109 lines
2.3 KiB
C
109 lines
2.3 KiB
C
// fractals add-in by davidovski
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// Copyright (C) 2021 davidovski
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include <gint/gint.h>
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#include <gint/display.h>
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#include <gint/keyboard.h>
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#include <gint/keycodes.h>
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typedef struct vec2 {
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float x;
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float y;
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} vec2;
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vec2 offset = {0, 0};
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vec2 poi = {1.5f, 0.5f};
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vec2 screen = {128, 64};
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float zoom = 2.0f;
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float max = 40.0f;
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vec2 add(vec2 a, vec2 b) {
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vec2 r = {a.x + b.x, a.y + b.y};
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return r;
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}
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double dot(vec2 a, vec2 b) {
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return a.x*b.x + a.y+b.y;
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}
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vec2 compsquare(vec2 z) {
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float temp = z.x;
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z.x = z.x*z.x - z.y*z.y;
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z.y = 2.0*temp*z.y;
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return z;
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}
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bool mandelbrot(vec2 point) {
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vec2 z = {0, 0};
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for (float iters = 0.0f; iters < max; ++iters) {
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vec2 sq = compsquare(z);
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z.x = sq.x + point.x;
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z.y = sq.y + point.y;
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z.x = sq.x + point.x;
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if (dot(z, z) > 4.0) return false;
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}
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return true;
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}
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int main(void) {
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gint_setrestart(1);
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while (true) {
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getkey();
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dclear(C_WHITE);
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for (float x = 0; x < 128; x++) {
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for (float y = 0; y < 64; y++) {
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vec2 point = {x / screen.x, y / screen.y};
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point.x *= screen.x / screen.y;
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point.x -= poi.x;
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point.y -= poi.y;
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point.x *= zoom;
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point.y *= zoom;
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point.x -= offset.x;
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point.y -= offset.y;
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if (mandelbrot(point)) {
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dpixel(x , y, C_BLACK);
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}
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dupdate();
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}
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}
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drect(1, 1, 3, 3, C_BLACK);
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dupdate();
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getkey();
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if (keydown(KEY_ADD)) zoom -= zoom * 0.2f;
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if (keydown(KEY_SUB)) zoom += zoom * 0.2f;
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if (keydown(KEY_UP)) offset.y -= zoom * 0.1f;
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if (keydown(KEY_DOWN)) offset.y += zoom * 0.1f;
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if (keydown(KEY_RIGHT)) offset.x -= zoom * 0.1f;
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if (keydown(KEY_LEFT)) offset.x += zoom * 0.1f;
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if (keydown(KEY_EXIT)) gint_osmenu();
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}
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return 0;
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}
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