91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
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#include <ncurses.h>
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struct vec2 {
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int x;
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int y;
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};
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struct borders {
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int top;
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int bottom;
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int left;
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int right;
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};
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int main()
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{
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initscr(); // initialise screen
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clear(); // clear the empty buffer just in case
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noecho(); // disable the direct typing to the terminal so it doesn't mess with the application
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// here we define utility variables
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// borders for a pen point
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struct borders b;
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b.bottom = LINES;
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b.top = -1;
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b.left = -1;
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b.right = COLS;
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// pen point position
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struct vec2 position;
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position.x = COLS;
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position.y = LINES - 1;
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// pen point direction
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struct vec2 direction;
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direction.x = -1;
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direction.y = 0;
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// here we start the drawing
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for (int i = 0; i < COLS*LINES; i++)
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{
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// move & paint
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position.x += direction.x;
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position.y += direction.y;
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mvaddch(position.y, position.x, '*');
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// flush the buffer to show result on the screen
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refresh();
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// check if we are about to meet the border
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if (position.x + direction.x <= b.left) { // if yes, then...
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// turn right
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direction.x = 0;
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direction.y = -1;
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// grab the border and pull it towards us as bit
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b.bottom--;
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}
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// and then repeat for every single border we have...
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else if (position.y + direction.y <= b.top) {
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direction.x = 1;
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direction.y = 0;
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b.left++;
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}
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else if (position.x + direction.x >= b.right) {
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direction.x = 0;
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direction.y = 1;
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b.top++;
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}
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else if (position.y + direction.y >= b.bottom) {
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direction.x = -1;
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direction.y = 0;
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b.right--;
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}
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// and we wait... wait... wait...
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napms(20);
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}
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// hold the buffer until the keypress
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getch();
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// finish & cleanup
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endwin();
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return 0;
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}
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