From bf68f406cb05b4a15d05e0a48415dcc22f71b573 Mon Sep 17 00:00:00 2001
From: Yui-Tanaka-Haha <yuyuihahayuyuyu@gmail.com>
Date: Sat, 15 Nov 2025 23:44:46 -0500
Subject: [PATCH] Create CsC.js

---
 mods/CsC.js | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 mods/CsC.js

diff --git a/mods/CsC.js b/mods/CsC.js
new file mode 100644
index 00000000..4b1a36f9
--- /dev/null
+++ b/mods/CsC.js
@@ -0,0 +1,138 @@
+runAfterLoad(function(){
+  const patternCache = {};
+  let currentPatternID = null;
+  let nextPatternID = 1;
+  const undoStack = [];
+  const redoStack = [];
+  const maxHistory = 50;
+
+  function saveAction(pixels){
+    undoStack.push(pixels.map(px=>({x:px.x,y:px.y,element:px.element,color:px.color,patternID:px.patternID})));
+    if(undoStack.length>maxHistory) undoStack.shift();
+    redoStack.length=0;
+  }
+
+  function undo(){
+    if(!undoStack.length) return;
+    const action = undoStack.pop();
+    const redoPixels = [];
+    action.forEach(a=>{
+      const px = pixelMap[a.x][a.y];
+      redoPixels.push({x:a.x,y:a.y,element:px.element,color:px.color,patternID:px.patternID});
+      px.element=a.element; px.color=a.color; px.patternID=a.patternID;
+    });
+    redoStack.push(redoPixels);
+  }
+
+  function redo(){
+    if(!redoStack.length) return;
+    const action = redoStack.pop();
+    const undoPixels = [];
+    action.forEach(a=>{
+      const px = pixelMap[a.x][a.y];
+      undoPixels.push({x:a.x,y:a.y,element:px.element,color:px.color,patternID:px.patternID});
+      px.element=a.element; px.color=a.color; px.patternID=a.patternID;
+    });
+    undoStack.push(undoPixels);
+  }
+
+  elements.undo_tool = {
+    color:"#f00", tool:undo, category:"tools", description:"Undo last action"
+  };
+  elements.redo_tool = {
+    color:"#0f0", tool:redo, category:"tools", description:"Redo last undone action"
+  };
+
+  elements.pattern_painter = {
+    color:"#888", tool:function(pixel,x,y){
+      if(!currentPatternID){
+        currentPatternID="pattern_"+(nextPatternID++);
+        patternCache[currentPatternID]=Array(8).fill().map(()=>Array(8).fill(0));
+      }
+      const pat = patternCache[currentPatternID];
+      const mx=Math.floor((x*8)%8), my=Math.floor((y*8)%8);
+      pat[my][mx]=1-pat[my][mx];
+    }, category:"tools", description:"Pattern painter (8x8)"
+  };
+
+  function drawPattern(ctx, pat, dx, dy, s){
+    for(let py=0;py<8;py++)for(let px=0;px<8;px++){
+      if(pat[py][px]){
+        ctx.fillStyle="#444";
+        ctx.fillRect(dx+px*s/8, dy+py*s/8, s/8, s/8);
+      }
+    }
+  }
+
+  elements.decor_block={
+    color:"#fff", behavior:behaviors.WALL, category:"solids",
+    onPlace:p=>{if(currentPatternID)p.patternID=currentPatternID; saveAction([p]);},
+    renderer:function(p,ctx,dx,dy,s){
+      if(p.patternID) drawPattern(ctx, patternCache[p.patternID], dx, dy, s);
+      else { ctx.fillStyle=p.color; ctx.fillRect(dx,dy,s,s); }
+    }
+  };
+
+  elements.batch_filler={
+    color:"#66f",
+    tool:function(pixel){
+      const area=[];
+      for(let dx=-2;dx<=2;dx++)for(let dy=-2;dy<=2;dy++){
+        const px=pixelMap[pixel.x+dx]?.[pixel.y+dy];
+        if(px){px.element="decor_block"; if(currentPatternID) px.patternID=currentPatternID; area.push(px);}
+      }
+      saveAction(area);
+    },
+    category:"tools",
+    description:"Fill 5x5 area with pattern"
+  };
+
+  elements.stamp_tool={
+    color:"#ff0",
+    tool:function(pixel){
+      if(!currentPatternID) return;
+      const area=[];
+      for(let dx=0;dx<8;dx++)for(let dy=0;dy<8;dy++){
+        const px=pixelMap[pixel.x+dx]?.[pixel.y+dy];
+        if(px){px.element="decor_block"; px.patternID=currentPatternID; area.push(px);}
+      }
+      saveAction(area);
+    },
+    category:"tools",
+    description:"Stamp 8x8 pattern"
+  };
+
+  elements.gradient_tool={
+    color:"#0ff",
+    tool:function(pixel){
+      const area=[];
+      for(let dx=0;dx<5;dx++)for(let dy=0;dy<5;dy++){
+        const px=pixelMap[pixel.x+dx]?.[pixel.y+dy];
+        if(px){
+          const r=Math.floor(255*dx/4), b=Math.floor(255*dy/4);
+          px.element="decor_block";
+          px.color=`rgb(${r},0,${b})`;
+          area.push(px);
+        }
+      }
+      saveAction(area);
+    },
+    category:"tools",
+    description:"Paint 5x5 gradient"
+  };
+
+  elements.curve_tool={
+    color:"#f0f",
+    tool:function(pixel){
+      const area=[];
+      for(let i=0;i<5;i++){
+        const px=pixelMap[pixel.x+i]?.[pixel.y+Math.floor(Math.sin(i/4*Math.PI)*4)];
+        if(px){px.element="decor_block"; if(currentPatternID) px.patternID=currentPatternID; area.push(px);}
+      }
+      saveAction(area);
+    },
+    category:"tools",
+    description:"Draw sine curve with pattern"
+  };
+
+});