From 5f4a323ae13243be2d8dfcb8cf080f04d08ebd1e Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Sat, 17 May 2025 19:42:59 -0700
Subject: More interactive thigns

---
 src/ui.cpp | 74 ++++++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 43 insertions(+), 31 deletions(-)

(limited to 'src/ui.cpp')

diff --git a/src/ui.cpp b/src/ui.cpp
index cb68c66..aa72ac9 100644
--- a/src/ui.cpp
+++ b/src/ui.cpp
@@ -3,6 +3,7 @@
 #include "sandbox.hpp"
 
 #include <imgui.h>
+#include <memory>
 
 static void AddSand(Sandbox& sb) {
     for (int y = 80; y <= 90; ++y) {
@@ -12,30 +13,37 @@ static void AddSand(Sandbox& sb) {
     }
 }
 
-constexpr int kWidth = 40;
-constexpr int kHeight = 100;
-constexpr float kScale = 4.0f;
-constexpr ImVec2 kSize(kWidth* kScale, kHeight* kScale);
-
-static ImVec2 TrSandbox2Screen(ImVec2 origin, Pt pt) {
-    return ImVec2(origin.x + kScale * pt.x, origin.y - kScale * pt.y);
-}
-
 struct ImRect {
     ImVec2 top_left;
     ImVec2 bottom_right;
 };
-// Assuming inclusive-inclusive rectangle
-static ImRect TrSandbox2Screen(ImVec2 origin, Rect r) {
-    return {
-        ImVec2(origin.x + kScale * r.bl.x, origin.y - kScale * (r.tr.y+1)),
-        ImVec2(origin.x + kScale * (r.tr.x + 1), origin.y - kScale * r.bl.y),
-    };
-}
+
+struct SandboxCfg {
+    int width = 40, height = 100;
+    float tile_size = 4.0f;
+
+    ImVec2 tr_sandbox2screen(ImVec2 origin, Pt pt) const {
+        return ImVec2(origin.x + tile_size * pt.x, origin.y - tile_size * pt.y);
+    }
+
+    // Assuming inclusive-inclusive rectangle
+    ImRect tr_sandbox2screen(ImVec2 origin, Rect r) const {
+        return {
+            ImVec2(origin.x + tile_size * r.bl.x, origin.y - tile_size * (r.tr.y + 1)),
+            ImVec2(origin.x + tile_size * (r.tr.x + 1), origin.y - tile_size * r.bl.y),
+        };
+    }
+
+    std::unique_ptr<Sandbox> make_sandbox() const {
+        return std::make_unique<Sandbox>(width, height);
+    }
+};
 
 void ShowEverything() {
     ImGui::Begin("Sandbox");
-    static Sandbox sandbox(40, 100);
+
+    static SandboxCfg cfg;
+    static std::unique_ptr<Sandbox> sandbox = cfg.make_sandbox();
     static OglImage gl;
 
     static bool running = false;
@@ -43,33 +51,37 @@ void ShowEverything() {
     static bool show_dirty_rect = true;
     ImGui::Checkbox("Show dirty rects", &show_dirty_rect);
 
-    ImGui::Text("ncycle = %d", sandbox.ncycle);
+    ImGui::Text("ncycle = %d", sandbox->ncycle);
     ImGui::SameLine();
     bool step = ImGui::Button("Step");
 
     if (step || running) {
-        sandbox.simulate_step();
-        gl.upload(reinterpret_cast<const char*>(sandbox.bitmap), kWidth, kHeight);
+        sandbox->simulate_step();
     }
 
-    // TODO this makes things very wrong (no proper assignment operator)
-    // if (ImGui::Button("Reset sandbox")) {
-    //     sandbox = Sandbox(40, 100);
-    // }
-    // ImGui::SameLine();
+    // TODO popup for changing these params?
+    // TODO migrate existing content
+    ImGui::InputInt("Sandbox width", &cfg.width);
+    ImGui::InputInt("Sandbox height", &cfg.height);
+    if (ImGui::Button("Recreate")) {
+        sandbox = cfg.make_sandbox();
+    }
+    ImGui::SameLine();
     if (ImGui::Button("Add sand")) {
-        AddSand(sandbox);
+        AddSand(*sandbox);
     }
 
-    auto sandbox_topleft = ImGui::GetCursorScreenPos();
-    ImGui::Image(gl.as_imgui(), kSize, ImVec2(0, 1), ImVec2(1, 0));
+    ImVec2 img_size(cfg.tile_size * sandbox->width, cfg.tile_size * sandbox->height);
+    auto img_topleft = ImGui::GetCursorScreenPos();
+    gl.upload(reinterpret_cast<const char*>(sandbox->bitmap), sandbox->width, sandbox->height);
+    ImGui::Image(gl.as_imgui(), img_size, ImVec2(0, 1), ImVec2(1, 0));
     // bottom-left corner of the sandbox, in screen space
-    auto origin = sandbox_topleft;
-    origin.y += kSize.y;
+    auto origin = img_topleft;
+    origin.y += img_size.y;
 
     if (show_dirty_rect) {
         auto dl = ImGui::GetWindowDrawList();
-        auto [top_left, bottom_right] = TrSandbox2Screen(origin, sandbox.dirty_writeto);
+        auto [top_left, bottom_right] = cfg.tr_sandbox2screen(origin, sandbox->dirty_writeto);
         dl->AddRect(top_left, bottom_right, IM_COL32(255, 0, 0, 255));
     }
 
-- 
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