diff --git a/public/test.jpg b/public/test.jpg
index 014c9e0..e983e5f 100644
Binary files a/public/test.jpg and b/public/test.jpg differ
diff --git a/public/test1.jpg b/public/test1.jpg
new file mode 100644
index 0000000..014c9e0
Binary files /dev/null and b/public/test1.jpg differ
diff --git a/public/test3.jpg b/public/test3.jpg
new file mode 100644
index 0000000..80cfc71
Binary files /dev/null and b/public/test3.jpg differ
diff --git a/src/lib/ImageShow.svelte b/src/lib/ImageShow.svelte
index b304c8a..646220e 100644
--- a/src/lib/ImageShow.svelte
+++ b/src/lib/ImageShow.svelte
@@ -1,21 +1,26 @@
 <script>
-  import { v4 as uuidv4 } from "uuid";
   import { onMount, onDestroy } from "svelte";
 
   import Navbar from "./Navbar.svelte";
+  import Mask from "./Mask.svelte";
+  import { ImageProcess } from "./utils";
 
   const cv = window.cv;
+  let image_process = new ImageProcess();
 
   export let url = "test.jpg";
 
   let canvas_dom;
-  let canvas;
+  let resize_tag;
   let image;
+
+  let image_for_show;
   let window_width;
   let window_height;
   let canvas_width = 0;
   let canvas_height = 0;
-  let active;
+
+  let mask_tag = false;
 
   function LabelItem(label, items) {
     this.label = label;
@@ -26,7 +31,6 @@
   }
 
   function OperationItem(name, icon, handler = null) {
-    this.id = uuidv4();
     this.name = name;
     this.icon = icon;
     this.handler = handler;
@@ -38,12 +42,42 @@
       ["重新采集", "mdi mdi-reply-outline"],
     ]),
     new LabelItem("图像操作", [
-      ["向左旋转", "mdi mdi-file-rotate-left-outline", () => {}],
-      ["向右旋转", "mdi mdi-file-rotate-right-outline"],
+      [
+        "向左旋转",
+        "mdi mdi-file-rotate-left-outline",
+        () => {
+          image_process.turn_left();
+          cv.rotate(image_for_show, image_for_show, 0);
+          show_image();
+        },
+      ],
+      [
+        "向右旋转",
+        "mdi mdi-file-rotate-right-outline",
+        () => {
+          image_process.turn_right();
+          cv.rotate(image_for_show, image_for_show, 2);
+          show_image();
+        },
+      ],
       ["文本加强", "mdi mdi-image-filter-center-focus-strong"],
-      ["裁剪", "mdi mdi-crop"],
-      ["滚轮缩放", "mdi mdi-loupe"],
-      ["取消", "mdi mdi-alpha-x-circle-outline"],
+      [
+        "裁剪",
+        "mdi mdi-crop",
+        () => {
+          console.log(mask_tag);
+          mask_tag = mask_tag ? false : true;
+          console.log(mask_tag);
+        },
+      ],
+      [
+        "还原",
+        "mdi mdi-alpha-x-circle-outline",
+        () => {
+          image_process.recover();
+          init_canvas();
+        },
+      ],
     ]),
     new LabelItem("文件操作", [
       ["保存到本地", "mdi mdi-content-save-outline"],
@@ -57,108 +91,153 @@
   }
 
   function on_window_resize() {
-    /*setTimeout(() => {
-      let scale = Math.min(
-        canvas_height / image.height,
-        canvas_width / image.width
-      );
-
-      canvas.setWidth(image.width * scale);
-      canvas.setHeight(image.height * scale);
-
-      image.scale(scale);
-    }, 50);*/
-  }
-
-  function rotate(img, angle) {
-    let dst = new cv.Mat();
-    let dsize = new cv.Size(img.rows, img.cols);
-    let center = new cv.Point(img.cols / 2, img.rows / 2);
-    let M = cv.getRotationMatrix2D(center, angle, 1);
-    cv.warpAffine(
-      img,
-      dst,
-      M,
-      dsize,
-      cv.INTER_LINEAR,
-      cv.BORDER_CONSTANT,
-      new cv.Scalar()
-    );
-    return dst;
-  }
-
-  function resize(img, scale) {
-    let dst = new cv.Mat();
-    let dsize = new cv.Size(scale * img.cols, scale * img.rows);
-
-    cv.resize(img, dst, dsize, 0, 0, cv.INTER_AREA);
-    return dst;
-  }
-
-  function show_image(img, { option = {} }) {
-    if (option.hasOwnProperty("angle")) {
+    if (resize_tag) {
+      clearTimeout(resize_tag);
     }
-
-    let dst = img.clone();
-    for (const [key, value] of Object.entries(option)) {
-      if (key === "resize") {
-        let scale = Math.min(
-          canvas_height / image.height,
-          canvas_width / image.width
+    resize_tag = setTimeout(function () {
+      image_process.roi_init();
+      if (image) {
+        let pre_scale = Math.min(
+          canvas_height / image.rows,
+          canvas_width / image.cols
         );
-        dst = resize(dst, scale);
-        console.log(dst);
-      }
-      if (key === "rotate") {
-        dst = rotate
+        let pre_dsize = new cv.Size(
+          pre_scale * image.cols,
+          pre_scale * image.rows
+        );
+        cv.resize(
+          image_for_show,
+          image_for_show,
+          pre_dsize,
+          0,
+          0,
+          cv.INTER_AREA
+        );
+
+        show_image();
       }
+    }, 40);
+  }
+
+  function show_image() {
+    mask_tag = false;
+    let dst = new cv.Mat();
+    console.time("image show");
+    if (image_process.roi_tag) {
+      dst = image_for_show.roi(image_process.ROI_rect);
+    } else {
+      dst = image_for_show.clone();
     }
 
+    let scale = Math.min(canvas_height / dst.rows, canvas_width / dst.cols);
+    let dsize = new cv.Size(scale * dst.cols, scale * dst.rows);
+    cv.resize(dst, dst, dsize, 0, 0, cv.INTER_AREA);
+
     cv.imshow("canvas", dst);
-    dst.delete;
+
+    console.timeEnd("image show");
+    dst.delete();
   }
 
   async function init_canvas() {
     let img = new Image();
+    image_for_show = new cv.Mat();
     img.src = url;
     img.onload = function () {
       setTimeout(() => {
         image = cv.imread(img);
-        let scale = Math.min(
+        let pre_scale = Math.min(
           canvas_height / image.rows,
           canvas_width / image.cols
         );
-        let dst = new cv.Mat();
-        let dsize = new cv.Size(scale * image.cols, scale * image.rows);
+        let pre_dsize = new cv.Size(
+          pre_scale * image.cols,
+          pre_scale * image.rows
+        );
+        cv.resize(image, image_for_show, pre_dsize, 0, 0, cv.INTER_AREA);
 
-        cv.resize(image, dst, dsize, 0, 0, cv.INTER_AREA);
-        cv.imshow("canvas", dst);
-        /*  image = new fabric.Image(img);
-          let scale = Math.min(
-            canvas_height / image.height,
-            canvas_width / image.width
-          );
-
-          image.scale(scale);
-          canvas.setWidth(image.width * scale);
-          canvas.setHeight(image.height * scale);
-          canvas.add(image);
-          console.log(image);*/
+        show_image();
       }, 50);
     };
   }
 
+  function wheel_event_handler(e) {
+    e.preventDefault();
+    let mouse_point = new cv.Point(
+      e.clientX - canvas_dom.offsetLeft,
+      e.clientY - canvas_dom.offsetTop
+    );
+    image_process.roi(
+      image_for_show.rows,
+      image_for_show.cols,
+      mouse_point,
+      e.deltaY
+    );
+    show_image();
+  }
+
+  function keyboard_move_roi(event) {
+    if (event.shiftKey && event.altKey && event.ctrlKey) {
+      return;
+    }
+    if (event.keyCode > 40 || event.keyCode < 37) {
+      return;
+    }
+    event.preventDefault();
+    switch (event.key) {
+      case "ArrowUp":
+        image_process.roi_up();
+        break;
+      case "ArrowDown":
+        image_process.roi_down(image_for_show.rows);
+        break;
+      case "ArrowLeft":
+        image_process.roi_left();
+        break;
+      case "ArrowRight":
+        image_process.roi_right(image_for_show.cols);
+        break;
+    }
+    show_image();
+  }
+
+  /*function mouse_move_roi(event) {
+    if (event.type == "mousedown") {
+      roi_move_tag = true;
+    } else if (event.type == "mouseup") {
+      roi_move_tag = false;
+    }
+  }
+
+  function drag_roi(event) {
+    if (roi_move_tag) {
+      console.log(event);
+      let delta = {
+        x: event.clientX - mouse_move.x,
+        y: event.clientY - mouse_move.y,
+      };
+      image_process.roi_move(delta);
+      mouse_move = {
+        x: event.clientX,
+        y: event.clientY,
+      };
+      show_image();
+    }
+  }*/
+
   onMount(async () => {
     canvas_height = window_height - 64;
     canvas_width = (window_width * 13) / 16;
     init_canvas();
-    console.log(window);
   });
 
   onDestroy(async () => {
     if (image.delete) {
       image.delete();
     }
+    if (image_for_show.delete) {
+      image_for_show.delete();
+    }
   });
 </script>
 
@@ -166,6 +245,7 @@
   bind:innerHeight={window_height}
   bind:innerWidth={window_width}
   on:resize={on_window_resize}
+  on:keydown={keyboard_move_roi}
 />
 
 <div class="disable-selection">
@@ -181,9 +261,7 @@
               <!-- svelte-ignore a11y-click-events-have-key-events -->
               <li>
                 <a
-                  class:is-active={active === item.id}
                   on:click={() => {
-                    active = item.id;
                     if (item.handler) {
                       item.handler();
                     }
@@ -201,7 +279,16 @@
       </aside>
     </div>
     <div class="column" style="text-align:center">
-      <canvas bind:this={canvas_dom} id="canvas" />
+      <div>
+        {#if mask_tag}
+          <Mask {canvas_dom} />
+        {/if}
+        <canvas
+          bind:this={canvas_dom}
+          id="canvas"
+          on:wheel={wheel_event_handler}
+        />
+      </div>
     </div>
   </div>
 </div>
diff --git a/src/lib/ImageShow copy.svelte b/src/lib/ImageShowWithFabric.svelte
similarity index 79%
rename from src/lib/ImageShow copy.svelte
rename to src/lib/ImageShowWithFabric.svelte
index ac3fa9d..40b25e2 100644
--- a/src/lib/ImageShow copy.svelte	
+++ b/src/lib/ImageShowWithFabric.svelte
@@ -1,16 +1,12 @@
 <script>
-  import { v4 as uuidv4 } from "uuid";
   import { onMount } from "svelte";
 
   import { fabric } from "fabric";
 
   import Navbar from "./Navbar.svelte";
-  import { ImageProcessing } from "./utils";
 
   export let url = "test.jpg";
 
-  let img_process = new ImageProcessing();
-
   let canvas_dom;
   let canvas;
   let image;
@@ -18,7 +14,7 @@
   let window_height;
   let canvas_width = 0;
   let canvas_height = 0;
-  let active;
+  let resize_tag;
 
   function LabelItem(label, items) {
     this.label = label;
@@ -29,7 +25,6 @@
   }
 
   function OperationItem(name, icon, handler = null) {
-    this.id = uuidv4();
     this.name = name;
     this.icon = icon;
     this.handler = handler;
@@ -39,20 +34,34 @@
     new LabelItem("采集操作", [
       ["确认并返回", "mdi mdi-checkbox-marked-circle-outline"],
       ["重新采集", "mdi mdi-reply-outline"],
-      ["取消", "mdi mdi-alpha-x-circle-outline"],
     ]),
     new LabelItem("图像操作", [
       [
         "向左旋转",
         "mdi mdi-file-rotate-left-outline",
         () => {
+          console.log("rotate 90");
           image.rotate(90);
         },
       ],
-      ["向右旋转", "mdi mdi-file-rotate-right-outline"],
+      [
+        "向右旋转",
+        "mdi mdi-file-rotate-right-outline",
+        () => {
+          console.log("rotate 270");
+
+          image.rotate(270);
+        },
+      ],
       ["文本加强", "mdi mdi-image-filter-center-focus-strong"],
       ["裁剪", "mdi mdi-crop"],
-      ["滚轮缩放", "mdi mdi-loupe"],
+      [
+        "还原",
+        "mdi mdi-alpha-x-circle-outline",
+        () => {
+          init_canvas();
+        },
+      ],
     ]),
     new LabelItem("文件操作", [
       ["保存到本地", "mdi mdi-content-save-outline"],
@@ -66,7 +75,10 @@
   }
 
   function resize() {
-    setTimeout(() => {
+    if (resize_tag) {
+      clearTimeout(resize_tag);
+    }
+    resize_tag = setTimeout(() => {
       let scale = Math.min(
         canvas_height / image.height,
         canvas_width / image.width
@@ -74,7 +86,7 @@
 
       canvas.setWidth(image.width * scale);
       canvas.setHeight(image.height * scale);
-
+      image.rotate(90);
       image.scale(scale);
     }, 50);
   }
@@ -85,20 +97,17 @@
     img.onload = async function () {
       setTimeout(() => {
         canvas = new fabric.StaticCanvas(canvas_dom);
-        setTimeout(() => {
-          image = new fabric.Image(img);
-          let scale = Math.min(
-            canvas_height / image.height,
-            canvas_width / image.width
-          );
+        image = new fabric.Image(img);
+        let scale = Math.min(
+          canvas_height / image.height,
+          canvas_width / image.width
+        );
 
-          image.scale(scale);
-          canvas.setWidth(image.width * scale);
-          canvas.setHeight(image.height * scale);
-          canvas.add(image);
-          console.log(image);
-        }, 50);
-      });
+        image.scale(scale);
+        canvas.setWidth(image.width * scale);
+        canvas.setHeight(image.height * scale);
+        canvas.add(image);
+      }, 50);
     };
   }
 
@@ -106,7 +115,6 @@
     canvas_height = window_height - 64;
     canvas_width = (window_width * 13) / 16;
     init_canvas();
-    console.log(window)
   });
 </script>
 
@@ -129,9 +137,7 @@
               <!-- svelte-ignore a11y-click-events-have-key-events -->
               <li>
                 <a
-                  class:is-active={active === item.id}
                   on:click={() => {
-                    active = item.id;
                     if (item.handler) {
                       item.handler();
                     }
diff --git a/src/lib/Mask.svelte b/src/lib/Mask.svelte
new file mode 100644
index 0000000..ed71b44
--- /dev/null
+++ b/src/lib/Mask.svelte
@@ -0,0 +1,283 @@
+<script>
+  import { onMount } from "svelte";
+
+  // 应该确定四个点
+  export let canvas_dom;
+
+  let mask_top = canvas_dom.offsetTop;
+  let mask_left = canvas_dom.offsetLeft;
+  let mask_width = canvas_dom.clientWidth;
+  let mask_height = canvas_dom.clientHeight;
+
+  let cursor = "default";
+
+  let crop_tag = false;
+
+  let crop_area = -1;
+
+  let mask_rects = [];
+
+  function get_crop_rect(rects) {
+    if (rects.length == 9) {
+      return {
+        x: rects[4][0] - mask_left,
+        y: rects[4][1] - mask_top,
+        width: rects[4][2],
+        height: rects[4][3],
+      };
+    } else {
+      return {};
+    }
+  }
+
+  export let crop_rect = {};
+
+  let crop_rect_with_offset = {
+    x: mask_left + mask_width * 0.2,
+    y: mask_top,
+    width: mask_width * 0.6,
+    height: mask_height * 0.6,
+  };
+
+  $: {
+    crop_rect = get_crop_rect(mask_rects);
+    console.log(crop_rect);
+  }
+
+  function init_mask_rects() {
+    // TODO:
+    return [
+      [
+        mask_left,
+        mask_top,
+        crop_rect_with_offset.x - mask_left,
+        crop_rect_with_offset.y - mask_top,
+      ],
+      [
+        crop_rect_with_offset.x,
+        mask_top,
+        crop_rect_with_offset.width,
+        crop_rect_with_offset.y - mask_top,
+      ],
+      [
+        crop_rect_with_offset.x + crop_rect_with_offset.width,
+        mask_top,
+        mask_left + mask_width,
+        crop_rect_with_offset.y - mask_top,
+      ],
+      [
+        mask_left,
+        crop_rect_with_offset.y,
+        crop_rect_with_offset.x - mask_left,
+        crop_rect_with_offset.y - mask_top,
+      ],
+      [
+        crop_rect_with_offset.x,
+        crop_rect_with_offset.y,
+        crop_rect_with_offset.width,
+        crop_rect_with_offset.height,
+      ],
+    ];
+  }
+
+  function _set_crop_rect(e) {
+    if (crop_area < 0) {
+      return;
+    }
+    switch (crop_area) {
+      case 0:
+        console.log("mask_rects.4:" + mask_rects[4]);
+        crop_rect_with_offset.x = e.clientX;
+        crop_rect_with_offset.y = e.clientY;
+        crop_rect_with_offset.width =
+          mask_rects[4][2] - (mask_rects[4][0] - e.clientX);
+        crop_rect_with_offset.height =
+          mask_rects[4][3] - (mask_rects[4][1] - e.clientY);
+        mask_rects = init_mask_rects();
+        return;
+      /*mask_rects[4][2] = r4[3] - (r4[0] - e.clientX);
+        mask_rects[4][3] = r4[4] - (r4[1] - e.clientY);
+      case 1:
+        mask_rects[4][1] = e.clientY;
+        mask_rects[4][3] = r4[4] - (r4[1] - e.clientY);*/
+    }
+  }
+
+  function set_crop_rect(e, i) {
+    console.log(crop_tag);
+    if (crop_tag) {
+      _set_crop_rect(e);
+      return;
+    }
+    if (i != 4) {
+      crop_area = -1;
+      return;
+    }
+    if (
+      e.clientX - mask_rects[4][1] <= mask_width * 0.01 &&
+      e.clientY - mask_rects[4][0] <= mask_height * 0.01
+    ) {
+      cursor = "nwse-resize";
+      crop_area = 0;
+      return;
+    }
+    if (e.clientY - mask_rects[4][0] <= mask_height * 0.01) {
+      cursor = "ns-resize";
+      crop_area = 1;
+      return;
+    }
+
+    if (
+      e.clientX - mask_rects[4][1] <= mask_width * 0.01 &&
+      e.clientY - mask_rects[4][0] - mask_rects[4][3] >= -mask_height * 0.01
+    ) {
+      cursor = "nesw-resize";
+      crop_area = 2;
+      return;
+    }
+    if (e.clientX - mask_rects[4][1] <= mask_width * 0.01) {
+      cursor = "ew-resize";
+      crop_area = 3;
+      return;
+    }
+
+    if (e.clientX - mask_rects[4][1] - mask_rects[4][2] >= -mask_width * 0.01) {
+      cursor = "ew-resize";
+      crop_area = 4;
+      return;
+    }
+
+    if (
+      e.clientX - mask_rects[4][1] - mask_rects[4][2] >= -mask_width * 0.01 &&
+      e.clientY - mask_rects[4][0] <= mask_height * 0.01
+    ) {
+      cursor = "nesw-resize";
+      crop_area = 5;
+      return;
+    }
+    if (
+      e.clientY - mask_rects[4][0] - mask_rects[4][3] >=
+      -mask_height * 0.01
+    ) {
+      cursor = "ns-resize";
+      crop_area = 6;
+      return;
+    }
+    if (
+      e.clientX - mask_rects[4][1] - mask_rects[4][2] >= -mask_width * 0.01 &&
+      e.clientY - mask_rects[4][0] - mask_rects[4][3] >= -mask_height * 0.01
+    ) {
+      cursor = "nwse-resize";
+      crop_area = 7;
+      return;
+    }
+    crop_area = -1;
+  }
+
+  onMount(() => {
+    for (let i = 0; i < 9; i++) {
+      mask_rects[i] = [
+        mask_top_pos(i),
+        mask_left_pos(i),
+        mask_width_pos(i),
+        mask_height_pos(i),
+      ];
+    }
+  });
+
+  function mask_top_pos(index) {
+    let k = Math.floor(index / 3);
+    switch (k) {
+      case 0:
+        return mask_top;
+      case 1:
+        return mask_top + mask_height * 0.2;
+      case 2:
+        return mask_top + mask_height * 0.8;
+    }
+  }
+
+  function mask_left_pos(index) {
+    let k = index % 3;
+    switch (k) {
+      case 0:
+        return mask_left;
+      case 1:
+        return mask_left + mask_width * 0.2;
+      case 2:
+        return mask_left + mask_width * 0.8;
+    }
+  }
+
+  function mask_width_pos(index) {
+    let k = index % 3;
+    switch (k) {
+      case 0:
+        return mask_width * 0.2;
+      case 1:
+        return mask_width * 0.6;
+      case 2:
+        return mask_width * 0.2;
+    }
+  }
+
+  function mask_height_pos(index) {
+    let k = Math.floor(index / 3);
+    switch (k) {
+      case 0:
+        return mask_height * 0.2;
+      case 1:
+        return mask_height * 0.6;
+      case 2:
+        return mask_height * 0.2;
+    }
+  }
+</script>
+
+{#each mask_rects as r, i}
+  <!-- svelte-ignore a11y-click-events-have-key-events -->
+  <div
+    class={i != 4 ? "mask" : "mask-center"}
+    style:top={r[0] + "px"}
+    style:left={r[1] + "px"}
+    style:width={r[2] + "px"}
+    style:height={r[3] + "px"}
+    style:cursor
+    on:mousemove={(e) => {
+      set_crop_rect(e, i);
+    }}
+    on:mousedown={() => {
+      if (i == 4) {
+        crop_tag = true;
+      }
+    }}
+    on:mouseup={() => {
+      crop_tag = false;
+    }}
+  >
+    <div class="mask-inner" />
+  </div>
+{/each}
+
+<style>
+  .mask {
+    position: fixed;
+    background-color: gray;
+    opacity: 0.6;
+  }
+
+  .mask-center {
+    position: fixed;
+    border: 2px solid black;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    background-color: red;
+  }
+
+  .mask-inner {
+    width: 98%;
+    height: 98%;
+    cursor: default;
+  }
+</style>
diff --git a/src/lib/Navbar.svelte b/src/lib/Navbar.svelte
index 2485db1..3566a12 100644
--- a/src/lib/Navbar.svelte
+++ b/src/lib/Navbar.svelte
@@ -5,7 +5,7 @@
 
   let user;
   let guide = new RouterGuide();
-  
+
   function logout() {
     guide.push("/login");
   }
diff --git a/src/lib/utils.js b/src/lib/utils.js
index 5899611..a0b82b6 100644
--- a/src/lib/utils.js
+++ b/src/lib/utils.js
@@ -1,5 +1,8 @@
 import procedure from "../assets/Procedure.json";
 
+const cv = window.cv;
+const move_step = 3;
+
 export function Operation(step) {
   this.step = step;
 
@@ -18,11 +21,187 @@ export function Operation(step) {
     if (!s) {
       return procedure.find((e) => e.id === this.step).name;
     }
-    console.log(s);
     return procedure.find((e) => e.id === s).name;
   };
 
   this.get_color = () => {
     return procedure.find((e) => e.id === this.step).color;
   };
-}
\ No newline at end of file
+}
+
+export function ImageProcess() {
+  let angle = 0;
+
+  this.roi_tag = false;
+  this.roi_scale_ratio = 1;
+
+  this.rotate_tag = -1;
+
+  this.ROI_rect = new cv.Rect(0, 0, 0, 0);
+  this.crop_rect = null;
+
+  this.recover = () => {
+    angle = 0;
+    this.roi_tag = false;
+    this.roi_scale_ratio = 1;
+
+    this.rotate_tag = -1;
+
+    this.ROI_rect = new cv.Rect(0, 0, 0, 0);
+    this.crop_rect = null;
+  };
+
+  this.roi_init = () => {
+    this.roi_tag = false;
+    this.roi_scale_ratio = 1;
+
+    this.ROI_rect = new cv.Rect(0, 0, 0, 0);
+  };
+
+  this.roi_move = ({ x, y }) => {
+    if (x >= 0) {
+      this.roi_right(x);
+    } else {
+      this.roi_left(-x);
+    }
+    if (y >= 0) {
+      this.roi_down(y);
+    } else {
+      this.roi_down(-y);
+    }
+  };
+
+  this.roi_up = (step = move_step) => {
+    let x = this.ROI_rect.x;
+    let y = this.ROI_rect.y >= step ? this.ROI_rect.y - step : 0;
+    let width = this.ROI_rect.width;
+    let height = this.ROI_rect.height;
+
+    this.ROI_rect = new cv.Rect(x, y, width, height);
+  };
+
+  this.roi_down = (rows, step = move_step) => {
+    let x = this.ROI_rect.x;
+    let y =
+      this.ROI_rect.y <= rows - this.ROI_rect.height - step
+        ? this.ROI_rect.y + step
+        : rows - this.ROI_rect.height - step;
+    let width = this.ROI_rect.width;
+    let height = this.ROI_rect.height;
+    this.ROI_rect = new cv.Rect(x, y, width, height);
+  };
+
+  this.roi_left = (step = move_step) => {
+    let x = this.ROI_rect.x >= step ? this.ROI_rect.x - step : 0;
+    let y = this.ROI_rect.y;
+    let width = this.ROI_rect.width;
+    let height = this.ROI_rect.height;
+
+    this.ROI_rect = new cv.Rect(x, y, width, height);
+  };
+
+  this.roi_right = (cols, step = move_step) => {
+    let x =
+      this.ROI_rect.x + this.ROI_rect.width + step <= cols
+        ? this.ROI_rect.x + step
+        : cols - this.ROI_rect.width - step;
+    let y = this.ROI_rect.y;
+    let width = this.ROI_rect.width;
+    let height = this.ROI_rect.height;
+    this.ROI_rect = new cv.Rect(x, y, width, height);
+  };
+
+  this.roi = (rows, cols, center, delta_wheel, scale_ratio = 0.05) => {
+    // Transition coordinate system at first.
+    let c_at_image = new cv.Point(
+      center.x * this.roi_scale_ratio + this.ROI_rect.x,
+      center.y * this.roi_scale_ratio + this.ROI_rect.y
+    );
+
+    let ratio = this.roi_scale_ratio + (delta_wheel / 144) * scale_ratio;
+    this.roi_scale_ratio = ratio <= 1 ? ratio : 1;
+
+    if (!this.roi_tag) {
+      this.ROI_rect = new cv.Rect(0, 0, cols, rows);
+      this.roi_tag = true;
+    }
+
+    let roi_width = cols * this.roi_scale_ratio;
+    let roi_height = rows * this.roi_scale_ratio;
+
+    if (Math.min(roi_width / cols, roi_height / rows) <= 0.3) {
+      this.roi_scale_ratio = 0.3;
+      return;
+    }
+
+    let x =
+      c_at_image.x -
+      (c_at_image.x * roi_width) / this.ROI_rect.width +
+      (this.ROI_rect.x * roi_width) / this.ROI_rect.width;
+    let y =
+      c_at_image.y -
+      (c_at_image.y * roi_height) / this.ROI_rect.height +
+      (this.ROI_rect.y * roi_height) / this.ROI_rect.height;
+
+    if (roi_width + x <= cols && roi_height + y <= rows) {
+      this.ROI_rect = new cv.Rect(
+        x >= 0 ? x : 0,
+        y >= 0 ? y : 0,
+        roi_width,
+        roi_height
+      );
+    } else if (roi_width + x <= cols && roi_height + y >= rows) {
+      this.ROI_rect = new cv.Rect(
+        x >= 0 ? x : 0,
+        rows - roi_height,
+        roi_width,
+        roi_height
+      );
+    } else if (roi_width + x >= cols && roi_height + y >= rows) {
+      this.ROI_rect = new cv.Rect(
+        cols - roi_width,
+        rows - roi_height,
+        roi_width,
+        roi_height
+      );
+    }
+  };
+
+  this.turn_left = () => {
+    this.roi_init();
+    angle = angle + 270;
+    let k = angle % 360;
+
+    if (k == 90) {
+      this.rotate_tag = 0;
+    } else if (k == 180) {
+      this.rotate_tag = 1;
+    } else if (k == 270) {
+      this.rotate_tag = 2;
+    } else {
+      this.rotate_tag = -1;
+    }
+  };
+  this.turn_right = () => {
+    this.roi_init();
+
+    angle = angle + 90;
+    let k = angle % 360;
+    if (k == 90) {
+      this.rotate_tag = 0;
+    } else if (k == 180) {
+      this.rotate_tag = 1;
+    } else if (k == 270) {
+      this.rotate_tag = 2;
+    } else {
+      this.rotate_tag = -1;
+    }
+  };
+
+  this.set_roi = (rect) => {
+    this.ROI_rect = rect;
+  };
+  this.set_crop_roi = (rect) => {
+    this.crop_rect = rect;
+  };
+}
diff --git a/src/route/Route.js b/src/route/Route.js
index a0c974e..f695b6d 100644
--- a/src/route/Route.js
+++ b/src/route/Route.js
@@ -4,6 +4,7 @@ import { setContext } from "svelte";
 import Main from "../lib/Main.svelte";
 import Login from "../lib/Login.svelte";
 import Image from "../lib/ImageShow.svelte";
+// import Image from "../lib/ImageShowWithFabric.svelte";
 
 const RouterMap = {
   index: Main,