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312 行
13 KiB
312 行
13 KiB
/*******************************************************************************************
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*
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* raylib [core] example - undo redo
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*
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* Example complexity rating: [★★★☆] 3/4
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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 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 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include <stdlib.h> // Required for: calloc(), free()
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#include <string.h> // Required for: memcpy(), strcmp()
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#define MAX_UNDO_STATES 26 // Maximum undo states supported for the ring buffer
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#define GRID_CELL_SIZE 24
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#define MAX_GRID_CELLS_X 30
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#define MAX_GRID_CELLS_Y 13
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//----------------------------------------------------------------------------------
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// Types and Structures Definition
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//----------------------------------------------------------------------------------
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// Point struct, like Vector2 but using int
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typedef struct {
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int x;
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int y;
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} Point;
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// Player state struct
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// NOTE: Contains all player data that needs to be affected by undo/redo
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typedef struct {
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Point cell;
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Color color;
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} PlayerState;
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//------------------------------------------------------------------------------------
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// Module Functions Declaration
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//------------------------------------------------------------------------------------
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// Draw undo system visualization logic
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static void DrawUndoBuffer(Vector2 position, int firstUndoIndex, int lastUndoIndex, int currentUndoIndex, int slotSize);
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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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// We have multiple options to implement an Undo/Redo system
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// Probably the most professional one is using the Command pattern to
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// define Actions and store those actions into an array as the events happen,
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// raylib internal Automation System actually uses a similar approach,
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// but in this example we are using another more simple solution,
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// just record PlayerState changes when detected, checking for changes every certain frames
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// This approach requires more memory and is more performance costly but it is quite simple to implement
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InitWindow(screenWidth, screenHeight, "raylib [core] example - undo redo");
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// Undo/redo system variables
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int currentUndoIndex = 0;
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int firstUndoIndex = 0;
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int lastUndoIndex = 0;
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int undoFrameCounter = 0;
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Vector2 undoInfoPos = { 110, 400 };
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// Init current player state and undo/redo recorded states array
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PlayerState player = { 0 };
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player.cell = (Point){ 10, 10 };
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player.color = RED;
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// Init undo buffer to store MAX_UNDO_STATES states
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PlayerState *states = (PlayerState *)RL_CALLOC(MAX_UNDO_STATES, sizeof(PlayerState));
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// Init all undo states to current state
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for (int i = 0; i < MAX_UNDO_STATES; i++) memcpy(&states[i], &player, sizeof(PlayerState));
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// Grid variables
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Vector2 gridPosition = { 40, 60 };
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SetTargetFPS(60);
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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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// Player movement logic
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if (IsKeyPressed(KEY_RIGHT)) player.cell.x++;
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else if (IsKeyPressed(KEY_LEFT)) player.cell.x--;
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else if (IsKeyPressed(KEY_UP)) player.cell.y--;
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else if (IsKeyPressed(KEY_DOWN)) player.cell.y++;
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// Make sure player does not go out of bounds
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if (player.cell.x < 0) player.cell.x = 0;
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else if (player.cell.x >= MAX_GRID_CELLS_X) player.cell.x = MAX_GRID_CELLS_X - 1;
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if (player.cell.y < 0) player.cell.y = 0;
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else if (player.cell.y >= MAX_GRID_CELLS_Y) player.cell.y = MAX_GRID_CELLS_Y - 1;
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// Player color change logic
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if (IsKeyPressed(KEY_SPACE))
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{
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player.color.r = (unsigned char)GetRandomValue(20, 255);
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player.color.g = (unsigned char)GetRandomValue(20, 220);
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player.color.b = (unsigned char)GetRandomValue(20, 240);
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}
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// Undo state change logic
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undoFrameCounter++;
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// Waiting a number of frames before checking if we should store a new state snapshot
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if (undoFrameCounter >= 2) // Checking every 2 frames
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{
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if (memcmp(&states[currentUndoIndex], &player, sizeof(PlayerState)) != 0)
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{
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// Move cursor to next available position of the undo ring buffer to record state
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currentUndoIndex++;
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if (currentUndoIndex >= MAX_UNDO_STATES) currentUndoIndex = 0;
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if (currentUndoIndex == firstUndoIndex) firstUndoIndex++;
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if (firstUndoIndex >= MAX_UNDO_STATES) firstUndoIndex = 0;
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memcpy(&states[currentUndoIndex], &player, sizeof(PlayerState));
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lastUndoIndex = currentUndoIndex;
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}
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undoFrameCounter = 0;
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}
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// Recover previous state from buffer: CTRL+Z
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if (IsKeyDown(KEY_LEFT_CONTROL) && IsKeyPressed(KEY_Z))
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{
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if (currentUndoIndex != firstUndoIndex)
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{
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currentUndoIndex--;
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if (currentUndoIndex < 0) currentUndoIndex = MAX_UNDO_STATES - 1;
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if (memcmp(&states[currentUndoIndex], &player, sizeof(PlayerState)) != 0)
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{
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memcpy(&player, &states[currentUndoIndex], sizeof(PlayerState));
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}
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}
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}
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// Recover next state from buffer: CTRL+Y
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if (IsKeyDown(KEY_LEFT_CONTROL) && IsKeyPressed(KEY_Y))
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{
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if (currentUndoIndex != lastUndoIndex)
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{
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int nextUndoIndex = currentUndoIndex + 1;
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if (nextUndoIndex >= MAX_UNDO_STATES) nextUndoIndex = 0;
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if (nextUndoIndex != firstUndoIndex)
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{
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currentUndoIndex = nextUndoIndex;
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if (memcmp(&states[currentUndoIndex], &player, sizeof(PlayerState)) != 0)
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{
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memcpy(&player, &states[currentUndoIndex], sizeof(PlayerState));
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}
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}
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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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// Draw controls info
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DrawText("[ARROWS] MOVE PLAYER - [SPACE] CHANGE PLAYER COLOR", 40, 20, 20, DARKGRAY);
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// Draw player visited cells recorded by undo
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// NOTE: Remember we are using a ring buffer approach so,
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// some cells info could start at the end of the array and end at the beginning
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if (lastUndoIndex > firstUndoIndex)
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{
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for (int i = firstUndoIndex; i < currentUndoIndex; i++)
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DrawRectangle(gridPosition.x + states[i].cell.x*GRID_CELL_SIZE, gridPosition.y + states[i].cell.y*GRID_CELL_SIZE,
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GRID_CELL_SIZE, GRID_CELL_SIZE, LIGHTGRAY);
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}
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else if (firstUndoIndex > lastUndoIndex)
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{
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if ((currentUndoIndex < MAX_UNDO_STATES) && (currentUndoIndex > lastUndoIndex))
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{
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for (int i = firstUndoIndex; i < currentUndoIndex; i++)
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DrawRectangle(gridPosition.x + states[i].cell.x*GRID_CELL_SIZE, gridPosition.y + states[i].cell.y*GRID_CELL_SIZE,
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GRID_CELL_SIZE, GRID_CELL_SIZE, LIGHTGRAY);
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}
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else
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{
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for (int i = firstUndoIndex; i < MAX_UNDO_STATES; i++)
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DrawRectangle(gridPosition.x + states[i].cell.x*GRID_CELL_SIZE, gridPosition.y + states[i].cell.y*GRID_CELL_SIZE,
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GRID_CELL_SIZE, GRID_CELL_SIZE, LIGHTGRAY);
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for (int i = 0; i < currentUndoIndex; i++)
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DrawRectangle(gridPosition.x + states[i].cell.x*GRID_CELL_SIZE, gridPosition.y + states[i].cell.y*GRID_CELL_SIZE,
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GRID_CELL_SIZE, GRID_CELL_SIZE, LIGHTGRAY);
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}
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}
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// Draw game grid
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for (int y = 0; y <= MAX_GRID_CELLS_Y; y++)
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DrawLine(gridPosition.x, gridPosition.y + y*GRID_CELL_SIZE,
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gridPosition.x + MAX_GRID_CELLS_X*GRID_CELL_SIZE, gridPosition.y + y*GRID_CELL_SIZE, GRAY);
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for (int x = 0; x <= MAX_GRID_CELLS_X; x++)
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DrawLine(gridPosition.x + x*GRID_CELL_SIZE, gridPosition.y,
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gridPosition.x + x*GRID_CELL_SIZE, gridPosition.y + MAX_GRID_CELLS_Y*GRID_CELL_SIZE, GRAY);
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// Draw player
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DrawRectangle(gridPosition.x + player.cell.x*GRID_CELL_SIZE, gridPosition.y + player.cell.y*GRID_CELL_SIZE,
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GRID_CELL_SIZE + 1, GRID_CELL_SIZE + 1, player.color);
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// Draw undo system buffer info
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DrawText("UNDO STATES:", undoInfoPos.x - 85, undoInfoPos.y + 9, 10, DARKGRAY);
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DrawUndoBuffer(undoInfoPos, firstUndoIndex, lastUndoIndex, currentUndoIndex, 24);
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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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RL_FREE(states); // Free undo states array
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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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//------------------------------------------------------------------------------------
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// Module Functions Definition
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//------------------------------------------------------------------------------------
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// Draw undo system visualization logic
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// NOTE: Visualizing the ring buffer array, every square can store a player state
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static void DrawUndoBuffer(Vector2 position, int firstUndoIndex, int lastUndoIndex, int currentUndoIndex, int slotSize)
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{
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// Draw index marks
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DrawRectangle(position.x + 8 + slotSize*currentUndoIndex, position.y - 10, 8, 8, RED);
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DrawRectangleLines(position.x + 2 + slotSize*firstUndoIndex, position.y + 27, 8, 8, BLACK);
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DrawRectangle(position.x + 14 + slotSize*lastUndoIndex, position.y + 27, 8, 8, BLACK);
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// Draw background gray slots
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for (int i = 0; i < MAX_UNDO_STATES; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, LIGHTGRAY);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, GRAY);
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}
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// Draw occupied slots: firstUndoIndex --> lastUndoIndex
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if (firstUndoIndex <= lastUndoIndex)
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{
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for (int i = firstUndoIndex; i < lastUndoIndex + 1; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, SKYBLUE);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, BLUE);
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}
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}
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else if (lastUndoIndex < firstUndoIndex)
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{
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for (int i = firstUndoIndex; i < MAX_UNDO_STATES; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, SKYBLUE);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, BLUE);
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}
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for (int i = 0; i < lastUndoIndex + 1; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, SKYBLUE);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, BLUE);
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}
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}
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// Draw occupied slots: firstUndoIndex --> currentUndoIndex
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if (firstUndoIndex < currentUndoIndex)
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{
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for (int i = firstUndoIndex; i < currentUndoIndex; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, GREEN);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, LIME);
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}
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}
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else if (currentUndoIndex < firstUndoIndex)
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{
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for (int i = firstUndoIndex; i < MAX_UNDO_STATES; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, GREEN);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, LIME);
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}
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for (int i = 0; i < currentUndoIndex; i++)
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{
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DrawRectangle(position.x + slotSize*i, position.y, slotSize, slotSize, GREEN);
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DrawRectangleLines(position.x + slotSize*i, position.y, slotSize, slotSize, LIME);
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}
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}
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// Draw current selected UNDO slot
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DrawRectangle(position.x + slotSize*currentUndoIndex, position.y, slotSize, slotSize, GOLD);
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DrawRectangleLines(position.x + slotSize*currentUndoIndex, position.y, slotSize, slotSize, ORANGE);
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}
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