From 8270ca448dd86517468872d9fc26f0f5d402864a Mon Sep 17 00:00:00 2001
From: kartofen <mladenovnasko0@gmail.com>
Date: Wed, 12 Apr 2023 23:33:50 +0300
Subject: cirlce-thingy done

---
 circle-thingy/build.sh   |  22 +++++++++
 circle-thingy/main.c     | 124 +++++++++++++++++++++++++++++++++++++++++++++++
 circle-thingy/shell.html |  82 +++++++++++++++++++++++++++++++
 3 files changed, 228 insertions(+)
 create mode 100755 circle-thingy/build.sh
 create mode 100644 circle-thingy/main.c
 create mode 100644 circle-thingy/shell.html

(limited to 'circle-thingy')

diff --git a/circle-thingy/build.sh b/circle-thingy/build.sh
new file mode 100755
index 0000000..47c4d75
--- /dev/null
+++ b/circle-thingy/build.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+FLAGS="-Wall -Wextra -g -pedantic"
+RAYLIB_FLAGS="-lraylib -lm -lpthread -lGL -ldl -lrt -lX11"
+RAYLIB_SRC="/usr/local/src/raylib/src"
+
+mkdir -p bin
+set -xe
+
+if ! [[ $1 = "web" ]]; then
+    gcc -o bin/main main.c $DEBUG_FLAGS $RAYLIB_FLAGS
+else
+    source emsdk_env.sh
+
+    emcc -o bin/circle-thingy.html *.c \
+         -O2 -DPLATFORM_WEB \
+         -DRAYLIB_SRC="\"$RAYLIB_SRC/raylib.h\"" \
+         $RAYLIB_SRC/libraylib.a \
+         -I$RAYLIB_SRC/raylib.h \
+         -s USE_GLFW=3 -s ASYNCIFY \
+         --shell-file shell.html
+fi
diff --git a/circle-thingy/main.c b/circle-thingy/main.c
new file mode 100644
index 0000000..38ba0fb
--- /dev/null
+++ b/circle-thingy/main.c
@@ -0,0 +1,124 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+#ifdef PLATFORM_WEB
+  #include RAYLIB_SRC
+#else
+  #include <raylib.h>
+#endif
+
+// game coords to screen coords
+#define GTOS(n) ((n) * (SH) / 2)
+#define GTOSV(n) ((Vector2){(GTOS(n.x)), (GTOS(n.y))})
+// screen coords to game coords
+#define STOG(n) ((n) / (SH) * 2)
+#define STOGV(n) ((Vector2){(STOG(n.x)), (STOG(n.y))})
+
+#define IN_RANGE(x, y, z) (((x) > ((y) - (z))) && ((x) < ((y) + (z))))
+#define IN_RANGEV(a, b, c) ((IN_RANGE(a.x, b.x, c)) && (IN_RANGE(a.y, b.y, c)))
+
+int SW = 1200;
+int SH =  800;
+int MAX_ITER = 50;
+
+Vector2 a = {-1, 0};
+Vector2 b = { 1, 0};
+
+char text[1024];
+
+Vector2 median(Vector2 p1, Vector2 p2)
+{
+    return (Vector2){(p1.x + p2.x)/2, (p1.y + p2.y)/2};
+}
+
+void calc_points(Vector2 p1, Vector2 p2, Vector2 q)
+{
+    static int iter = 0;
+    if(iter++ >= MAX_ITER) {
+        sprintf(text, "iter: %d; x: %f; y: %f", iter-1, p1.x, -p1.y);
+        iter = 0;
+        return;
+    }
+
+    DrawLineV(GTOSV(p1), GTOSV(p2), (iter % 2 == 0) ? RED : BLUE);
+
+    calc_points(q, median(p1, p2), p2);
+}
+
+int main(void)
+{
+    InitWindow(SW, SH, "circle thingy");
+    SetTargetFPS(60);
+    SetWindowState(FLAG_WINDOW_RESIZABLE);
+
+    printf("\n----------------------- Instructions -----------------------\n");
+    printf("Use WASD to move around\n");
+    printf("Use Q and E increase or decrease the iterations\n");
+    printf("Use the mouse to move the points and to zoom in or out\n");
+    printf("------------------------------------------------------------\n");
+
+    Camera2D camera = {0};
+    camera.zoom = 1.0f;
+
+    while (!WindowShouldClose())
+    {
+        // for resizing
+        SW = GetScreenWidth();
+        SH = GetScreenHeight();
+        camera.offset = (Vector2){SW/2.0f, SH/2.0f};
+
+        if(IsKeyDown(KEY_W)) camera.target.y -= 500.0f * GetFrameTime();
+        if(IsKeyDown(KEY_A)) camera.target.x -= 500.0f * GetFrameTime();
+        if(IsKeyDown(KEY_S)) camera.target.y += 500.0f * GetFrameTime();
+        if(IsKeyDown(KEY_D)) camera.target.x += 500.0f * GetFrameTime();
+        if(IsKeyPressed(KEY_Q)) MAX_ITER++;
+        if(IsKeyPressed(KEY_E)) MAX_ITER--;
+        camera.zoom += ((float)GetMouseWheelMove()*0.05f);
+
+        static bool a_moving = false;
+        static bool b_moving = false;
+
+        BeginDrawing();
+        ClearBackground(RAYWHITE);
+
+        BeginMode2D(camera);
+            DrawCircleLines(0, 0, GTOS(1), BLACK);
+            DrawLine(GTOS(0), GTOS(1), GTOS(0), GTOS(-1), BLACK);
+            DrawLine(GTOS(1), GTOS(0), GTOS(-1), GTOS(0), BLACK);
+
+            DrawCircleV(GTOSV(a), 10, BLUE);
+            DrawCircleV(GTOSV(b), 10, RED);
+
+            // moving the point a
+            if(IN_RANGEV(GetScreenToWorld2D(GetMousePosition(), camera), GTOSV(a), 10)
+               || a_moving) {
+                DrawCircleLines(GTOS(a.x), GTOS(a.y), 13, BLUE);
+
+                if(IsMouseButtonDown(MOUSE_BUTTON_LEFT) && !b_moving) {
+                    a = STOGV(GetScreenToWorld2D(GetMousePosition(), camera));
+                    a_moving = true;
+                } else a_moving = false;
+            }
+
+            // moving the point b
+            if(IN_RANGEV(GetScreenToWorld2D(GetMousePosition(), camera), GTOSV(b), 10)
+               || b_moving) {
+                DrawCircleLines(GTOS(b.x), GTOS(b.y), 13, RED);
+
+                if(IsMouseButtonDown(MOUSE_BUTTON_LEFT) && !a_moving) {
+                    b = STOGV(GetScreenToWorld2D(GetMousePosition(), camera));
+                    b_moving = true;
+                } else b_moving = false;
+            }
+
+            calc_points((Vector2){0, -1}, a, b);
+        EndMode2D();
+
+        DrawFPS(10, 10);
+        DrawText(text, 100, 10, 30, DARKGREEN);
+        EndDrawing();
+    }
+
+    CloseWindow();
+    return 0;
+}
diff --git a/circle-thingy/shell.html b/circle-thingy/shell.html
new file mode 100644
index 0000000..2188465
--- /dev/null
+++ b/circle-thingy/shell.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<html lang="en-us">
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <title>Pendulum</title>
+    <style>
+      .el { margin: 5px; }
+      div.el { float: left; }
+      textarea.el { font-family: monospace; width: 100%; }
+      canvas.el { border: 0px none; background-color: black; }
+    </style>
+  </head>
+  <body>
+    <div class="el" id="status">Downloading...</div>
+
+    <div class="el">
+      <canvas id="canvas" oncontextmenu="event.preventDefault()" tabindex=-1></canvas>
+    </div>
+
+    <textarea class="el" id="output" rows="12"></textarea>
+
+    <script type='text/javascript'>
+      var statusElement = document.getElementById('status');
+
+      var Module = {
+          attachGLFWEventsToCanvas: true,
+          preRun: [],
+          postRun: [],
+          arguments: [],
+          print: (function() {
+              var element = document.getElementById('output');
+          if (element) element.value = ''; // clear browser cache
+          return function(text) {
+            if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
+            // These replacements are necessary if you render to raw HTML
+            //text = text.replace(/&/g, "&amp;");
+            //text = text.replace(/</g, "&lt;");
+            //text = text.replace(/>/g, "&gt;");
+            //text = text.replace('\n', '<br>', 'g');
+            console.log(text);
+            if (element) {
+              element.value += text + "\n";
+              element.scrollTop = element.scrollHeight; // focus on bottom
+            }
+          };
+        })(),
+        canvas: (function() {
+          var canvas = document.getElementById('canvas');
+
+          // As a default initial behavior, pop up an alert when webgl context is lost. To make your
+          // application robust, you may want to override this behavior before shipping!
+          // See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
+          canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);
+
+          return canvas;
+        })(),
+        setStatus: function(text) {
+          if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
+          if (text === Module.setStatus.last.text) return;
+          var now = Date.now();
+          Module.setStatus.last.time = now;
+          Module.setStatus.last.text = text;
+          statusElement.innerHTML = text;
+        },
+        totalDependencies: 0,
+        monitorRunDependencies: function(left) {
+          this.totalDependencies = Math.max(this.totalDependencies, left);
+          Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
+        }
+      };
+      Module.setStatus('Downloading...');
+      window.onerror = function() {
+        Module.setStatus('Exception thrown, see JavaScript console');
+        Module.setStatus = function(text) {
+          if (text) console.error('[post-exception status] ' + text);
+        };
+      };
+    </script>
+    {{{ SCRIPT }}}
+  </body>
+</html>
-- 
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