feat: 不完美的旋转缩放

src/components/webtopo-svgedit/components/center-panel/index.vue

@@ -105,7 +105,17 @@
     IDoneJson
   } from '../../../../store/global/types';
   import { useSvgEditLayoutStore } from '../../../../store/svgedit-layout';
-  import { randomString } from '../../../../utils';
+  import { getCenterPoint, randomString } from '../../../../utils';
+  import {
+    calculateBottom,
+    calculateLeft,
+    calculateLeftBottom,
+    calculateLeftTop,
+    calculateRight,
+    calculateRightBottom,
+    calculateRightTop,
+    calculateTop
+  } from '../../../../utils/scale-core';
   import HandlePanel from '../handle-panel/index.vue';
   // import HandlePanel from '../handle-panel/index.vue';
   const globalStore = useGlobalStore();
@@ -159,6 +169,8 @@
     e.preventDefault();
   };
   const onSvgMouseDown = (select_item: IDoneJson, index: number, e: MouseEvent) => {
+    console.log(172, e);
+
     e.preventDefault();
     e.cancelBubble = true;
     //鼠标在画布上的组件按下记录选中的组件信息和鼠标位置信息等
@@ -192,62 +204,144 @@
       //有选中组件 移动组件
       globalStore.handle_svg_info.info.x = globalStore.mouse_info.new_position_x;
       globalStore.handle_svg_info.info.y = globalStore.mouse_info.new_position_y;
+      globalStore.handle_svg_info.info.client = {
+        x: clientX,
+        y: clientY
+      };
       globalStore.intention = EGlobalStoreIntention.Move;
     } else if (globalStore.intention == EGlobalStoreIntention.MoveCanvas) {
       //移动画布
       svgEditLayoutStore.center_offset.x = globalStore.mouse_info.new_position_x;
       svgEditLayoutStore.center_offset.y = globalStore.mouse_info.new_position_y;
     } else if (globalStore.intention === EGlobalStoreIntention.Zoom) {
+      if (!globalStore.handle_svg_info) {
+        return;
+      }
+      //当前鼠标坐标
+      const curPositon = {
+        x: e.clientX,
+        y: e.clientY
+      };
+      let new_length = {
+        width: 0,
+        height: 0,
+        is_old_width: false,
+        is_old_height: false
+      };
+      if (globalStore.scale_info.type === EScaleInfoType.TopLeft) {
+        new_length = calculateLeftTop(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.TopRight) {
+        new_length = calculateRightTop(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.BottomRight) {
+        new_length = calculateRightBottom(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.BottomLeft) {
+        new_length = calculateLeftBottom(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.TopCenter) {
+        new_length = calculateTop(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate,
+          globalStore.handle_svg_info.info.client
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.Right) {
+        new_length = calculateRight(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate,
+          globalStore.handle_svg_info.info.client
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.BottomCenter) {
+        new_length = calculateBottom(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate,
+          globalStore.handle_svg_info.info.client
+        );
+      } else if (globalStore.scale_info.type === EScaleInfoType.Left) {
+        new_length = calculateLeft(
+          curPositon,
+          globalStore.scale_info.symmetric_point,
+          globalStore.handle_svg_info.info.rotate,
+          globalStore.handle_svg_info.info.client
+        );
+      }
+      console.log('坐标', globalStore.scale_info.symmetric_point, curPositon, new_length);
+
       //缩放
-      const move_length_x =
-        globalStore.scale_info.type === EScaleInfoType.TopLeft ||
-        globalStore.scale_info.type === EScaleInfoType.Left ||
-        globalStore.scale_info.type === EScaleInfoType.BottomLeft
-          ? globalStore.mouse_info.new_position_x - globalStore.mouse_info.now_position_x
-          : globalStore.scale_info.type === EScaleInfoType.TopRight ||
-            globalStore.scale_info.type === EScaleInfoType.Right ||
-            globalStore.scale_info.type === EScaleInfoType.BottomRight
-          ? globalStore.mouse_info.now_position_x - globalStore.mouse_info.new_position_x
-          : 0;
-      const move_length_y =
-        globalStore.scale_info.type === EScaleInfoType.TopLeft ||
-        globalStore.scale_info.type === EScaleInfoType.TopCenter ||
-        globalStore.scale_info.type === EScaleInfoType.TopRight
-          ? globalStore.mouse_info.new_position_y - globalStore.mouse_info.now_position_y
-          : globalStore.scale_info.type === EScaleInfoType.BottomLeft ||
-            globalStore.scale_info.type === EScaleInfoType.BottomCenter ||
-            globalStore.scale_info.type === EScaleInfoType.BottomRight
-          ? globalStore.mouse_info.now_position_y - globalStore.mouse_info.new_position_y
-          : 0;
+      // const move_length_x =
+      //   globalStore.scale_info.type === EScaleInfoType.TopLeft ||
+      //   globalStore.scale_info.type === EScaleInfoType.Left ||
+      //   globalStore.scale_info.type === EScaleInfoType.BottomLeft
+      //     ? -(newTopLeftPoint.x - globalStore.mouse_info.now_position_x)
+      //     : globalStore.scale_info.type === EScaleInfoType.TopRight ||
+      //       globalStore.scale_info.type === EScaleInfoType.Right ||
+      //       globalStore.scale_info.type === EScaleInfoType.BottomRight
+      //     ? globalStore.mouse_info.now_position_x - newTopLeftPoint.x
+      //     : 0;
+      // const move_length_y =
+      //   globalStore.scale_info.type === EScaleInfoType.TopLeft ||
+      //   globalStore.scale_info.type === EScaleInfoType.TopCenter ||
+      //   globalStore.scale_info.type === EScaleInfoType.TopRight
+      //     ? newTopLeftPoint.y - globalStore.mouse_info.now_position_y
+      //     : globalStore.scale_info.type === EScaleInfoType.BottomLeft ||
+      //       globalStore.scale_info.type === EScaleInfoType.BottomCenter ||
+      //       globalStore.scale_info.type === EScaleInfoType.BottomRight
+      //     ? globalStore.mouse_info.now_position_y - newTopLeftPoint.y
+      //     : 0;
       //算出缩放倍数
-      if (globalStore.handle_svg_info) {
-        const scale_x =
-          (globalStore.handle_svg_info.info.actual_bound.width *
-            globalStore.scale_info.scale_times.x -
-            move_length_x) /
-          globalStore.handle_svg_info.info.actual_bound.width;
-        const scale_y =
-          (globalStore.handle_svg_info.info.actual_bound.height *
-            globalStore.scale_info.scale_times.y -
-            move_length_y) /
-          globalStore.handle_svg_info.info.actual_bound.height;
+      if (globalStore.handle_svg_info && new_length.width > 0 && new_length.height > 0) {
+        const scale_x = !new_length.is_old_width
+          ? new_length.width /
+            (globalStore.handle_svg_info.info.actual_bound.width *
+              globalStore.scale_info.scale_times.x)
+          : 1;
+        const scale_y = !new_length.is_old_height
+          ? new_length.height /
+            (globalStore.handle_svg_info.info.actual_bound.height *
+              globalStore.scale_info.scale_times.y)
+          : 1;
+        // const move_length_x =
+        //   new_length.width -
+        //   globalStore.handle_svg_info.info.actual_bound.width *
+        //     globalStore.scale_info.scale_times.x;
+        // const move_length_y =
+        //   new_length.height -
+        //   globalStore.handle_svg_info.info.actual_bound.height *
+        //     globalStore.scale_info.scale_times.y;
         if (scale_x > 0) {
           globalStore.handle_svg_info.info.scale_x = scale_x;
-          globalStore.handle_svg_info.info.x =
-            globalStore.scale_info.type === EScaleInfoType.TopLeft ||
-            globalStore.scale_info.type === EScaleInfoType.Left ||
-            globalStore.scale_info.type === EScaleInfoType.BottomLeft
-              ? globalStore.scale_info.scale_item_info.x + move_length_x / 2
-              : globalStore.scale_info.scale_item_info.x - move_length_x / 2;
+          //现在是沿着中心缩放 后续这里要改下
+          // globalStore.handle_svg_info.info.x =
+          //   globalStore.scale_info.type === EScaleInfoType.TopLeft ||
+          //   globalStore.scale_info.type === EScaleInfoType.Left ||
+          //   globalStore.scale_info.type === EScaleInfoType.BottomLeft
+          //     ? globalStore.scale_info.scale_item_info.x - move_length_x / 2
+          //     : globalStore.scale_info.scale_item_info.x + move_length_x / 2;
         }
         if (scale_y > 0) {
           globalStore.handle_svg_info.info.scale_y = scale_y;
-          globalStore.handle_svg_info.info.y =
-            globalStore.scale_info.type === EScaleInfoType.TopLeft ||
-            globalStore.scale_info.type === EScaleInfoType.TopCenter ||
-            globalStore.scale_info.type === EScaleInfoType.TopRight
-              ? globalStore.scale_info.scale_item_info.y + move_length_y / 2
-              : globalStore.scale_info.scale_item_info.y - move_length_y / 2;
+          // globalStore.handle_svg_info.info.y =
+          //   globalStore.scale_info.type === EScaleInfoType.TopLeft ||
+          //   globalStore.scale_info.type === EScaleInfoType.TopCenter ||
+          //   globalStore.scale_info.type === EScaleInfoType.TopRight
+          //     ? globalStore.scale_info.scale_item_info.y - move_length_y / 2
+          //     : globalStore.scale_info.scale_item_info.y + move_length_y / 2;
         }
       }
     } else if (globalStore.intention === EGlobalStoreIntention.Rotate) {
@@ -270,7 +364,7 @@
         globalStore.rotate_info.angle + rotateDegreeAfter - rotateDegreeBefore;
     }
   };
-  const onCanvasMouseUp = () => {
+  const onCanvasMouseUp = (e: MouseEvent) => {
     //如果鼠标不是按下状态
     if (globalStore.mouse_info.state != EMouseInfoState.Down) {
       return;
@@ -283,6 +377,19 @@
       globalStore.setDoneJson(globalStore.done_json);
       globalStore.intention = EGlobalStoreIntention.Select;
       // globalStore.setHandleSvgInfo(undefined, 0);
+    } else if (
+      globalStore.handle_svg_info?.info &&
+      globalStore.intention == EGlobalStoreIntention.Zoom
+    ) {
+      //缩放完成后重置中点
+      const newCenterPoint = getCenterPoint(
+        { x: e.clientX, y: e.clientY },
+        globalStore.scale_info.symmetric_point
+      );
+      //这里有bug 要先把移动的时候不根据中点放大 这里才好用
+      console.log(newCenterPoint);
+      globalStore.handle_svg_info.info.client = newCenterPoint;
+      globalStore.intention = EGlobalStoreIntention.None;
     } else if (globalStore.intention != EGlobalStoreIntention.Select) {
       globalStore.intention = EGlobalStoreIntention.None;
     }

src/components/webtopo-svgedit/components/handle-panel/index.vue

@@ -163,6 +163,15 @@
       scale_item_info: {
         x: props.itemInfo.x,
         y: props.itemInfo.y
+      },
+      symmetric_point: {
+        x:
+          props.itemInfo.client.x +
+          Math.abs(clientX - props.itemInfo.client.x) *
+            (clientX < props.itemInfo.client.x ? 1 : -1),
+        y:
+          props.itemInfo.client.y +
+          Math.abs(clientY - props.itemInfo.client.y) * (clientY < props.itemInfo.client.y ? 1 : -1)
       }
     });
   };

src/store/global/index.ts

@@ -41,6 +41,10 @@ export const useGlobalStore = defineStore('global-store', {
         scale_item_info: {
           x: 0,
           y: 0
+        },
+        symmetric_point: {
+          x: 0,
+          y: 0
         }
       },
       rotate_info: {

src/store/global/types.ts

@@ -68,6 +68,11 @@ export interface IScaleInfo {
     x: number;
     y: number;
   };
+  symmetric_point: {
+    //缩放前缩放手柄对应组件中心坐标的对称点坐标
+    x: number;
+    y: number;
+  };
 }
 /**
  * 旋转信息

src/utils/index.ts

@@ -26,3 +26,49 @@ export const isOfType = <T>(target: unknown, prop: keyof T): target is T => {
 export const getCoordinateOffset = (length: number, scale: number) => {
   return (length / 2) * (scale - 1);
 };
+// 角度转弧度
+// Math.PI = 180 度
+export const angleToRadian = (angle: number) => {
+  return (angle * Math.PI) / 180;
+};
+/**
+ * 计算根据圆心旋转后的点的坐标
+ * @param   {Object}  point  旋转前的点坐标
+ * @param   {Object}  center 旋转中心
+ * @param   {Number}  rotate 旋转的角度
+ * @return  {Object}         旋转后的坐标
+ * https://www.zhihu.com/question/67425734/answer/252724399 旋转矩阵公式
+ */
+export const calculateRotatedPointCoordinate = (
+  point: { x: number; y: number },
+  center: { x: number; y: number },
+  rotate: number
+) => {
+  /**
+   * 旋转公式：
+   *  点a(x, y)
+   *  旋转中心c(x, y)
+   *  旋转后点n(x, y)
+   *  旋转角度θ                tan ??
+   * nx = cosθ * (ax - cx) - sinθ * (ay - cy) + cx
+   * ny = sinθ * (ax - cx) + cosθ * (ay - cy) + cy
+   */
+
+  return {
+    x:
+      (point.x - center.x) * Math.cos(angleToRadian(rotate)) -
+      (point.y - center.y) * Math.sin(angleToRadian(rotate)) +
+      center.x,
+    y:
+      (point.x - center.x) * Math.sin(angleToRadian(rotate)) +
+      (point.y - center.y) * Math.cos(angleToRadian(rotate)) +
+      center.y
+  };
+};
+// 求两点之间的中点坐标
+export const getCenterPoint = (p1: { x: number; y: number }, p2: { x: number; y: number }) => {
+  return {
+    x: p1.x + (p2.x - p1.x) / 2,
+    y: p1.y + (p2.y - p1.y) / 2
+  };
+};

src/utils/scale-core.ts

@@ -0,0 +1,225 @@
+import { calculateRotatedPointCoordinate, getCenterPoint } from '.';
+import { IScalePoint } from './types';
+/**
+ * 左上角缩放
+ * @param curPositon 按住的缩放按钮的坐标
+ * @param symmetricPoint 缩放前对称点的坐标
+ * @param rotate 旋转角度
+ * @returns
+ */
+export const calculateLeftTop = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number
+) => {
+  //新的中心点坐标
+  const newCenterPoint = getCenterPoint(curPositon, symmetricPoint);
+  console.log('left中心坐标', newCenterPoint);
+  const newTopLeftPoint = calculateRotatedPointCoordinate(curPositon, newCenterPoint, -rotate);
+  const newBottomRightPoint = calculateRotatedPointCoordinate(
+    symmetricPoint,
+    newCenterPoint,
+    -rotate
+  );
+
+  return {
+    width: newBottomRightPoint.x - newTopLeftPoint.x,
+    height: newBottomRightPoint.y - newTopLeftPoint.y,
+    is_old_width: false,
+    is_old_height: false
+  };
+};
+/**
+ * 右上角缩放
+ * @param curPositon 按住的缩放按钮的坐标
+ * @param symmetricPoint 缩放前对称点的坐标
+ * @param rotate 旋转角度
+ * @returns
+ */
+export const calculateRightTop = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number
+) => {
+  const newCenterPoint = getCenterPoint(curPositon, symmetricPoint);
+  const newTopRightPoint = calculateRotatedPointCoordinate(curPositon, newCenterPoint, -rotate);
+  const newBottomLeftPoint = calculateRotatedPointCoordinate(
+    symmetricPoint,
+    newCenterPoint,
+    -rotate
+  );
+
+  return {
+    width: newTopRightPoint.x - newBottomLeftPoint.x,
+    height: newBottomLeftPoint.y - newTopRightPoint.y,
+    is_old_width: false,
+    is_old_height: false
+  };
+};
+/**
+ * 右下角缩放
+ * @param curPositon 按住的缩放按钮的坐标
+ * @param symmetricPoint 缩放前对称点的坐标
+ * @param rotate 旋转角度
+ * @returns
+ */
+export const calculateRightBottom = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number
+) => {
+  const newCenterPoint = getCenterPoint(curPositon, symmetricPoint);
+  const newTopLeftPoint = calculateRotatedPointCoordinate(symmetricPoint, newCenterPoint, -rotate);
+  const newBottomRightPoint = calculateRotatedPointCoordinate(curPositon, newCenterPoint, -rotate);
+
+  return {
+    width: newBottomRightPoint.x - newTopLeftPoint.x,
+    height: newBottomRightPoint.y - newTopLeftPoint.y,
+    is_old_width: false,
+    is_old_height: false
+  };
+};
+/**
+ * 左下角缩放
+ * @param curPositon 按住的缩放按钮的坐标
+ * @param symmetricPoint 缩放前对称点的坐标
+ * @param rotate 旋转角度
+ * @returns
+ */
+export const calculateLeftBottom = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number
+) => {
+  const newCenterPoint = getCenterPoint(curPositon, symmetricPoint);
+  const newTopRightPoint = calculateRotatedPointCoordinate(symmetricPoint, newCenterPoint, -rotate);
+  const newBottomLeftPoint = calculateRotatedPointCoordinate(curPositon, newCenterPoint, -rotate);
+
+  return {
+    width: newTopRightPoint.x - newBottomLeftPoint.x,
+    height: newBottomLeftPoint.y - newTopRightPoint.y,
+    is_old_width: false,
+    is_old_height: false
+  };
+};
+
+export const calculateTop = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number,
+  curPoint: IScalePoint
+) => {
+  // 由于用户拉伸时是以任意角度拉伸的，所以在求得旋转前的坐标时，只取 y 坐标（这里的 x 坐标可能是任意值），x 坐标用 curPoint 的。
+  // 这个中心点（第二个参数）用 curPoint, center, symmetricPoint 都可以，只要他们在一条直线上就行
+  const rotatedcurPositon = calculateRotatedPointCoordinate(curPositon, curPoint, -rotate);
+  console.log('top中心坐标', rotatedcurPositon);
+
+  // 算出旋转前 y 坐标，再用 curPoint 的 x 坐标，重新计算它们旋转后对应的坐标
+  const rotatedTopMiddlePoint = calculateRotatedPointCoordinate(
+    {
+      x: curPoint.x,
+      y: rotatedcurPositon.y
+    },
+    curPoint,
+    rotate
+  );
+
+  // 用旋转后的坐标和对称点算出新的高度（勾股定理）
+  const newHeight = Math.sqrt(
+    (rotatedTopMiddlePoint.x - symmetricPoint.x) ** 2 +
+      (rotatedTopMiddlePoint.y - symmetricPoint.y) ** 2
+  );
+  return {
+    width: 1,
+    height: Math.round(newHeight),
+    is_old_width: true,
+    is_old_height: false
+  };
+};
+
+export const calculateRight = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number,
+  curPoint: IScalePoint
+) => {
+  const rotatedcurPositon = calculateRotatedPointCoordinate(curPositon, curPoint, -rotate);
+  const rotatedRightMiddlePoint = calculateRotatedPointCoordinate(
+    {
+      x: rotatedcurPositon.x,
+      y: curPoint.y
+    },
+    curPoint,
+    rotate
+  );
+
+  const newWidth = Math.sqrt(
+    (rotatedRightMiddlePoint.x - symmetricPoint.x) ** 2 +
+      (rotatedRightMiddlePoint.y - symmetricPoint.y) ** 2
+  );
+
+  return {
+    width: Math.round(newWidth),
+    height: 1,
+    is_old_width: false,
+    is_old_height: true
+  };
+};
+
+export const calculateBottom = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number,
+  curPoint: IScalePoint
+) => {
+  const rotatedcurPositon = calculateRotatedPointCoordinate(curPositon, curPoint, -rotate);
+  const rotatedBottomMiddlePoint = calculateRotatedPointCoordinate(
+    {
+      x: curPoint.x,
+      y: rotatedcurPositon.y
+    },
+    curPoint,
+    rotate
+  );
+
+  const newHeight = Math.sqrt(
+    (rotatedBottomMiddlePoint.x - symmetricPoint.x) ** 2 +
+      (rotatedBottomMiddlePoint.y - symmetricPoint.y) ** 2
+  );
+
+  return {
+    width: 1,
+    height: Math.round(newHeight),
+    is_old_width: true,
+    is_old_height: false
+  };
+};
+
+export const calculateLeft = (
+  curPositon: IScalePoint,
+  symmetricPoint: IScalePoint,
+  rotate: number,
+  curPoint: IScalePoint
+) => {
+  const rotatedcurPositon = calculateRotatedPointCoordinate(curPositon, curPoint, -rotate);
+  const rotatedLeftMiddlePoint = calculateRotatedPointCoordinate(
+    {
+      x: rotatedcurPositon.x,
+      y: curPoint.y
+    },
+    curPoint,
+    rotate
+  );
+
+  const newWidth = Math.sqrt(
+    (rotatedLeftMiddlePoint.x - symmetricPoint.x) ** 2 +
+      (rotatedLeftMiddlePoint.y - symmetricPoint.y) ** 2
+  );
+
+  return {
+    width: Math.round(newWidth),
+    height: 1,
+    is_old_width: false,
+    is_old_height: true
+  };
+};

src/utils/types.ts

@@ -0,0 +1,4 @@
+export interface IScalePoint {
+  x: number;
+  y: number;
+}