Add CoordinateConverter to get logical postion

src/graphics/CoordinateConverter.cpp

@@ -0,0 +1,38 @@
+#include "CoordinateConverter.h"
+
+CoordinateConverter::CoordinateConverter(SDL_Renderer* renderer) : m_renderer(renderer) {
+
+}
+
+CoordinateConverter::~CoordinateConverter() {
+
+}
+
+std::optional<std::pair<int, int>> CoordinateConverter::ScreenToBoard(float screenX, float screenY, BoardArea area) {
+    // 将窗口坐标转为逻辑坐标
+    float logicalX, logicalY;
+    SDL_RenderCoordinatesFromWindow(
+        m_renderer,
+        static_cast<float>(screenX),
+        static_cast<float>(screenY),
+        &logicalX,
+        &logicalY
+    );
+    int mouseX = static_cast<int>(logicalX);
+    int mouseY = static_cast<int>(logicalY);
+     // 判断是否点击在棋盘区域内
+    if (mouseX < area.x || mouseX >= area.x + area.cellSize * area.cols ||
+        mouseY < area.y || mouseY >= area.y + area.cellSize * area.rows) {
+        return std::nullopt; // 点击在棋盘外
+    }
+
+    // 转换为逻辑坐标
+    int col = (mouseX - area.x) / area.cellSize;
+    int row = (mouseY - area.y) / area.cellSize;
+
+    // 安全检查（通常不需要，但保险）
+    if (row >= 0 && row < area.rows && col >= 0 && col < area.cols) {
+        return std::pair<int, int>{row, col};
+    }
+    return std::nullopt;
+}

src/graphics/CoordinateConverter.h

@@ -0,0 +1,15 @@
+#pragma once
+#include "utils/Config.h"
+#include <SDL3/SDL.h>
+#include <utility>
+#include <optional>
+class CoordinateConverter {
+public:
+    CoordinateConverter(SDL_Renderer* renderer);
+    ~CoordinateConverter();
+    // 将物理坐标转化成逻辑坐标
+    std::optional<std::pair<int, int>> ScreenToBoard(float screenX, float screenY, BoardArea aera);
+
+private:
+    SDL_Renderer* m_renderer;
+};