borgware-2d/games/kart/kart.c

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2014-02-11 20:01:10 +00:00
/*
* kart.c
*
* Created on: 07.02.2014
* Author: Stefan Kinzel
*/
#include <assert.h>
#include <stdint.h>
#include "../../config.h"
#include "../../compat/pgmspace.h"
#include "../../pixel.h"
#include "../../random/prng.h"
#include "../../util.h"
#include "../../joystick/joystick.h"
#include "../../menu/menu.h"
#include "../../scrolltext/scrolltext.h"
#include "kart.h"
#include <stdio.h>
#if defined MENU_SUPPORT && defined GAME_KART
// icon (TODO: convert to hex)
static const uint8_t icon[8] PROGMEM =
{ 0b11100001,
0b11100001,
0b11000011,
0b10000111,
0b10000111,
0b11000011,
0b11000011,
0b10010111};
game_descriptor_t kart_game_descriptor __attribute__((section(".game_descriptors"))) =
{
&kart_game,
icon,
};
#endif
#define WAIT 75
#define DRIVEDIV 3
#define MOVEDIV 1
#define DECREASE_WIDTH_DIV 120
#define CARCOLOR 3
#define BORDERCOLOR 2
#define LINECOLOR 1
#define CURVE_PROP 30
uint8_t borders[NUM_ROWS][2];
void kart_game(){
// Initialisation
uint8_t carpos = NUM_COLS / 2;
uint32_t cycle = 0;
uint8_t draw_line = 1;
uint8_t width = NUM_COLS -2;
uint8_t middle = NUM_COLS / 2;
char game_over[100] = "";
clear_screen(0);
// init border memory
for(uint8_t row = 0; row < NUM_ROWS; row++){
borders[row][0] = middle;
borders[row][1] = width;
}
setpixel((pixel){carpos, NUM_ROWS-1}, CARCOLOR);
// Wait some seconds to start...
while(1){
cycle++;
wait(WAIT);
if(cycle >= DRIVEDIV*0){
break;
}
}
// main loop
while(1){
// DECREASE WIDTH
if(cycle % DECREASE_WIDTH_DIV == 0){
width--;
}
// MOVE-STEP
if(cycle % MOVEDIV == 0){
if (JOYISLEFT){
carpos++;
setpixel((pixel){carpos, NUM_ROWS-1}, 0);
}else if (JOYISRIGHT){
carpos--;
setpixel((pixel){carpos, NUM_ROWS-1}, 0);
}
if(check_collision(carpos)){
break;
}
}
// DRIVE-STEP
if(cycle % DRIVEDIV == 0){
// generate a route
int rnd = random8();
if(rnd < CURVE_PROP && middle-(width/2) > 1){
middle--;
}else if(rnd > 256-CURVE_PROP && middle+(width/2) < NUM_COLS-1){
middle++;
}
// shift pixmap down
drive();
// save border state
save_borders(middle, width);
// draw new first line
unsigned int px;
for(px=0; px < NUM_COLS; px++){
if(px<middle-(width/2) || px >= middle+(width/2)){
setpixel((pixel){px, 0}, BORDERCOLOR);
}
}
}
// toggle drawing the middle line
if(cycle % (DRIVEDIV*4) == 0){
draw_line = 1-draw_line;
}
// paint middle line
if(width > 4 && draw_line){
setpixel((pixel){middle, 0}, LINECOLOR);
}
// Paint car
setpixel((pixel){carpos, NUM_ROWS-1}, CARCOLOR);
cycle++;
wait(WAIT);
}
snprintf(game_over, sizeof(game_over), "</#Game Over, Score: %i", cycle);
scrolltext(game_over);
}
/**
* Shifts the Pixmap one px down
*/
void drive(void){
unsigned char plane, row;
for(plane=0; plane<NUMPLANE; plane++){
for(row=NUM_ROWS-1;row>0; row--){
pixmap[plane][row][0] = pixmap[plane][row-1][0];
pixmap[plane][row][1] = pixmap[plane][row-1][1];
}
pixmap[plane][0][0] = 0x00;
pixmap[plane][0][1] = 0x00;
}
}
/**
* Save the border state at the top line, so collision detection can
* work in the last line (where the car is).
*/
void save_borders(uint8_t middle, uint8_t width){
uint8_t row;
for(row = NUM_ROWS-1; row > 0 ; row--){
borders[row][0] = borders[row-1][0];
borders[row][1] = borders[row-1][1];
}
borders[0][0] = middle;
borders[0][1] = width;
}
/**
* check if collision occours
*/
uint8_t check_collision(uint8_t carpos){
uint8_t middle = borders[NUM_ROWS-1][0];
uint8_t width = borders[NUM_ROWS-1][1];
return ( carpos<middle-(width/2) || carpos >= middle+(width/2) );
}