Craig Evans
/
ELEC2645_Pong2021
Pong game for ELEC1620 board.
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Bitmap.cpp
00001 #include "Bitmap.h" 00002 00003 #include <iostream> 00004 00005 #include "N5110.h" 00006 00007 Bitmap::Bitmap(int const *contents, 00008 unsigned int const height, 00009 unsigned int const width) 00010 : 00011 _contents(std::vector<int>(height*width)), 00012 _height(height), 00013 _width(width) 00014 { 00015 // Perform a quick sanity check of the dimensions 00016 if (_contents.size() != height * width) { 00017 std::cerr << "Contents of bitmap has size " << _contents.size() 00018 << " pixels, but its dimensions were specified as " 00019 << width << " * " << height << " = " << width * height << std::endl; 00020 } 00021 00022 for(unsigned int i = 0; i < height*width; ++i) _contents[i] = contents[i]; 00023 } 00024 00025 /** 00026 * @returns the value of the pixel at the given position 00027 */ 00028 int Bitmap::get_pixel (unsigned int const row, 00029 unsigned int const column) const 00030 { 00031 // First check that row and column indices are within bounds 00032 if(column >= _width || row >= _height) 00033 { 00034 std::cerr << "The requested pixel with index " << row << "," << column 00035 << "is outside the bitmap dimensions: " << _width << "," 00036 << _height << std::endl; 00037 } 00038 00039 // Now return the pixel value, using row-major indexing 00040 return _contents[row * _width + column]; 00041 } 00042 00043 /** 00044 * @brief Prints the contents of the bitmap to the terminal 00045 */ 00046 void Bitmap::print() const 00047 { 00048 for (unsigned int row = 0; row < _height; ++row) 00049 { 00050 // Print each element of the row 00051 for (unsigned int column = 0; column < _width; ++column) 00052 { 00053 int pixel = get_pixel (row, column); 00054 std::cout << pixel; 00055 } 00056 00057 // And then terminate with a new-line character 00058 std::cout << std::endl; 00059 } 00060 } 00061 00062 /** 00063 * @brief Renders the contents of the bitmap onto an N5110 screen 00064 * 00065 * @param[in] lcd The screen to use for rendering 00066 * @param[in] x0 The horizontal position in pixels at which to render the bitmap 00067 * @param[in] y0 The vertical position in pixels at which to render the bitmap 00068 * 00069 * @details Note that x0, y0 gives the location of the top-left of the bitmap on 00070 * the screen. 00071 * This function only updates the buffer on the screen. You still need 00072 * to refresh the screen in order to actually see the bitmap. 00073 */ 00074 void Bitmap::render(N5110 &lcd, 00075 unsigned int const x0, 00076 unsigned int const y0) const 00077 { 00078 // Loop through each row of the bitmap image 00079 for (unsigned int bitmap_row = 0; bitmap_row < _height; ++bitmap_row) 00080 { 00081 // Row index on the screen for rendering the row of pixels 00082 unsigned int screen_row = y0 + bitmap_row; 00083 00084 // Render each pixel in the row 00085 for (unsigned int bitmap_col = 0; bitmap_col < _width; ++bitmap_col) 00086 { 00087 // Column index on the screen for rendering this pixel 00088 int screen_col = x0 + bitmap_col; 00089 00090 // Find the required value of the pixel at the given location within 00091 // the bitmap data and then write it to the LCD screen 00092 int pixel = get_pixel (bitmap_row, bitmap_col); 00093 lcd.setPixel(screen_col, screen_row, pixel); 00094 } 00095 } 00096 }
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