/* Increment the score by the specifed amount and redraw the score bar: */
void increment_score(nbstate *state, int points)
{
state->scores.s += points; /* Increment the current score. */
draw_scores(state); /* Redraw the score bar onto the canvas. */
/* Copy the bar onto the output window. */
draw_canvas(state, 0, 0, state->canvaswidth, state->scores.h);
}
/* Called whenever a ball is lost, either by it falling off the bottom of the
* screen, or the player pressing the "suicide key". */
void lost_ball(nbstate *state)
{
/* Decrement the balls count and if there are none left: */
if(!state->numballs--) {
/* Go to the "game lost" state and update the high score if
* appropriate: */
state->state = STATE_GAMELOST;
/* Update the high score and save it if necessary: */
save_hiscore(state);
/* This could probably be done better by just drawing the
* splash- set_level_active() redraws the entire game area: */
set_level_active(state);
return;
}
/* Erase the balls line at the top of the screen: */
draw_background(state, 0, state->scores.h, state->canvaswidth,
state->ball.s->h + (BALLS_BORDER * 2));
/* Draw the balls again, but with one less than there was before: */
draw_balls(state);
/* Copy the balls row to the output window: */
draw_canvas(state, 0, state->scores.h, state->canvaswidth,
state->ball.s->h + (BALLS_BORDER * 2));
/* Park the new ball and erase the old one: */
park_ball(state);
move_ball(state);
/* Redraw the bat. This is a bit of a hack because sometimes when the
* ball falls below the top of the bat on its way to the bottom of the
* screen it can clip the bat and erase a bit of it. This redraws the
* bat to hide that: */
draw_bat(state);
/* Copy the redrawn bat to the output window: */
draw_canvas(state, state->batx - (state->batwidths[state->bat] / 2),
state->canvasheight - state->batheight,
state->batwidths[state->bat], state->batheight);
}
/* Redraw the ball in its current position, including copying it to the output
* window. */
void redraw_ball(nbstate *state)
{
/* Erase the ball area to the background: */
draw_background(state, (int)state->ball.x, (int)state->ball.y,
state->ball.s->w, state->ball.s->h);
/* Redraw any powers we may have erased: */
redraw_powers(state, (int)state->ball.x, (int)state->ball.y,
state->ball.s->w, state->ball.s->h);
/* Redraw the ball: */
draw_ball(state);
/* Copy it to the output window: */
draw_canvas(state, state->ball.lx, state->ball.ly, state->ball.s->w,
state->ball.s->h);
}
/* Destroy the specified brick, clear the relevant piece of the game area,
* increment the score by the appropriate amount, decrement the current
* number of bricks, and if we run out of bricks, increment to the next level.
* Returns 0 if the level wasn't incremented and 1 if it was. */
static int destroy_brick(nbstate *state, grid *g)
{
int immutable;
/* Wipe the canvas where the brick is back to the background: */
draw_background(state, g->x, g->y, state->brickwidth,
state->brickheight);
/* Redraw any powers we may just have accidentally erased: */
redraw_powers(state, g->x, g->y, state->brickwidth, state->brickheight);
/* Copy the affected area to the output window: */
draw_canvas(state, g->x, g->y, state->brickwidth,
state->brickheight);
/* Increment the score by the appropriate amount: */
if(g->b->flags & BRICK_FLAG_HUGE_BONUS)
increment_score(state, state->hugebonuspoints);
else if(g->b->flags & BRICK_FLAG_LARGE_BONUS)
increment_score(state, state->largebonuspoints);
else if(g->b->flags & BRICK_FLAG_MEDIUM_BONUS)
increment_score(state, state->mediumbonuspoints);
else if(g->b->flags & BRICK_FLAG_SMALL_BONUS)
increment_score(state, state->smallbonuspoints);
else increment_score(state, state->normalpoints);
/* Remember whether this was an immutable brick (which does not factor
* when counting the number of bricks remaining because it cannot
* normally be destroyed- only the PowerBall power-up and the
* NoBounce cheat can cause immutable bricks to be destroyed. */
immutable = g->b->flags & BRICK_FLAG_IMMUTABLE;
g->b = 0; /* Wipe the brick from this grid location. */
/* If this wasn't an immutable brick, decrement the current count of
* bricks and if we run out, increment to the next level and return. */
if(!immutable && !--state->numbricks) {
increment_level(state);
return 1; /* Level was incremented. */
}
/* Create the power-up or power-down (if any): */
if(g->power != NOPOWER)
new_power(state, g->power, g->x + (state->brickwidth / 2),
g->y);
return 0; /* Level wasn't incremented. */
}
/* Move the ball to from the position specified by state->ball.lx and
* state->ball.ly to state->ball.x and state->ball.y, and update the relevant
* area of the output window. */
void move_ball(nbstate *state)
{
int x, w, y, h;
/* Check that the ball really has moved: */
if(state->ball.lx == state->ball.x && state->ball.ly == state->ball.y)
return;
/* Calculate the position and dimensions of the rectangle which
* encloses both the old ball and the new ball so we know what area
* to copy to the output window later. FIXME: this is quite inefficient
* when doing stuff like parking the ball, where the old ball position
* could be at the other side of the screen to the place we want to
* move it to. It is however OK in the common case of only moving the
* ball a few pixels at a time. */
if(state->ball.x < state->ball.lx) {
x = (int)state->ball.x;
w = state->ball.lx - x + state->ball.s->w;
} else {
x = state->ball.lx;
w = (int)state->ball.x - x + state->ball.s->w;
}
if(state->ball.y < state->ball.ly) {
y = (int)state->ball.y;
h = state->ball.ly - y + state->ball.s->h;
} else {
y = state->ball.ly;
h = (int)state->ball.y - y + state->ball.s->h;
}
/* Draw the background where the old ball image is to erase it: */
draw_background(state, state->ball.lx, state->ball.ly,
state->ball.s->w, state->ball.s->h);
/* Redraw any powers that are under that position: */
redraw_powers(state, state->ball.lx, state->ball.ly, state->ball.s->w,
state->ball.s->h);
/* Draw the ball in the new position and update ball.lx and ball.ly: */
draw_ball(state);
/* Draw the modified area of the canvas to the output window: */
draw_canvas(state, x, y, w, h);
}
/* Called from destroy_brick() to create a new power box of the specified type
* centred on the specified location. */
void new_power(nbstate *state, int type, int x, int y)
{
power *p, *pn;
sprite *s = state->powersprites[type];
/* Allocate the new power structure: */
if(!(p = malloc(sizeof(power)))) {
oom();
return;
}
/* Fill in the parameters: */
p->type = type;
p->y = y;
/* Calculate the left hand coordinate of the power box (the passed in
* X coordinate specifies the centre, not the actual position): */
p->x = x - (s->w / 2);
/* Shift the box left or right if needed to make sure it is fully on
* the screen: */
if(p->x < 0) p->x = 0;
if(p->x + s->w > state->canvaswidth)
p->x = state->canvaswidth - s->w;
p->next = NULL; /* This is the last in the list so there is no next. */
/* If the list is empty, make this power the head of the list: */
if(!state->powers) state->powers = p;
else {
/* Otherwise loop through until the end of the list: */
for(pn = state->powers; pn->next; pn = pn->next);
pn->next = p; /* Tag this power onto the end of the list. */
}
/* Draw the new power: */
draw_power(state, p, p->x, p->y, s->w, s->h);
/* Draw the modified area of the canvas to the output window: */
draw_canvas(state, p->x, p->y, s->w, s->h);
}
/* Called whenever the ball collides with a brick, and handles such things as
* destroying the brick if appropriate, redrawing it with more transparency
* if appropriate, incrementing to the next level when we destroy the last brick
* (actually, that's done by destroy_brick() which is called from
* brick_collision()), etc. Returns 0 if the level was not incremented and 1
* if it was. */
int brick_collision(nbstate *state, grid *g)
{
/* If either the PowerBall power-up or the NoBounce cheat is active,
* simply destroy the brick in one hit even if it is immutable. */
if(state->powertimes.powerball || state->flags.nb)
return destroy_brick(state, g);
/* If this is an immutable brick and PowerBall and NoBounce are not
* active, it can't be destroyed so return normally: */
if(g->b->flags & BRICK_FLAG_IMMUTABLE) return 0;
/* Increment the number of hits on this brick. This is used to keep
* track of when to destroy a "2 hits or "3 hits" brick, and also how
* transparent to draw those bricks as: */
g->hits++;
/* If this is a 2-hit brick and it has only been hit once or it is a
* 3 hit brick that has been hit either once or twice: */
if(((g->b->flags & BRICK_FLAG_2_HITS) && g->hits < 2) ||
((g->b->flags & BRICK_FLAG_3_HITS) && g->hits < 3)) {
/* Clear the area where the brick is: */
draw_background(state, g->x, g->y, state->brickwidth,
state->brickheight);
/* Redraw the brick (with additional transparency to indicate
* that it has been hit): */
draw_brick(state, g, 0, 0, state->brickwidth,
state->brickheight);
/* Redraw any powers we may just have accidentally erased: */
redraw_powers(state, g->x, g->y, state->brickwidth,
state->brickheight);
/* Copy the changed area to the output window: */
draw_canvas(state, g->x, g->y, state->brickwidth,
state->brickheight);
/* Otherwise, destroy the brick: */
} else return destroy_brick(state, g);
return 0; /* Level was not incremented. */
}
/* Because the canvas is a full double buffer, all we need to do when we get
* an exposure event is to copy the specified area of the canvas to the
* output window. */
void handle_exposure_event(nbstate *state, GR_EVENT_EXPOSURE *ev)
{
draw_canvas(state, ev->x, ev->y, ev->width, ev->height);
}
/* Called every animation frame to move all of the power boxes down and perform
* collision detection, etc. Doesn't draw the results to the canvas unless the
* power collides with something and is destroyed. */
void animate_powers(nbstate *state)
{
sprite *s;
power *p, *pnext;
/* For each power in the list: */
for(p = state->powers; p; p = pnext) {
/* Remember the next item first, because we may destroy this
* power, and then it would be wrong to use the pointer to
* find the pointer to the next one in the list: */
pnext = p->next;
/* Find the sprite for this power type: */
s = state->powersprites[p->type];
/* Clear the old power away: */
draw_background(state, p->x, p->y, s->w, s->h);
/* Redraw any bricks we may have accidentally erased: */
draw_bricks(state, p->x, p->y, s->w, s->h);
/* Move it down: */
p->y += state->powerv;
/* If it has reached the bottom of the screen: */
if(p->y + s->h > state->canvasheight) {
/* Copy the erased region to the screen: */
draw_canvas(state, p->x, p->y - state->powerv,
s->w, s->h);
/* Destroy the power structure: */
destroy_power(state, p);
/* Check if it will collide with the bat: */
} else if(p->y + s->h > state->canvasheight - state->batheight
&& p->x + s->w > state->batx -
(state->batwidths[state->bat] / 2) &&
p->x < state->batx +
(state->batwidths[state->bat] / 2)) {
/* Copy the erased region to the screen: */
draw_canvas(state, p->x, p->y - state->powerv,
s->w, s->h);
/* Activate the relevant power: */
power_collision(state, p);
/* Destroy the power structure: */
destroy_power(state, p);
} else {
/* Redraw it in its new location: */
draw_power(state, p, p->x, p->y, s->w, s->h);
}
}
/* Redraw the ball in case we accidentally drew over it: */
redraw_ball(state);
/* Copy all the modified areas to the output window: */
for(p = state->powers; p; p = p->next)
draw_canvas(state, p->x, p->y - state->powerv, s->w,
s->h + state->powerv);
}
/* Make the current level active. This mainly consists of destroying the old
* background image and loading the new one, destroying the splash image,
* possibly loading a new splash image depending on the state, copying over the
* new level data into the current level state, then redrawing the entire game
* area. */
void set_level_active(nbstate *state)
{
int i;
level *lev;
grid *g, *gg;
int bgchanged;
sprite *s = NULL;
power *p, *pnext;
GR_PIXMAP_ID ctmp;
char *backgroundfile;
/* Destroy the old splash image sprite: */
destroy_sprite(state, state->splash);
/* If we're on the title screen: */
if(state->state == STATE_TITLESCREEN) {
/* Set the background file to the title background file: */
backgroundfile = state->titlebackground;
/* Set the tiled state appropriately: */
state->backgroundtiled = state->titlebackgroundtiled;
/* Try to load the title screen splash graphic (if it doesn't
* work nothing bad will happen- load_sprite() will print an
* error message and draw_splash() will not draw anything.) */
state->splash = load_sprite(state, state->titlesplash, -1, -1);
} else { /* Not on the title screen. */
/* Find the level structure for the current level number: */
for(lev = state->levels, i = 1; i < state->level;
lev = lev->next, i++);
/* Set the current number of bricks and background info: */
state->numbricks = lev->numbricks;
backgroundfile = lev->backgroundname;
state->backgroundtiled = lev->backgroundtiled;
/* If we're in the "game won" state, try to load the appropriate
* splash image: */
if(state->state == STATE_GAMEWON) {
state->splash = load_sprite(state, state->gamewonsplash,
-1, -1);
/* If we're in the "game lost" state, try to load the
* appropriate splash image: */
} else if(state->state == STATE_GAMELOST) {
state->splash = load_sprite(state,
state->gamelostsplash, -1, -1);
} else { /* We must be in the STATE_RUNNING state. */
/* No splash image: */
state->splash = NULL;
/* Copy this levels game grid into the current game
* grid: */
g = state->grid;
gg = lev->grid;
for(i = 0; i < state->width * state->height; i++)
*g++ = *gg++;
}
}
/* If there was a background filename specified: */
if(backgroundfile) {
/* If there is a current background sprite with a filename
* and the filename is the same as the new background
* filename, the background file has not changed. Otherwise,
* assume that it has. */
if(state->background && state->background->fname &&
!strcmp(backgroundfile,
state->background->fname))
bgchanged = 0;
else bgchanged = 1;
/* No background filename was specified, so assume it has changed (to
* a blank black frame): */
} else bgchanged = 1;
/* If the background image has changed, try to load the new one: */
if(bgchanged && !(s = load_sprite(state, backgroundfile, -1, -1))) {
/* If it fails, try to make a new empty sprite and colour it
* in black (the 16*16 pixels is purely arbitrary- make it too
* large and it uses a lot of memory, make it too small and
* we spend ages painting hundreds of tiny tiles onto the
* background. */
if(!(s = make_empty_sprite(state, backgroundfile, 16, 16))) {
/* If that fails too (shouldn't happen under normal
* circumstances), issue a warning and keep the old
* background image sprite: */
s = state->background;
} else {
/* Fill in the new dummy background black: */
GrSetGCForeground(state->gc, GR_COLOR_BLACK);
GrFillRect(s->p, state->gc, 0, 0, 16, 16);
/* Make it tiled. FIXME: it would make more sense to
* have a "no background image" option which simply
* coloured in the background black: */
state->backgroundtiled = 1;
}
}
/* If we have made a new background image sprite: */
if(bgchanged && s != state->background) {
/* Destroy the old one: */
destroy_sprite(state, state->background);
/* Set the background to the new sprite: */
state->background = s;
}
/* Empty the list of power boxes: */
for(p = state->powers; p; p = pnext) {
pnext = p->next;
free(p);
}
state->powers = NULL;
/* If fading has been requested, we want to fade the new level in, so
* swap the canvasses around so the current screen is the old canvas,
* then draw the new screen and make the new canvas, then start the
* process of fading it in: */
if(state->faderate) {
/* Swap the canvasses around: */
ctmp = state->oldcanvas;
state->oldcanvas = state->canvas;
state->canvas = ctmp;
/* Remember the state we're fading into: */
state->nextstate = state->state;
/* Go into the fading state: */
state->state= STATE_FADING;
/* Initialise the fade level as completely opaque: */
state->fadelevel = 256;
}
/* Clear the whole game area to the background image: */
draw_background(state, 0, 0, state->canvaswidth, state->canvasheight);
/* If we're not on the title screen or fading to the title screen: */
if(state->state != STATE_TITLESCREEN && !(state->state == STATE_FADING
&& state->nextstate == STATE_TITLESCREEN)) {
/* Draw the bricks: */
draw_bricks(state, 0, 0, state->canvaswidth,
state->canvasheight);
draw_scores(state); /* Draw the scores bar. */
draw_balls(state); /* Draw the row of balls. */
draw_bat(state); /* Draw the bat. */
/* Draw the current ball unless the game is over: */
if(state->state != STATE_GAMELOST &&
state->state != STATE_GAMEWON)
draw_ball(state);
}
draw_splash(state); /* Draw the splash graphic (if there is one). */
/* If we're fading, remember the new canvas and generate the first
* frame of the fade: */
if(state->state == STATE_FADING) {
/* Swap the canvasses around: */
ctmp = state->newcanvas;
state->newcanvas = state->canvas;
state->canvas = ctmp;
/* Reduce the opacity: */
state->fadelevel -= state->faderate;
/* Generate the first frame: */
GrCopyArea(state->canvas, state->gc, 0, 0, state->canvaswidth,
state->canvasheight, state->newcanvas, 0, 0, 0);
GrCopyArea(state->canvas, state->gc, 0, 0, state->canvaswidth,
state->canvasheight, state->oldcanvas, 0, 0,
GR_CONST_BLEND | state->fadelevel);
}
/* Copy the entire redrawn canvas to the output window: */
draw_canvas(state, 0, 0, state->canvaswidth, state->canvasheight);
}