//
// printArray
// This function prints the contents of a bitarray as characters on the screen.
// Value 0 is shown as '_' for visual clarity. Other values are shown as characters
// [1, 2, 3, 4, 5, 6, 7, 8, 9, :, ;, <, =, >, ?].
//
void printArray(u8* pvideomem, void *array, u8 nItems, TFunc thefunction) {
u8 out = 0; // Value returned by getBit functions [0-15]
u8 i; // Counter through the number of elements in the array
u8 c; // Character to draw
// Iterate through all the items in the array to print them one by one
for (i = 0; i < nItems; ++i) {
// Access the array using the function that has been told to us
// in the parameter 'thefunction'
switch(thefunction) {
// Get element as a single bit (As return value could be anything,
// we distinguish between 0 and >0, so out will finally be 0 or 1).
case f_getbit: out = (cpct_getBit (array, i) > 0); break;
// Get element as a pair of bits
case f_get2bits: out = cpct_get2Bits(array, i); break;
// Get element as a chunk of 4 bits
case f_get4bits: out = cpct_get4Bits(array, i); break;
}
// Depending on the value got from getXBits function, calculate
// the character we have to print. (0 = '_', >0 = '0' + out)
if (out)
c = '0' + out;
else
c = '_';
// Draw the character and point to the next byte in memory (next location
// to draw a character, as 1 byte = 8 pixels in mode 2)
cpct_drawCharM2(pvideomem, 1, c);
pvideomem++;
}
}
/////////////////////////////////////////////////////////////////
// getTile
// Gets the value (0 or not-zero) of a concrete tile of the map.
// Coordinates refer to the concrete tile being addressed and are
// used to calculate the location of the tile in the map bitarray.
//
u8 map_getTile(u8 x, u8 y) {
// The map has MAP_HEIGHT rows, and each row has MAP_WIDTH
// tiles. Therefore, location (x,y) is y times MAP_WIDTH
// elements plus x elements.
u16 tile_index = y * MAP_WIDTH + x;
// Get the value of the tile (x,y) from the bitarray and return it
u8 tile_value = cpct_getBit(map, tile_index);
return tile_value;
}
