图编辑类 ImageEditItem 示例

目录

• 绘制示例
• 源代码
• 代码说明
  • 1 当 LineEditItem 为编辑状态时，需要将 LineEditItem 赋给 grabItem
  • 2 当 LineEditItem 为正常状态时，需要将 grabItem 置为 null
  • 3 当 LineEditItem 为试图垂直水平绘制时需要修改 verAndLeve 属性
  • 4 当 LineEditItem 修改属性但是画板尚未变化时需要刷新
• 交互要求

绘制示例

属性修改

字号:

文本框:

线颜色:

示例代码

<template>
  <div class="edit-line">
    <!-- 所有按钮 -->
    <div class="btn-list">
    </div>
    <div class="content">
      <div class="left" id="left">
        <!-- <textarea name="" class="text" cols="30" rows="10"></textarea> -->
        <canvas id="edit_polygon" width="700" height="460" tabindex="0" />
      </div>
      <div class="line-property">
        <el-card shadow="always">
          <div slot="header" class="clearfix">
            <span>属性修改</span>
          </div>
          <div class="always-item">
            <span>字号:</span>
            <el-input-number size="small" v-model="size" @change="updateSize" :min="1" :max="50"></el-input-number>
          </div>
          <div class="always-item">
            <span>文本框:</span>
            <el-input
              v-model="text"
              @change="handleChangeText"
              type="textarea"
              :autosize="{ minRows: 1, maxRows: 1}"
              placeholder="请输入内容"
              style="width:200px;"
            ></el-input>
          </div>
          <div class="always-item">
            <span>线颜色:</span>
            <el-color-picker v-model="color" @change="changeColor" show-alpha></el-color-picker>
          </div>
        </el-card>
      </div>
    </div>
  </div>
</template>

<script>
import {
  SGraphScene,
  SGraphView,
  SGraphPropertyCommand,
  SGraphMoveCommand
} from "@persagy-web/graph/";
import { SUndoStack } from "@persagy-web/base/lib";
import { SFont } from "@persagy-web/draw/lib";
import { SPoint, SColor } from "@persagy-web/draw/";
//注： 开发者引入 SImageItem 包为： import {SImageItem} from "@persagy-web/edit/";
import { EditText } from "./../../../../../guides/edit/items/src/EditText";
import { hexify } from "./../../../../public/until/rgbaUtil";
class SScene extends SGraphScene {
  undoStack = new SUndoStack();
  textItem = new EditText(null);

  constructor() {
    super();
    this.textItem.moveable = true;
    this.textItem.x = 100;
    this.textItem.y = 100;
    this.addItem(this.textItem);
    this.textItem.connect("onMove", this, this.onItemMove.bind(this));
  }

  updateText(str) {
    if (this.textItem.text !== str) {
      let old = this.textItem.text;
      this.textItem.text = str;
      this.undoStack.push(
        new SGraphPropertyCommand(this, this.textItem, "text", old, str)
      );
    }
  }

  updateColor(color) {
    if (this.textItem.color !== color) {
      let old = this.textItem.color;
      this.textItem.color = color;
      this.undoStack.push(
        new SGraphPropertyCommand(this, this.textItem, "color", old, color)
      );
    }
  }

  updateSize(size) {
    if (this.textItem.font.size !== size) {
      let old = new SFont(this.textItem.font);
      let font = new SFont(this.textItem.font);
      font.size = size;
      this.textItem.font = font;
      this.undoStack.push(
        new SGraphPropertyCommand(this, this.textItem, "font", old, font)
      );
    }
  }

  onItemMove(item, ...arg) {
    this.undoStack.push(
      new SGraphMoveCommand(this, item, arg[0][0], arg[0][1])
    );
  }
}

class TestView extends SGraphView {
  constructor() {
    super("edit_polygon");
  }
}

export default {
  name: "edittext",
  data() {
    return {
      scene: new SScene(),
      text: "测试文本",
      size: 20,
      color: "#333333"
    };
  },
  mounted() {
    let view = new TestView();
    this.scene.updateText(this.text);
    this.scene.updateColor(this.color);
    this.scene.updateSize(this.size);
    view.scene = this.scene;
    // this.scene.onMouseUp = this.onMouseUp;
  },
  methods: {
    handleChangeText(text) {
      this.scene.updateText(text);
    },
    handleChangeColor(color) {
      this.scene.updateColor(color);
    },
    updateSize(size) {
      this.scene.updateSize(size);
    },
    undo() {
      this.scene.undoStack.undo();
    },
    redo() {
      this.scene.undoStack.redo();
    },
    reset() {
      this.text = "测试文本";
      this.size = 20;
      this.color = "#333333";
      this.scene.updateText(this.text);
      this.scene.updateColor(this.color);
      this.scene.updateSize(this.size);
    },
    // 改变颜色
    changeColor(val) {
      this.scene.updateColor(hexify(val));
    },
    ///////////////////////////////////
    //// 以下为测试代码，请忽略
    // 设置tooltip位置
    /**
     * raduis 灵敏范围
     * e 鼠标事件对象
     * tipDom 浮动得dom
     * boxDom 最外层盒子
     * offset 偏移量
     */
    toolTipPosition(radius, e, tipDom, offset = 0) {
      // 滚动高度
      const screenTop =
        document.documentElement.scrollTop || document.body.scrollTop;
      const screenLeft =
        document.documentElement.scrollLeft || document.body.scrollLeft;
      radius = radius + offset;
      const mapBox = document.getElementById("edit_polygon");
      // 测试边界mousePosition =  1(右下) 2 （右上）3 （左上） 4 （左下）
      const mousePosition = this.Boxboundary(radius, e, mapBox);
      const absPosition = this.offsetTL(mapBox);
      const absPositionLeft = absPosition.left;
      const absPositionTop = absPosition.top;
      const mClientY = e.clientY + screenTop;
      const mClientX = e.clientX + screenLeft;
      const fuzzy_model_width = tipDom.offsetWidth;
      const fuzzy_model_height = tipDom.offsetHeight;
      // let  offsetTL
      if (mousePosition == 2) {
        tipDom.style.left = `${mClientX - absPositionLeft + offset}px`;
        tipDom.style.top = `${mClientY -
          fuzzy_model_height -
          absPositionTop -
          offset}px`;
      } else if (mousePosition == 3) {
        tipDom.style.left = `${mClientX -
          fuzzy_model_width -
          absPositionLeft -
          offset}px`;
        tipDom.style.top = `${mClientY -
          fuzzy_model_height -
          absPositionTop -
          offset}px`;
      } else if (mousePosition == 4) {
        tipDom.style.left = `${mClientX -
          fuzzy_model_width -
          absPositionLeft -
          offset}px`;
        tipDom.style.top = `${mClientY - absPositionTop + offset}px`;
      } else {
        tipDom.style.left = `${mClientX - absPositionLeft + offset}px`;
        tipDom.style.top = `${mClientY - absPositionTop + offset}px`;
      }
    },
    Boxboundary(radius, event, box) {
      const screenTop =
        document.documentElement.scrollTop || document.body.scrollTop;
      const boxWidth = Number(box.style.width.slice(0, -2));
      const boxHeight = Number(box.style.height.slice(0, -2));
      const absPosition = this.offsetTL(box);
      const boxClientX = absPosition.left;
      const boxClientY = absPosition.top;
      const mouseX = event.clientX;
      const mouseY = event.clientY + screenTop;
      if (mouseY >= boxClientY + boxHeight - radius) {
        if (mouseX <= radius + boxClientX) {
          return 2;
        } else if (mouseX >= boxClientX + boxWidth - radius) {
          return 3;
        } else {
          return 2;
        }
      } else if (mouseX >= boxClientX + boxWidth - radius) {
        return 4;
      } else {
        return 1;
      }
    },
    offsetTL(obj) {
      //获取到body的offsetTop和offsetLeft
      var t = 0,
        l = 0;
      while (obj) {
        t = t + obj.offsetTop;
        l = l + obj.offsetLeft;
        obj = obj.offsetParent;
      }
      return {
        top: t,
        left: l
      };
    },
    onMouseUp(event) {
      const dom = "<textarea autofocus ref='textarea' class='text'></textarea>";
      let parentDom = document.getElementById("left");
      parentDom.innerHTML = parentDom.innerHTML + dom;
      const textareaDom = this.$refs.textarea;
      // console.log('textareaDom',parentDom.children[0])
      this.toolTipPosition(1, event, textareaDom, 0);
    }
  },
  watch: {
    // cmdStatus(val) {
    //   this.scene.cmdStatus = val;
    // }
  }
};
</script>

<style scoped lang="less">
.text {
  overflow: auto;
  word-break: break-all;
  outline: none;
  // background: #409eff;
  position: absolute;
  left: 0;
  top: 0;
}
.edit-line {
  width: 100%;
  height: 500px;
  position: relative;
  .content {
    display: flex;
    justify-content: flex-start;
    .left {
      margin-right: 20px;
    }
    .line-property {
      width: 300px;
      margin-top: 20px;
      .always {
        width: 100%;
        height: 100%;
      }
      .always-item {
        display: flex;
        margin-top: 10px;
        justify-content: space-between;
      }
    }
  }
  .heightLight {
    color: #409eff;
    border-color: #c6e2ff;
    background-color: #ecf5ff;
  }
}
</style>

源代码

查看代码

import { SColor, SLine, SPainter, SPoint, SRect } from "@persagy-web/draw/";
import { SMouseButton, SMouseEvent, SUndoStack } from "@persagy-web/base";
import { SMathUtil } from "@persagy-web/big/lib/utils/SMathUtil";
import { SItemStatus } from "@persagy-web/big";
import {
    SGraphItem,
    SGraphPointListInsert,
    SGraphPointListUpdate,
    SLineStyle
} from "@persagy-web/graph/";

/**
 * 编辑类直线 item
 *
 * @author  韩耀龙(han_yao_long@163.com)
 * */

export class EditLineItem extends SGraphItem {
    /** X坐标最小值  */
    private minX = Number.MAX_SAFE_INTEGER;
    /** X坐标最大值  */
    private maxX = Number.MIN_SAFE_INTEGER;
    /** Y坐标最小值  */
    private minY = Number.MAX_SAFE_INTEGER;
    /** Y坐标最大值  */
    private maxY = Number.MIN_SAFE_INTEGER;

    /** 线段   */
    private _line: SPoint[] = [];
    get line(): SPoint[] {
        return this._line;
    }
    set line(arr: SPoint[]) {
        this._line = arr;
        this.update();
    }

    /** 是否垂直水平绘制   */
    private _verAndLeve: Boolean= false;
    get verAndLeve(): Boolean {
        return this._verAndLeve;
    }
    set verAndLeve(bool: Boolean) {
        this._verAndLeve = bool;
        this.update();
    }

    /** 是否完成绘制  */
    protected _status: SItemStatus = SItemStatus.Normal;
    get status(): SItemStatus {
        return this._status;
    }
    set status(v: SItemStatus) {
        this._status = v;
        this.undoStack.clear();
        this.update();
    }

    /** 线条颜色    */
    private _strokeColor: SColor = SColor.Black;
    get strokeColor(): SColor {
        return this._strokeColor;
    }
    set strokeColor(v: SColor) {
        this._strokeColor = v;
        this.update();
    }

    /** 线条样式    */
    private _lineStyle: SLineStyle = SLineStyle.Solid;
    get lineStyle(): SLineStyle {
        return this._lineStyle;
    }
    set lineStyle(v: SLineStyle) {
        this._lineStyle = v;
        this.update();
    }

    /** 端点填充色 */
    private _fillColor: SColor = SColor.White;
    get fillColor(): SColor {
        return this._fillColor;
    }
    set fillColor(v: SColor) {
        this._fillColor = v;
        this.update();
    }

    /** 选中端点填充色 */
    private _activeFillColor: SColor = new SColor("#2196f3");
    get activeFillColor(): SColor {
        return this._activeFillColor;
    }
    set activeFillColor(v: SColor) {
        this._activeFillColor = v;
        this.update();
    }

    /** 线条宽度    */
    private _lineWidth: number = 1;
    get lineWidth(): number {
        return this._lineWidth;
    }
    set lineWidth(v: number) {
        this._lineWidth = v;
        this.update();
    }

    /** 拖动灵敏度   */
    dis: number = 5;

    /** 拖动灵敏度   */
    private sceneDis: number = 5;

    /** 当前点索引   */
    curIndex: number = -1;

    /** 当前点坐标   */
    private curPoint: SPoint | null = null;

    /** undo/redo堆栈 */
    private undoStack: SUndoStack = new SUndoStack();

    /**
     * 构造函数
     *
     * @param   parent  父级
     * */
    constructor(parent: SGraphItem | null);

    /**
     * 构造函数
     *
     * @param   parent  父级
     * @param   line    坐标集合
     * */
    constructor(parent: SGraphItem | null, line: SPoint[]);

    /**
     * 构造函数
     *
     * @param   parent  父级
     * @param   point   第一个点坐标
     * */
    constructor(parent: SGraphItem | null, point: SPoint);

    /**
     * 构造函数
     *
     * @param   parent  父级
     * @param   l       坐标集合|第一个点坐标
     * */
    constructor(parent: SGraphItem | null, l?: SPoint | SPoint[]) {
        super(parent);
        if (l) {
            if (l instanceof SPoint) {
                this.line.push(l);
            } else {
                this.line = l;
            }
        } else {
            this.line = [];
        }
    }

    /**
     * 添加点至数组中
     *
     * @param   p       添加的点
     * */
    private addPoint(p: SPoint): void {
        if (this.line.length < 2) {
            this.line.push(p);
            this.recordAction(SGraphPointListInsert, [this.line, p]);
        } else {
            this.line[1] = p;
            this.recordAction(SGraphPointListInsert, [this.line, p, 1]);
            this.status = SItemStatus.Normal;
            this.releaseItem();
            this.$emit("finishCreated");
        }
        this.update();
    } // Function addPoint()

    /**
     * 鼠标双击事件
     *
     * @param	event         事件参数
     * @return	boolean
     */
    onDoubleClick(event: SMouseEvent): boolean {
        if (this.status == SItemStatus.Normal) {
            this.status = SItemStatus.Edit;
            this.grabItem(this);
        } else if (this.status == SItemStatus.Edit) {
            this.status = SItemStatus.Normal;
            this.releaseItem();
        }
        this.update();
        return true;
    } // Function onDoubleClick()

    /**
     * 鼠标按下事件
     *
     * @param   event   鼠标事件
     * @return  是否处理事件
     * */
    onMouseDown(event: SMouseEvent): boolean {
        this.curIndex = -1;
        this.curPoint = null;
        if (event.shiftKey || this._verAndLeve) {
            event = this.compare(event);
        }
        if (event.buttons == SMouseButton.LeftButton) {
            if (this.status == SItemStatus.Normal) {
                return super.onMouseDown(event);
            } else if (this.status == SItemStatus.Edit) {
                // 判断是否点击到端点上(获取端点索引值)
                this.findNearestPoint(new SPoint(event.x, event.y));
            } else if (this.status == SItemStatus.Create) {
                this.addPoint(new SPoint(event.x, event.y));
                return true;
            }
        }
        return true;
    } // Function onMouseDown()

    /**
     * 鼠标抬起事件
     *
     * @param	event         事件参数
     * @return	boolean
     */
    onMouseUp(event: SMouseEvent): boolean {
        if (this.status == SItemStatus.Edit) {
            if (this.curIndex > -1) {
                const p = new SPoint(
                    this.line[this.curIndex].x,
                    this.line[this.curIndex].y
                );
                this.recordAction(SGraphPointListUpdate, [
                    this.line,
                    this.curPoint,
                    p,
                    this.curIndex
                ]);
            }
        } else if (this.status == SItemStatus.Normal) {
            this.moveToOrigin(this.x, this.y);
            return super.onMouseUp(event);
        }
        this.curIndex = -1;
        this.curPoint = null;
        return true;
    } // Function onMouseUp()

    /**
     * 鼠标移动事件
     *
     * @param   event   鼠标事件
     * @return  是否处理事件
     * */
    onMouseMove(event: SMouseEvent): boolean {
        if (event.shiftKey || this._verAndLeve) {
            event = this.compare(event);
        }
        if (this.status == SItemStatus.Create) {
            if (this.line[0] instanceof SPoint) {
                this.line[1] = new SPoint(event.x, event.y);
            }
        } else if (this.status == SItemStatus.Edit) {
            if (-1 != this.curIndex) {
                this.line[this.curIndex].x = event.x;
                this.line[this.curIndex].y = event.y;
            }
        } else {
            return super.onMouseMove(event);
        }
        this.update();
        return true;
    } // Function onMouseMove()

    /**
     * 获取点击点与Point[]中的点距离最近点
     *
     * @param   p   鼠标点击点
     * */
    findNearestPoint(p: SPoint): void {
        let len = this.sceneDis;
        for (let i = 0; i < this.line.length; i++) {
            let dis = SMathUtil.pointDistance(
                p.x,
                p.y,
                this.line[i].x,
                this.line[i].y
            );
            if (dis < len) {
                len = dis;
                this.curIndex = i;
                this.curPoint = new SPoint(this.line[this.curIndex]);
            }
        }
    } // Function findNearestPoint()

    /**
     * 记录相关动作并推入栈中
     *
     * @param	SGraphCommand   相关命令类
     * @param	any             对应传入参数
     */
    protected recordAction(SGraphCommand: any, any: any[]): void {
        // 记录相关命令并推入堆栈中
        const command = new SGraphCommand(this.scene, this, ...any);
        this.undoStack.push(command);
    } // Function recordAction()

    /**
     * 移动后处理所有坐标,并肩原点置为场景原点
     *
     * @param   x   x坐标
     * @param   y   y坐标
     * */
    moveToOrigin(x: number, y: number): void {
        super.moveToOrigin(x, y);
        this.line = this.line.map(t => {
            t.x = t.x + x;
            t.y = t.y + y;
            return t;
        });
        this.x = 0;
        this.y = 0;
    } // Function moveToOrigin()

    /**
     * shift垂直水平创建或编辑
     *
     * @param   event   事件
     * */
    compare(event: SMouseEvent): SMouseEvent {
        if (this.line.length) {
            let last = new SPoint(event.x, event.y);
            if (this.status == SItemStatus.Create) {
                last = this.line[0];
            } else if (this.status == SItemStatus.Edit) {
                if (this.curIndex == 1) {
                    last = this.line[0];
                } else if (this.curIndex == 0) {
                    last = this.line[1];
                }
            }
            const dx = Math.abs(event.x - last.x);
            const dy = Math.abs(event.y - last.y);
            if (dy > dx) {
                event.x = last.x;
            } else {
                event.y = last.y;
            }
        }
        return event;
    } // Function compare()

    /**
     * 判断点是否在区域内
     *
     * @param   x
     * @param   y
     * @return  true-是
     */
    contains(x: number, y: number): boolean {
        if (this.line.length == 2) {
            let p = new SPoint(x, y);
            if (
                SMathUtil.pointToLine(p, new SLine(this.line[0], this.line[1]))
                    .MinDis < this.dis
            ) {
                return true;
            }
        }
        return false;
    } // Function contains()

    /**
     * 撤销操作
     *
     */
    undo(): void {
        if (this.status != SItemStatus.Normal) {
            this.undoStack.undo();
        }
    } // Function undo()

    /**
     * 重做操作
     *
     */
    redo(): void {
        if (this.status != SItemStatus.Normal) {
            this.undoStack.redo();
        }
    } // Function redo()

    /**
     * 取消操作item事件
     *
     * */
    cancelOperate(): void {
        if (this.status == SItemStatus.Create) {
            this.parent = null;
            this.releaseItem();
        } else if (this.status == SItemStatus.Edit) {
            this.status = SItemStatus.Normal;
            this.releaseItem();
        }
    } // Function cancelOperate()

    /**
     * Item对象边界区域
     *
     * @return	SRect
     */
    boundingRect(): SRect {
        if (this.line.length) {
            this.minX = this.line[0].x;
            this.maxX = this.line[0].x;
            this.minY = this.line[0].y;
            this.maxY = this.line[0].y;
            this.line.forEach(it => {
                let x = it.x,
                    y = it.y;
                if (x < this.minX) {
                    this.minX = x;
                }
                if (y < this.minY) {
                    this.minY = y;
                }
                if (x > this.maxX) {
                    this.maxX = x;
                }
                if (y > this.maxY) {
                    this.maxY = y;
                }
            });
        }
        return new SRect(
            this.minX,
            this.minY,
            this.maxX - this.minX,
            this.maxY - this.minY
        );
    } // Function boundingRect()

    /**
     * Item绘制操作
     *
     * @param   painter painter对象
     */
    onDraw(painter: SPainter): void {
        this.sceneDis = painter.toPx(this.dis);
        painter.pen.lineWidth = painter.toPx(this.lineWidth);
        painter.pen.color = this.strokeColor;
        if (this.line.length == 2) {
            // 绘制直线
            painter.pen.color = new SColor(this.strokeColor);
            if (this.lineStyle == SLineStyle.Dashed) {
                painter.pen.lineDash = [
                    painter.toPx(this.lineWidth * 3),
                    painter.toPx(this.lineWidth * 7)
                ];
            } else if (this.lineStyle == SLineStyle.Dotted) {
                painter.pen.lineDash = [
                    painter.toPx(this.lineWidth),
                    painter.toPx(this.lineWidth)
                ];
            }
            if (this.selected && this.status == SItemStatus.Normal) {
                painter.pen.lineWidth = painter.toPx(this.lineWidth * 2);
                painter.shadow.shadowBlur = 10;
                painter.shadow.shadowColor = new SColor(`#00000033`);
                painter.shadow.shadowOffsetX = 5;
                painter.shadow.shadowOffsetY = 5;
            }
            painter.drawLine(this.line[0], this.line[1]);
            if (
                this.status == SItemStatus.Edit ||
                this.status == SItemStatus.Create
            ) {
                // 绘制端点
                this.line.forEach((p, i): void => {
                    painter.brush.color = this.fillColor;
                    if (i == this.curIndex) {
                        painter.brush.color = this.activeFillColor;
                    }
                    painter.drawCircle(p.x, p.y, painter.toPx(5));
                });
            }
        } else if (this.line.length == 1) {
            if (
                this.status == SItemStatus.Edit ||
                this.status == SItemStatus.Create
            ) {
                // 绘制端点
                painter.brush.color = this.fillColor;
                painter.drawCircle(
                    this.line[0].x,
                    this.line[0].y,
                    painter.toPx(5)
                );
            }
        }
    } // Function onDraw()
} // Class SLineItem

代码说明

1 当 LineEditItem 为编辑状态时，需要将 LineEditItem 赋给 grabItem

 // 编辑状态时的 LineItem
 this.lineItem = new EditLineItem(null, []);
 this.lineItem.status = SItemStatus.Create;
 this.scene.grabItem = this.lineItem;

2 当 LineEditItem 为正常状态时，需要将 grabItem 置为 null

 // 正常状态时的 LineItem
 this.lineItem = new EditLineItem(null, []);
 this.lineItem.status = SItemStatus.Normal;
 this.scene.grabItem = null;

3 当 LineEditItem 为试图垂直水平绘制时需要修改 verAndLeve 属性

 // 编辑状态时的 LineItem
 this.lineItem = new EditLineItem(null, []);
 this.lineItem.status = SItemStatus.Create;
 this.lineItem.verAndLeve = true;
 this.scene.grabItem = this.lineItem;

4 当 LineEditItem 修改属性但是画板尚未变化时需要刷新

 // 编辑状态时的 LineItem
  this.lineItem = new EditLineItem(null, []);
 this.lineItem.status = SItemStatus.Create;
 this.view.update();

交互要求

• 点击item 选中态时出现选择控制点（增加是否可操作控制点状态）；
• 选中态时出现选择控制点；通过拖动选择控制点对图例进行放大缩小得操作（有最大最小的宽高）；
• 当拖动连接线的定点连接该item锚点时；接近item会显示锚点；
• 当文本大小固定；文本超出部分裁掉