285 lines
6.6 KiB
C
285 lines
6.6 KiB
C
#include "../compat/pgmspace.h"
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#include "../random/prng.h"
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#include "../config.h"
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#include "../pixel.h"
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#include "../util.h"
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/*
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* The following animations were developed by Martin Herweg (hence the name)
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* as a personal aid for getting familiar with programming the Borg.
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*
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* Although these animations are rarely used among Borg owners, we left them in
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* because of their simplicity in hopes that a novice Borg developer may find
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* them useful.
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*/
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// macro for simplifying flash memory access
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#define PGM(x) pgm_read_byte(&(x))
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// use 8 bit operands where feasible
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#if NUM_ROWS < 127 && NUM_COLS < 127
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typedef signed char operand_t;
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#else
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typedef int operand_t;
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#endif
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/**
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* An implementation of Bresenham's line drawing algorithm.
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* @param p1 first coordinate of the line
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* @param p2 second coordinate of the line
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* @param color brightness level of the line
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*/
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static void line(pixel p1,
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pixel const p2,
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unsigned char const color)
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{
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operand_t const dx = p1.x < p2.x ? p2.x - p1.x : p1.x - p2.x;
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operand_t const sx = p1.x < p2.x ? 1 : -1;
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operand_t const dy = p1.y < p2.y ? p2.y - p1.y : p1.y - p2.y;
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operand_t const sy = p1.y < p2.y ? 1 : -1;
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operand_t error = dx - dy;
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while(1)
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{
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setpixel(p1, color);
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if ((p1.x == p2.x) && (p1.y == p2.y))
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break;
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operand_t const error2 = 2 * error;
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if (error2 > -dy)
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{
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error -= dy;
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p1.x += sx;
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}
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if (error2 < dx)
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{
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error += dx;
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p1.y += sy;
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}
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}
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}
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/**
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* Draws a rectangle at the given coordinates.
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* @param p coordinate of the rectangle's upper right corner
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* @param w width of the rectangle
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* @param h height of the rectangle
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* @param color brightness level of the rectangle
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*/
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static void filled_rectangle(pixel const p,
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unsigned char const w,
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unsigned char const h,
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unsigned char const color)
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{
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// emulate the rectangle via consecutive drawn lines
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for (unsigned char y = p.y; y < (p.y + h); ++y)
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{
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line((pixel){p.x, y}, (pixel){p.x + w - 1, y}, color);
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}
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}
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/**
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* Draws a checkbox like figure.
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*/
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static void checkbox()
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{
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// some parameters regarding appearance and timing
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unsigned char const color = NUMPLANE; // brightest color
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int const delay = 250, shiftdelay = 30;
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// draw a surrounding square
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static pixel const square[] = {{0, 0}, {7, 0}, {7, 7}, {0, 7}, {0, 0}};
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for (unsigned char i = 0; i < 4; ++i)
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{
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line(square[i], square[i + 1], color);
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wait(delay);
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}
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// draw two diagonal lines
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line ((pixel){7, 7}, (pixel){0, 0}, color);
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wait (delay);
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line ((pixel){0, 7}, (pixel){7, 0}, color);
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wait (delay * 3);
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// shift image to the right (shift_pximap_l() really shifts to the right)
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for (unsigned char x = NUM_COLS; x--;)
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{
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shift_pixmap_l();
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wait (shiftdelay);
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}
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}
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/**
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* Animated lines walking over the screen.
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*/
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static void movinglines()
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{
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// some parameters regarding appearance and timing
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unsigned char const color = NUMPLANE; // brightest color
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unsigned char const blank = 0;
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int const delay = 100;
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// a line walking to the right
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line((pixel){NUM_COLS - 1, NUM_ROWS - 1}, (pixel){NUM_COLS - 1, 0}, color);
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for (unsigned char x = 0; x < NUM_COLS; x++)
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{
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shift_pixmap_l();
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wait (delay);
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}
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// a line walking from the lower to the upper border
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for (unsigned char y = NUM_ROWS; y--;)
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{
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, color);
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wait (delay);
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, blank);
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}
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// quickly moving cross hairs
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for (unsigned char n = 0; n < 4; n++)
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{
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for (unsigned char x = 0; x < NUM_COLS - 1; x++)
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{
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unsigned char y = x % NUM_ROWS;
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, color);
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line ((pixel){x, 0}, (pixel){x, NUM_ROWS - 1}, color);
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wait (delay / 2);
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, blank);
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line ((pixel){x, 0}, (pixel){x, NUM_ROWS - 1}, blank);
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}
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}
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}
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/**
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* Draws a gradient colored square.
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*/
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static void rectangle1()
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{
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// we want a centered square
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unsigned char const xcenter = NUM_COLS / 2, ycenter = NUM_ROWS / 2;
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// it should be as big as the borg's height
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unsigned char size = NUM_ROWS;
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// darkest color as a starting point for the gradient
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unsigned char color = 0;
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// wait about 500 ms between each frame
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int const delay = 500;
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// create a gradient by drawing shrinking rectangles on top of each other
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clear_screen(0);
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for (unsigned char x = 8; x > 0; x--)
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{
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// draw the rectangle and wait for a moment
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filled_rectangle((pixel){(xcenter - x), (ycenter - x)},
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size, size, color);
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wait (delay);
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// iterate through all colors periodically
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++color;
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color %= (NUMPLANE + 1);
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// shrink the dimensions of the succeeding rectangle
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size -= 2;
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}
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wait (delay * 3);
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}
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/**
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* Draws randomly placed rectangles.
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*/
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static void rectangles()
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{
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unsigned char const blank = 0;
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clear_screen(blank);
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for (unsigned char n = 0; n < 60; n++)
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{
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// randomly chosen position, dimension and color
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unsigned char const x = random8() % NUM_COLS;
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unsigned char const y = random8() % NUM_ROWS;
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unsigned char const h = random8() % NUM_COLS / 2;
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unsigned char const w = random8() % NUM_ROWS / 2;
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unsigned char const color = random8() % (NUMPLANE + 1);
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filled_rectangle((pixel){x, y}, w, h, color);
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// wait between 500 and 750 ms
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wait (500 + random8());
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}
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}
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/**
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* Draws flashing slanted lines.
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*/
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static void lines1()
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{
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unsigned char const blank = 0;
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clear_screen(blank);
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for (unsigned char n = 0; n < 200; n++)
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{
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// randomly chosen position, dimension and color
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unsigned char const x = random8() % NUM_COLS;
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unsigned char const y = random8() % NUM_ROWS;
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unsigned char const h = random8() % NUM_COLS;
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unsigned char const w = random8() % NUM_ROWS;
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unsigned char const color = random8() % (NUMPLANE + 1);
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line((pixel){x, y}, (pixel){w, h}, color);
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wait(random8()); // wait up to 250 ms
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line((pixel){x, y}, (pixel){w, h}, blank);
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}
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}
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/**
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* Draws randomly placed dots.
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*/
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static void dots1()
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{
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// some parameters regarding appearance and timing
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int const glimmer_delay = 100;
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unsigned char const blank = 0;
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clear_screen(blank);
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// draw up to 50 dots
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for (unsigned char n = 50; n--;)
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{
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// random coordinates
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unsigned char x = random8() % NUM_COLS;
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unsigned char y = random8() % NUM_ROWS;
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// those dots are glimmering
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static unsigned char const color[5] PROGMEM = {1, 2, 3, 2, 1};
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for (unsigned char i = 0; i < 5; ++i)
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{
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setpixel ((pixel){x, y}, PGM(color[i]));
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wait(glimmer_delay);
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}
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// wait up to 2500 ms until the next dot is drawn
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wait (random8() * 10);
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}
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}
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/**
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* Go through all of Martin's animations.
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*/
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void mherweg()
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{
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lines1();
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dots1();
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movinglines();
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checkbox();
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rectangle1();
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rectangles();
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}
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