streamlined M. Herweg's animations: now using Bresenham's line algorithm, removed obvious bugs, added some comments, saving 232 bytes
This commit is contained in:
Christian Kroll
parent
b39da5ff5e
commit
1a3239be1d
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@ -5,186 +5,186 @@
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#include "../util.h"
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#define RANDOM8(x) random8(x)
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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 owner's, 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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// straight or non straight line from one point to the other
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// value=brightness
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static void line(pixel p1, pixel p2, unsigned char value)
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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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char dx, dy, stepx, stepy, fraction;
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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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dy = p2.y - p1.y;
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dx = p2.x - p1.x;
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if (dy < 0)
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while(1)
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{
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dy = -dy;
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stepy = -1;
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}
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else
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{
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stepy = 1;
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}
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if (dx < 0)
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{
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dx = -dx;
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stepx = -1;
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}
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else
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{
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stepx = 1;
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}
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dx <<= 1;
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dy <<= 1;
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setpixel(p1, value);
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if (dx > dy)
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{
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fraction = dy - (dx >> 1);
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while (p1.x != p2.x)
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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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if (fraction >= 0)
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{
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p1.y += stepy;
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fraction -= dx;
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}
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p1.x += stepx;
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fraction += dy;
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setpixel(p1, value);
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error -= dy;
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p1.x += sx;
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}
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}
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else
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{
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fraction = dx - (dy >> 1);
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while (p1.y != p2.y)
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if (error2 < dx)
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{
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if (fraction >= 0)
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{
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p1.x += stepx;
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fraction -= dy;
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}
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p1.y += stepy;
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fraction += dx;
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setpixel(p1, value);
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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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// filled_rectangle p1=upper right corner, w=width, h=height ,
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// value=brightness
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static void filled_rectangle(pixel p1,
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unsigned char w,
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unsigned char h,
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unsigned char value)
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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 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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unsigned char y;
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for (y = p1.y; y < (p1.y + h); y++)
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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){p1.x,y}, (pixel){(p1.x+w-1),y}, value);
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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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void checkbox()
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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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unsigned char x, delay = 250;
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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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// quadrat aus linien
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line((pixel){0, 0}, (pixel){7, 0}, 3);
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wait (delay);
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line ((pixel){7, 0}, (pixel){7, 7}, 3);
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wait (delay);
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line ((pixel){7, 7}, (pixel){0, 7}, 3);
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wait (delay);
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line ((pixel){0, 7}, (pixel){0, 0}, 3);
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wait (delay);
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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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// 2 diagonale lininen
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line ((pixel){7, 7}, (pixel){0, 0}, 3);
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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}, 3);
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line ((pixel){0, 7}, (pixel){7, 0}, color);
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wait (delay * 3);
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for (x = NUM_COLS; x--;)
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// shift image to the right (shift_pximap_l() really shifts to right)
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for (unsigned char x = NUM_COLS; x--;)
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{
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// shift image right
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shift_pixmap_l ();
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wait (30);
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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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void movinglines()
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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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unsigned char x, y, n;
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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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line((pixel){NUM_COLS - 1, NUM_ROWS - 1}, (pixel){NUM_COLS - 1, 0}, 3);
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// linie wandert nach rechts
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for (x = 0; x < NUM_COLS; x++)
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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 (100);
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shift_pixmap_l();
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wait (delay);
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}
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// von unten nach oben
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for (y = NUM_ROWS; y--;)
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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}, 3);
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wait (100);
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, 0);
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//wait(10);
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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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// eine linie von rechts nach links und 1-8 mal von oben nach unten
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// je nach display format das ganze 4 mal
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for (n = 0; n < 4; n++)
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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 (x = 0; x < NUM_COLS - 1; x++)
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for (unsigned char x = 0; x < NUM_COLS - 1; x++)
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{
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y = x % NUM_ROWS;
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, 3);
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line ((pixel){x, 0}, (pixel){x, NUM_ROWS - 1}, 3);
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wait (50);
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line ((pixel){0, y}, (pixel){NUM_COLS - 1, y}, 0);
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line ((pixel){x, 0}, (pixel){x, NUM_ROWS - 1}, 0);
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//wait(10);
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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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//rechteckmuster mit helligkeitsstufen
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void rectangle1()
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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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unsigned char x, value, xcenter, ycenter, size;
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unsigned int delay = 500;
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xcenter = NUM_COLS / 2;
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ycenter = NUM_ROWS / 2;
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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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size = NUM_ROWS;
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value = 3;
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for (x = 8; x > 0; x--)
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for (unsigned char x = 8; x > 0; x--)
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{
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if (value < NUMPLANE)
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value++;
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else
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value = 0;
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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, value);
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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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@ -192,65 +192,93 @@ void rectangle1()
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}
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// zufallsrechtecke
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void rectangles()
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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 value, n, x, y, h, w;
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clear_screen(0);
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for (n = 0; n < 60; n++)
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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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x = RANDOM8() % NUM_COLS;
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y = RANDOM8() % NUM_ROWS;
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h = RANDOM8() % NUM_COLS / 2;
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w = RANDOM8() % NUM_ROWS / 2;
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value = RANDOM8() % (NUMPLANE + 1);
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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, value);
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wait (500 + RANDOM8 () % 3000);
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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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// schräge linien die aufblitzen
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void lines1()
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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 value, n, x, y, h, w;
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unsigned int delay = 500;
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clear_screen(0);
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for (n = 0; n < 200; n++)
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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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x = RANDOM8() % NUM_COLS;
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y = RANDOM8() % NUM_ROWS;
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h = RANDOM8() % NUM_COLS;
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w = RANDOM8() % NUM_ROWS;
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value = RANDOM8() % (NUMPLANE + 1);
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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}, value);
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wait (RANDOM8 () % delay);
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line ((pixel){x, y}, (pixel){w, h}, 0);
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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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// random dots
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void dots1()
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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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unsigned char n, x, y;
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clear_screen(0);
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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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for (n = 50; n--;)
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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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x = RANDOM8() % NUM_COLS;
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y = RANDOM8() % NUM_ROWS;
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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(100);
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wait(glimmer_delay);
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}
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wait ((RANDOM8 () % 255) * 10);
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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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@ -1,25 +1,6 @@
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#ifndef MHERWEG_H_
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#define MHERWEG_H_
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void checkbox();
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void movinglines();
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//rechteckmuster mit helligkeitsstufen
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void rectangle1();
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// zufallsrechtecke
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void rectangles();
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// schräge linien die aufblitzen
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void lines1();
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// random dots
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void dots1();
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void mherweg();
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#endif /* MHERWEG_H_ */
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@ -150,12 +150,7 @@ void display_loop(){
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#ifdef ANIMATION_MHERWEG
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case 13:
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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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mherweg();
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break;
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#endif
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