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//******************************************************************************
// @file TiledMap.cpp
// @author Nicolai Shlapunov
//
// @details DevCore: Tiled Map Class, implementation
//
// @copyright Copyright (c) 2017, Devtronic & Nicolai Shlapunov
// All rights reserved.
//
// @section SUPPORT
//
// Devtronic invests time and resources providing this open source code,
// please support Devtronic and open-source hardware/software by
// donations and/or purchasing products from Devtronic.
//
//******************************************************************************
// *****************************************************************************
// *** Includes ************************************************************
// *****************************************************************************
#include "TiledMap.h"
// *****************************************************************************
// *** Constructor *********************************************************
// *****************************************************************************
TiledMap::TiledMap(int32_t x, int32_t y, int32_t w, int32_t h,
uint8_t* map, uint32_t map_w, uint32_t map_h, uint8_t bitmask,
const ImageDesc* tiles, uint32_t n, int32_t def_color)
{
x_start = x;
y_start = y;
width = w;
height = h;
x_end = x_start + width - 1;
y_end = y_start + height - 1;
tiles_map = map;
map_width = map_w;
map_height = map_h;
tile_bitmask = bitmask;
tiles_img = tiles;
tiles_cnt = n;
tile_width = tiles->width;
tile_height = tiles->height;
bg_color = def_color;
}
// *****************************************************************************
// *** Put line in buffer **************************************************
// *****************************************************************************
void TiledMap::DrawInBufW(uint16_t* buf, int32_t n, int32_t line, int32_t start_x)
{
// Draw only if needed
if((line >= y_start) && (line <= y_end))
{
int32_t start_offset = 0;
// Find start x position
int32_t start = x_start - start_x;
// Prevent write in memory before buffer
if(start < 0)
{
start_offset = -start;
start = 0;
}
// Find end x position
int32_t end = x_end - start_x;
// Prevent buffer overflow
if(end >= n) end = n - 1;
// Find start tile index and offsets
int32_t x_tile_idx = (x_pos + start_x + start_offset) / tile_width;
int32_t y_tile_idx = (y_pos + line - y_start) / tile_height;
int32_t tile_idx = y_tile_idx * map_width + x_tile_idx;
int32_t x_tile_offset = (x_pos + start_x + start_offset) % tile_width;
int32_t y_tile_offset = ((y_pos + line - y_start) % tile_height) * tile_width;
// If default color is 0 or greater
if(bg_color >= 0)
{
// Fill buffer by default color
for(int32_t i = start; i < end; i++)
{
buf[i] = bg_color;
}
}
// Prepare variables for first cycle
int32_t pix_idx = start;
int32_t tile_pix_idx = x_tile_offset;
// Draw line with tiles
while(pix_idx < n)
{
// Get tile value
uint8_t tile_val = tiles_map[tile_idx] & tile_bitmask;
// Skip empty tiles
if(tile_val >= tiles_cnt)
{
pix_idx += tile_width - tile_pix_idx;
tile_idx++;
tile_pix_idx = 0;
continue;
}
// Get pointer to the current tile image
const uint8_t* tile_ptr = &tiles_img[tile_val].img8[y_tile_offset];
// Get pointer to the current tile palette
const uint16_t* palette_ptr = tiles_img[tile_val].palette;
// Get transparent color
const int32_t transparent_color = tiles_img[tile_val].transparent_color;
// Draw tile
for(;(tile_pix_idx < (int32_t)tile_width) && (pix_idx <= end); tile_pix_idx++)
{
// Get pixel data
uint16_t data = palette_ptr[tile_ptr[tile_pix_idx]];
// If not transparent - output to buffer
if(data != transparent_color) buf[pix_idx] = data;
pix_idx++;
}
// Increase tile index
tile_idx++;
// Clear tile pixel counter
tile_pix_idx = 0;
}
}
}
// *****************************************************************************
// *** Put line in buffer **************************************************
// *****************************************************************************
void TiledMap::DrawInBufH(uint16_t* buf, int32_t n, int32_t row, int32_t start_y)
{
// Not implemented yet
}
// *****************************************************************************
// *** Scroll tiled map ****************************************************
// *****************************************************************************
void TiledMap::ScrollView(int32_t dx, int32_t dy)
{
LockVisObject();
x_pos += dx;
if(x_pos < 0) x_pos = 0;
y_pos += dy;
if(y_pos < 0) y_pos = 0;
UnlockVisObject();
}
// *****************************************************************************
// *** GetLvlIdxByXY *******************************************************
// *****************************************************************************
int32_t TiledMap::GetLvlIdxByXY(uint32_t x, uint32_t y)
{
uint32_t result = -1;
// Calculate tiles indexes
uint32_t x_tile = x/tile_width;
uint32_t y_tile = y/tile_height;
// Set result only if x & y valid values
if(x_tile < map_width && y_tile < map_height)
{
result = y_tile*map_width + x_tile;
}
// Return result
return result;
}
// *****************************************************************************
// *** GetLvlDataByXY ******************************************************
// *****************************************************************************
int8_t TiledMap::GetLvlDataByXY(uint32_t x, uint32_t y)
{
uint32_t result = 0U;
// Calculate tiles indexes
uint32_t x_tile = x/tile_width;
uint32_t y_tile = y/tile_height;
// Set result only if x & y valid values
if(x_tile < map_width && y_tile < map_height)
{
result = tiles_map[y_tile*map_width + x_tile];
}
// Return result
return result;
}
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