text_GDI("Trajectory DEMO, Press <ESC> to Exit.",10, 10,RGB(255,255,255), lpddsback);
Draw_Text_GDI("<RIGHT>, <LEFT> to adjust velocity, <UP>, <DOWN> to adjust angle",10, 25, RGB(255,255,255), lpddsback);
Draw_Text_GDI("<G>, <B> to adjust gravity, <W>, <E> to adjust wind, <CTRL> to fire.",10, 40, RGB(255,255,255), lpddsback);
sprintf(buffer, "Ang=%d, Vel=%f", curr_angle, curr_vel);
Draw_Text_GDI(buffer,10, 60, RGB(255,255,255), lpddsback);
sprintf(buffer, "Wind force=%f, Gravity Force=%f", wind_force, gravity_force);
Draw_Text_GDI(buffer,10, 75, RGB(255,255,255), lpddsback);
// flip the surfaces
DDraw_Flip();
// sync to 30 fps = 1/30sec = 33 ms
Wait_Clock(33);
// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || keyboard_state[DIK_ESCAPE])
{
PostMessage(main_window_handle, WM_DESTROY,0,0);
// stop all sounds
DSound_Stop_All_Sounds();
// do a screen transition
Screen_Transitions(SCREEN_DARKNESS,NULL,0);
} // end if
// return success
return(1);
} // end Game_Main
int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!
int index; // looping var
int dx,dy; // general deltas used in collision detection
// start the timing clock
Start_Clock();
// clear the drawing surface
DDraw_Fill_Surface(lpddsback, 0);
// get the joystick data
DInput_Read_Joystick();
// lock the back buffer
DDraw_Lock_Back_Surface();
// draw the background reactor image
Draw_Bitmap(&playfield, back_buffer, back_lpitch, 0);
// unlock the back buffer
DDraw_Unlock_Back_Surface();
// is the player moving?
blaster.x+=joy_state.lX;
blaster.y+=joy_state.lY;
// test bounds
if (blaster.x > SCREEN_WIDTH-32)
blaster.x = SCREEN_WIDTH-32;
else
if (blaster.x < 0)
blaster.x = 0;
if (blaster.y > SCREEN_HEIGHT-32)
blaster.y = SCREEN_HEIGHT-32;
else
if (blaster.y < SCREEN_HEIGHT-128)
blaster.y = SCREEN_HEIGHT-128;
// is player firing?
if (joy_state.rgbButtons[0])
Start_Missile();
// move and draw missle
Move_Missile();
Draw_Missile();
// is it time to blink eyes
if ((rand()%100)==50)
Set_Animation_BOB(&blaster,0);
// draw blaster
Animate_BOB(&blaster);
Draw_BOB(&blaster,lpddsback);
// draw some text
Draw_Text_GDI("Make My Centipede!",0,0,RGB(255,255,255),lpddsback);
// display joystick and buttons 0-7
sprintf(buffer,"Joystick Stats: X-Axis=%d, Y-Axis=%d, buttons(%d,%d,%d,%d,%d,%d,%d,%d)",
joy_state.lX,joy_state.lY,
joy_state.rgbButtons[0],
joy_state.rgbButtons[1],
joy_state.rgbButtons[2],
joy_state.rgbButtons[3],
joy_state.rgbButtons[4],
joy_state.rgbButtons[5],
joy_state.rgbButtons[6],
joy_state.rgbButtons[7]);
Draw_Text_GDI(buffer,0,SCREEN_HEIGHT-20,RGB(255,255,50),lpddsback);
// print out name of joystick
sprintf(buffer, "Joystick Name & Vendor: %s",joyname);
Draw_Text_GDI(buffer,0,SCREEN_HEIGHT-40,RGB(255,255,50),lpddsback);
// flip the surfaces
DDraw_Flip();
// sync to 30 fps
Wait_Clock(30);
// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || keyboard_state[DIK_ESCAPE])
{
PostMessage(main_window_handle, WM_DESTROY,0,0);
} // end if
// return success
return(1);
} // end Game_Main
int Game_Init(void *parms)
{
// this function is where you do all the initialization
// for your game
int index; // looping var
// start up DirectDraw (replace the parms as you desire)
DDraw_Init(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_BPP, WINDOWED_APP);
// initialize directinput
DInput_Init();
// acquire the keyboard
DInput_Init_Keyboard();
// initialize the joystick
DInput_Init_Joystick(-24,24,-24,24);
// initialize directsound and directmusic
DSound_Init();
DMusic_Init();
// hide the mouse
ShowCursor(FALSE);
// seed random number generator
srand(Start_Clock());
// load the background
Load_Bitmap_File(&bitmap8bit, "MUSH.BMP");
// set the palette to background image palette
Set_Palette(bitmap8bit.palette);
// load in the four frames of the mushroom
for (index=0; index<4; index++)
{
// create mushroom bitmaps
Create_Bitmap(&mushrooms[index],0,0,32,32);
Load_Image_Bitmap(&mushrooms[index],&bitmap8bit,index,0,BITMAP_EXTRACT_MODE_CELL);
} // end for index
// now create the bug blaster bob
Create_BOB(&blaster,0,0,32,32,3,
BOB_ATTR_VISIBLE | BOB_ATTR_MULTI_ANIM | BOB_ATTR_ANIM_ONE_SHOT,
DDSCAPS_SYSTEMMEMORY);
// load in the four frames of the mushroom
for (index=0; index<3; index++)
Load_Frame_BOB(&blaster,&bitmap8bit,index,index,1,BITMAP_EXTRACT_MODE_CELL);
// unload the bitmap file
Unload_Bitmap_File(&bitmap8bit);
// set the animation sequences for bug blaster
Load_Animation_BOB(&blaster,0,5,blaster_anim);
// set up stating state of bug blaster
Set_Pos_BOB(&blaster,320, 400);
Set_Anim_Speed_BOB(&blaster,3);
// set clipping rectangle to screen extents so objects dont
// mess up at edges
RECT screen_rect = {0,0,screen_width,screen_height};
lpddclipper = DDraw_Attach_Clipper(lpddsback,1,&screen_rect);
// create mushroom playfield bitmap
Create_Bitmap(&playfield,0,0,SCREEN_WIDTH,SCREEN_HEIGHT);
playfield.attr |= BITMAP_ATTR_LOADED;
// fill in the background
Load_Bitmap_File(&bitmap8bit, "GRASS.BMP");
// load the grass bitmap image
Load_Image_Bitmap(&playfield,&bitmap8bit,0,0,BITMAP_EXTRACT_MODE_ABS);
Unload_Bitmap_File(&bitmap8bit);
// create the random mushroom patch
for (index=0; index<50; index++)
{
// select a mushroom
int mush = rand()%4;
// set mushroom to random position
mushrooms[mush].x = rand()%(SCREEN_WIDTH-32);
mushrooms[mush].y = rand()%(SCREEN_HEIGHT-128);
// now draw the mushroom into playfield
Draw_Bitmap(&mushrooms[mush], playfield.buffer, playfield.width,1);
} // end for
// return success
return(1);
} // end Game_Init
int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!
int index; // looping var
// start the timing clock
Start_Clock();
// clear the drawing surface
DDraw_Fill_Surface(lpddsback, 0);
// lock back buffer and copy background into it
DDraw_Lock_Back_Surface();
// draw background
Draw_Bitmap(&background_bmp, back_buffer, back_lpitch,0);
// unlock back surface
DDraw_Unlock_Back_Surface();
// read keyboard
DInput_Read_Keyboard();
// check the player controls
// is the player turning right or left?
if (keyboard_state[DIK_RIGHT])
{
// there are 16 possible positions for the ship to point in
if (++ship.varsI[0] >= 16)
ship.varsI[0] = 0;
} // end if
else
if (keyboard_state[DIK_LEFT])
{
// there are 16 possible positions for the ship to point in
if (--ship.varsI[0] < 0)
ship.varsI[0] = 15;
} // end if
// now test for forward thrust
if (keyboard_state[DIK_UP])
{
// thrust ship in current direction
float rad_angle = (float)ship.varsI[0]*(float)3.14159/(float)8;
float xv = cos(rad_angle);
float yv = sin(rad_angle);
ship.varsF[0]+=xv;
ship.varsF[1]+=yv;
// animate the ship
ship.curr_frame = ship.varsI[0]+16*(rand()%2);
} // end if
else // show non thrust version
ship.curr_frame = ship.varsI[0];
// move ship
ship.varsF[2]+=ship.varsF[0];
ship.varsF[3]+=ship.varsF[1];
// always apply friction in direction opposite current trajectory
float fx = -ship.varsF[0];
float fy = -ship.varsF[1];
float length_f = sqrt(fx*fx+fy*fy); // normally we would avoid square root at all costs!
// compute the frictional resitance
if (fabs(length_f) > 0.1)
{
fx = FRICTION_FACTOR*fx/length_f;
fy = FRICTION_FACTOR*fy/length_f;
} // end if
else
fx=fy=0;
// now apply friction to forward velocity
ship.varsF[0]+=fx;
ship.varsF[1]+=fy;
////////////////////////////////////////////////////////////////////
// gravity calculation section
// step 1: compute vector from black hole to ship, note that the centers
// of each object are used
float grav_x = (black_hole.x + black_hole.width/2) - (ship.x + ship.width/2);
float grav_y = (black_hole.y + black_hole.height/2) - (ship.y + ship.height/2);
float radius_squared = grav_x*grav_x + grav_y*grav_y; // equal to radius squared
float length_grav = sqrt(radius_squared);
// step 2: normalize the length of the vector to 1.0
grav_x = grav_x/length_grav;
grav_y = grav_y/length_grav;
// step 3: compute the gravity force
float grav_force = (VIRTUAL_GRAVITY_CONSTANT) * (SHIP_MASS * BLACK_HOLE_MASS) / radius_squared;
// step 4: apply gforce in the direction of grav_x, grav_y with the magnitude of grav_force
ship.varsF[0]+=grav_x*grav_force;
ship.varsF[1]+=grav_y*grav_force;
////////////////////////////////////////////////////////////////////
// test if ship is off screen
if (ship.varsF[2] > SCREEN_WIDTH)
ship.varsF[2] = -ship.width;
else
if (ship.varsF[2] < -ship.width)
ship.varsF[2] = SCREEN_WIDTH;
if (ship.varsF[3] > SCREEN_HEIGHT)
ship.varsF[3] = -ship.height;
else
if (ship.varsF[3] < -ship.height)
ship.varsF[3] = SCREEN_HEIGHT;
// test if velocity is insane
if ( (ship.varsF[0]*ship.varsF[0] + ship.varsF[1]*ship.varsF[1]) > MAX_VEL)
{
// scale velocity down
ship.varsF[0]*=.95;
ship.varsF[1]*=.95;
} // end if
// animate the black hole
Animate_BOB(&black_hole);
// draw the black hole
Draw_BOB(&black_hole, lpddsback);
// copy floating point position to bob x,y
ship.x = ship.varsF[2];
ship.y = ship.varsF[3];
// draw the ship
Draw_BOB(&ship,lpddsback);
// draw the title
Draw_Text_GDI("GRAVITY MASS DEMO - Use Arrows to Control Ship.",10, 10,RGB(0,255,255), lpddsback);
sprintf(buffer,"Friction: X=%f, Y=%f",fx, fy);
Draw_Text_GDI(buffer,10,420,RGB(0,255,0), lpddsback);
sprintf(buffer,"Velocity: X=%f, Y=%f",ship.varsF[0], ship.varsF[1]);
Draw_Text_GDI(buffer,10,440,RGB(0,255,0), lpddsback);
sprintf(buffer,"Gravity: X=%f, Y=%f",ship.varsF[2], ship.varsF[3]);
Draw_Text_GDI(buffer,10,460,RGB(0,255,0), lpddsback);
// flip the surfaces
DDraw_Flip();
// sync to 30 fps = 1/30sec = 33 ms
Wait_Clock(33);
// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || keyboard_state[DIK_ESCAPE])
{
PostMessage(main_window_handle, WM_DESTROY,0,0);
// stop all sounds
DSound_Stop_All_Sounds();
// do a screen transition
Screen_Transitions(SCREEN_DARKNESS,NULL,0);
} // end if
// return success
return(1);
} // end Game_Main
