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127 lines
4.4 KiB
127 lines
4.4 KiB
/*******************************************************************************************
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*
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* raylib [shapes] example - kaleidoscope
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*
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* Example complexity rating: [★★☆☆] 2/4
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*
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* Example originally created with raylib 5.5, last time updated with raylib 5.6
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*
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* Example contributed by Hugo ARNAL (@hugoarnal) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2025 Hugo ARNAL (@hugoarnal) and Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h"
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#define MAX_DRAW_LINES 8192
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// Line data type
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typedef struct {
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Vector2 start;
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Vector2 end;
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} Line;
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// Lines array as a global static variable to be stored
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// in heap and avoid potential stack overflow (on Web platform)
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static Line lines[MAX_DRAW_LINES] = { 0 };
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - kaleidoscope");
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// Line drawing properties
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int symmetry = 6;
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float angle = 360.0f/(float)symmetry;
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float thickness = 3.0f;
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Vector2 mousePos = { 0 };
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Vector2 prevMousePos = { 0 };
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Vector2 scaleVector = { 1.0f, -1.0f };
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Vector2 offset = { (float)screenWidth/2.0f, (float)screenHeight/2.0f };
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Camera2D camera = { 0 };
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camera.target = (Vector2){ 0 };
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camera.offset = offset;
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camera.rotation = 0.0f;
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camera.zoom = 1.0f;
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int lineCounter = 0;
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SetTargetFPS(20);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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prevMousePos = mousePos;
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mousePos = GetMousePosition();
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Vector2 lineStart = Vector2Subtract(mousePos, offset);
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Vector2 lineEnd = Vector2Subtract(prevMousePos, offset);
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if (IsMouseButtonDown(MOUSE_LEFT_BUTTON))
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{
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for (int s = 0; (s < symmetry) && (lineCounter < (MAX_DRAW_LINES - 1)); s++)
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{
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lineStart = Vector2Rotate(lineStart, angle*DEG2RAD);
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lineEnd = Vector2Rotate(lineEnd, angle*DEG2RAD);
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// Store mouse line
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lines[lineCounter].start = lineStart;
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lines[lineCounter].end = lineEnd;
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// Store reflective line
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lines[lineCounter + 1].start = Vector2Multiply(lineStart, scaleVector);
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lines[lineCounter + 1].end = Vector2Multiply(lineEnd, scaleVector);
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lineCounter += 2;
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}
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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BeginMode2D(camera);
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for (int s = 0; s < symmetry; s++)
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{
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for (int i = 0; i < lineCounter; i += 2)
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{
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DrawLineEx(lines[i].start, lines[i].end, thickness, BLACK);
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DrawLineEx(lines[i + 1].start, lines[i + 1].end, thickness, BLACK);
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}
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}
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EndMode2D();
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DrawText(TextFormat("LINES: %i/%i", lineCounter, MAX_DRAW_LINES), 10, screenHeight - 30, 20, MAROON);
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DrawFPS(10, 10);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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