a rotate tool! ctrl-r, then select the area, it will rotate counterclockwise, no properties are saved right now, it deletes and recreates.

includes/powder.h

@@ -634,6 +634,8 @@ void update_particles_i(pixel *vid, int start, int inc);
 
 void update_particles(pixel *vid);
 
+void rotate_area(int area_x, int area_y, int area_w, int area_h);
+
 void clear_area(int area_x, int area_y, int area_w, int area_h);
 
 void create_box(int x1, int y1, int x2, int y2, int c);

src/main.c

@@ -1463,8 +1463,6 @@ int main(int argc, char *argv[])
         }
 	if(sdl_key=='d')
 		DEBUG_MODE = !DEBUG_MODE;
-	if(sdl_key=='r')
-		GENERATION = 0;
 	if(sdl_key=='i')
 	{
 		int nx, ny;
@@ -1512,6 +1510,13 @@ int main(int argc, char *argv[])
                 }
             }
         }
+	if(sdl_key=='r'&&(sdl_mod & (KMOD_LCTRL|KMOD_RCTRL)))
+        {
+            save_mode = 1;
+            copy_mode = 3;//rotate
+        }
+	else if(sdl_key=='r')
+		GENERATION = 0;
         if(sdl_key=='x'&&(sdl_mod & (KMOD_LCTRL|KMOD_RCTRL)))
         {
             save_mode = 1;
@@ -1868,6 +1873,14 @@ int main(int argc, char *argv[])
                     copy_mode = 0;
                     clear_area(save_x*CELL, save_y*CELL, save_w*CELL, save_h*CELL);
                 }
+		else if(copy_mode==3)//rotation
+                {
+			if(save_h>save_w)
+				save_w = save_h;
+		    rotate_area(save_x*CELL, save_y*CELL, save_w*CELL, save_w*CELL);//just do squares for now
+		    save_mode = 0;
+		    copy_mode = 0;			
+		}
                 else
                 {
                     stamp_save(save_x*CELL, save_y*CELL, save_w*CELL, save_h*CELL);
@@ -2148,7 +2161,14 @@ int main(int argc, char *argv[])
 
         if(save_mode)
         {
-            xor_rect(vid_buf, save_x*CELL, save_y*CELL, save_w*CELL, save_h*CELL);
+	    if(copy_mode==3)//special drawing for rotate, can remove once it can do rectangles
+	    {
+		    if(save_h>save_w)
+				save_w = save_h;
+		    xor_rect(vid_buf, save_x*CELL, save_y*CELL, save_w*CELL, save_w*CELL);
+	    }
+	    else
+		    xor_rect(vid_buf, save_x*CELL, save_y*CELL, save_w*CELL, save_h*CELL);
             da = 51;
             db = 269;
         }

src/powder.c

@@ -4918,6 +4918,56 @@ void update_particles(pixel *vid)
 
 }
 
+void rotate_area(int area_x, int area_y, int area_w, int area_h)
+{
+    int cx = 0;
+    int cy = 0;
+    char tpmap[area_h][area_w];
+    char rtpmap[area_w][area_h];
+    unsigned char tbmap[area_h][area_w];
+    unsigned char rtbmap[area_h][area_w];
+    for(cy=0; cy<area_h; cy++)
+    {
+        for(cx=0; cx<area_w; cx++)
+        {
+	    if(area_x + cx<XRES&&area_y + cy<YRES)
+		bmap[(cy+area_y)/CELL][(cx+area_x)/CELL] = 0;
+	    //tbmap[cy][cx] = bmap[(cy+area_y)/CELL][(cx+area_x)/CELL];//does not do walls right now, very glitchy
+        }
+    }
+    for(cy=0; cy<area_h; cy++)
+    {
+        for(cx=0; cx<area_w; cx++)
+        {
+	    if((area_x + cx<XRES&&area_y + cy<YRES) && !bmap[(cy+area_y)/CELL][(cx+area_x)/CELL])
+	    {
+		tpmap[cy][cx] = pmap[(int)(cy+area_y+0.5f)][(int)(cx+area_x+0.5f)]&0xFF;
+		delete_part(cx+area_x, cy+area_y);
+	    }
+	    else 
+		tpmap[cy][cx] = 0;
+        }
+    }
+    for(cy=0; cy<area_w; cy++)
+    {
+        for(cx=0; cx<area_h; cx++)
+        {
+		//rtbmap[(area_h-1)-cx][cy] = tbmap[cy][cx];
+		rtpmap[(area_h-1)-cx][cy] = tpmap[cy][cx];
+	}
+    }
+    for(cy=0; cy<area_w; cy++)
+    {
+        for(cx=0; cx<area_h; cx++)
+        {
+		//bmap[area_y+cy][area_x+cx] = rtbmap[cy][cx];
+		if(area_x + cx<XRES&&area_y + cy<YRES)
+			if(rtpmap[cy][cx]>0&&rtpmap[cy][cx]<PT_NUM)
+				create_part(-1,area_x + cx,area_y + cy,rtpmap[cy][cx]);
+	}
+    }
+}
+
 void clear_area(int area_x, int area_y, int area_w, int area_h)
 {
     int cx = 0;
@@ -5152,7 +5202,10 @@ int create_parts(int x, int y, int rx, int ry, int c)
         for(j=-ry; j<=ry; j++)
             for(i=-rx; i<=rx; i++)
                 if((CURRENT_BRUSH==CIRCLE_BRUSH && (pow(i,2))/(pow(rx,2))+(pow(j,2))/(pow(ry,2))<=1)||(CURRENT_BRUSH==SQUARE_BRUSH&&i*j<=ry*rx))
-                    create_part(-2, x+i, y+j, c);
+		    if(!REPLACE_MODE)
+			create_part(-2, x+i, y+j, c);
+		    else if((pmap[y+j][x+i]&0xFF)==SLALT&&SLALT!=0)
+			create_part(-2, x+i, y+j, c);
         return 1;
     }