Fractals

CMakeLists.txt

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+# Configure with [fxsdk build-fx] or [fxsdk build-cg], which provide the
+# toolchain file and module path of the fxSDK
+
+cmake_minimum_required(VERSION 3.15)
+project(fractals)
+
+include(GenerateG1A)
+include(GenerateG3A)
+include(Fxconv)
+find_package(Gint 2.1 REQUIRED)
+
+set(SOURCES
+  src/main.c
+  # ...
+)
+# Shared assets, fx-9860G-only assets and fx-CG-50-only assets
+set(ASSETS
+  # ...
+)
+set(ASSETS_fx
+  assets-fx/example.png
+  # ...
+)
+set(ASSETS_cg
+  assets-cg/example.png
+  # ...
+)
+
+fxconv_declare_assets(${ASSETS} ${ASSETS_fx} ${ASSETS_cg} WITH_METADATA)
+
+add_executable(fractals ${SOURCES} ${ASSETS} ${ASSETS_${FXSDK_PLATFORM}})
+target_compile_options(fractals PRIVATE -Wall -Wextra -Os)
+target_link_libraries(fractals Gint::Gint)
+
+if("${FXSDK_PLATFORM_LONG}" STREQUAL fx9860G)
+  generate_g1a(TARGET fractals OUTPUT "fractals.g1a"
+    NAME "fractals" ICON assets-fx/icon.png)
+endif()

README.md

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+# Mandelbrot Casio
+
+An attempt at rendering the mandelbrot set fractal using [gint](https://gitea.planet-casio.com/Lephenixnoir/gint) for the fx series casio calculators.
+
+At the moment I am using a (probably) very inefficient algorithm for calcualting the mandelbrot set, so if you happen to know how to optimise this, feel free to!
+
+I would advise overclocking your calculator using a tool such as [ftune](http://pm.matrix.jp/ftune2e.html) to help with performance.
+
+## Controls
+
+- + zoom in
+- - zoom out
+- ↑ pan up
+- ↓ pan down
+- ← pan left
+- → pan right
+
+## Building
+
+I would reccomend using [fxsdk](https://gitea.planet-casio.com/Lephenixnoir/fxsdk) to build this:
+
+`fxsdk build-fx`
+
+inside the project directory

assets-fx/fxconv-metadata.txt

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+example.png:
+  type: bopti-image
+  name: img_example

src/main.c

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