加折断线
下面我们将介绍如何利用 mxcad 插件实现在CAD图纸中加折断线的功能,该功能中用户可设置折断数,点击画布可确定折断线起始位置。
功能实现
- 实现自定义折断线类
为了方便后期管理与修改折断线设置,我们可以通过继承 McDbCustomEntity 自定义实体类来扩展实现自定义折断线类。
ts
// 折断线类
class McDbTestFractureLine extends McDbCustomEntity {
// 定义McDbTestFractureLine内部的点对象
// 折断线开始点
private startPoint: McGePoint3d = new McGePoint3d();
// 折断线结束点
private endPoint: McGePoint3d = new McGePoint3d();
// 折断宽度
private _breakWidth: number = 0;
// 折断数目
private _breakCount: number = 1;
// 构造函数
constructor(imp?: any) {
super(imp);
}
// 创建函数
public create(imp: any) {
return new McDbTestFractureLine(imp)
}
// 获取类名
public getTypeName(): string {
return "McDbTestFractureLine";
}
//设置或获取折断线宽度
public set breakWidth(val: number) {
this._breakWidth = val;
}
public get breakWidth(): number {
return this._breakWidth;
}
//设置或获取折断数量
public set breakCount(val: number) {
this._breakCount = val;
}
public get breakCount(): number {
return this._breakCount;
}
// 读取自定义实体数据
public dwgInFields(filter: IMcDbDwgFiler): boolean {
this.startPoint = filter.readPoint("startPoint").val;
this.endPoint = filter.readPoint("endPoint").val;
this._breakWidth = filter.readDouble("breakWidth").val;
this._breakCount = filter.readLong("breakCount").val;
return true;
}
// 写入自定义实体数据
public dwgOutFields(filter: IMcDbDwgFiler): boolean {
filter.writePoint("startPoint", this.startPoint);
filter.writePoint("endPoint", this.endPoint);
filter.writeDouble("breakWidth", this._breakWidth);
filter.writeLong("breakCount", this._breakCount);
return true;
}
// 移动自定义对象的夹点
public moveGripPointsAt(iIndex: number, dXOffset: number, dYOffset: number, dZOffset: number) {
this.assertWrite();
if (iIndex === 0) {
this.startPoint.x += dXOffset;
this.startPoint.y += dYOffset;
this.startPoint.z += dZOffset;
} else if (iIndex === 1) {
this.endPoint.x += dXOffset;
this.endPoint.y += dYOffset;
this.endPoint.z += dZOffset;
}
};
// 获取自定义对象的夹点
public getGripPoints(): McGePoint3dArray {
let ret = new McGePoint3dArray()
ret.append(this.startPoint);
ret.append(this.endPoint);
return ret;
};
// 绘制实体
public worldDraw(draw: MxCADWorldDraw): void {
if (!this._breakWidth) this.breakWidth = MxFun.screenCoordLong2Doc(30);
const pointArr = this.getBreakPoint();
const pl = new McDbPolyline();
pl.addVertexAt(this.startPoint);
if (pointArr.length > 0) {
pointArr.forEach(pt => {
pl.addVertexAt(pt)
})
}
pl.addVertexAt(this.endPoint);
draw.drawEntity(pl);
}
// 设置折断线开始点
public setStartPoint(pt: McGePoint3d) {
this.startPoint = pt.clone()
}
// 获取折断线开始点
public getStartPoint() {
return this.startPoint;
}
// 设置折断线结束点
public setEndPoint(pt: McGePoint3d) {
this.endPoint = pt.clone()
}
// 获取折断线结束点
public getEndPoint() {
return this.endPoint;
}
private getBreakPoint(): McGePoint3d[] {
let pointArr: McGePoint3d[] = [];
const vec = this.endPoint.sub(this.startPoint).normalize();
const length = this.endPoint.distanceTo(this.startPoint);
/**
* 动态计算折断数, 向下取整
* n个折断就是将直线分为n段
*/
const num = Math.floor(length / this._breakWidth);
let count = this._breakCount;
if (num < 1) return [];
if (num < this._breakCount) count = num;
const dist = length / count;
for (let i = 1; i <= count; i++) {
const midPt = this.startPoint.clone().addvec(vec.clone().mult(length / count * i - dist / 2));
const pt1 = midPt.clone().subvec(vec.clone().mult(this._breakWidth / 2));
const pt2 = pt1.clone().addvec(vec.clone().mult(this._breakWidth / 4)).addvec(vec.clone().perpVector().mult(this._breakWidth * (2 / 3)));
const pt4 = midPt.clone().addvec(vec.clone().mult(this._breakWidth / 2));
const pt3 = pt4.clone().subvec(vec.clone().mult(this._breakWidth / 4)).subvec(vec.clone().perpVector().mult(this._breakWidth * (2 / 3)));
pointArr.push(pt1, pt2, pt3, pt4)
}
return pointArr
}
};
- 注册自定义类信息
ts
new McDbTestFractureLine().rxInit();
- 编写方法,调用 McDbTestFractureLine 自定义折断线类实现引出标注功能
- 设置折断数
我们可以利用 MxCADUiPrInt() 获取用户输入整数值。
ts
// 设置折断数
const getBreakCount = new MxCADUiPrInt();
getBreakCount.setMessage('请设置折断数:');
let breakCount = await getBreakCount.go();
// 默认设置折断数为1
if (!breakCount || breakCount < 1) breakCount = 1;
fl.breakCount = breakCount;
- 设置折断线位置
调用 MxCADUiPrPoint 取点对象设置折断线的起始点位置。
ts
// 新建折断线对象
const fl = new McDbTestFractureLine();
const getPoint1 = new MxCADUiPrPoint();
getPoint1.setMessage('请设置折断线起点:');
const pt1 = await getPoint1.go();
if (!pt1) return;
fl.setStartPoint(pt1);
const getPoint2 = new MxCADUiPrPoint();
getPoint2.setMessage('请设置折断线结束点:');
getPoint2.setUserDraw((pt, pw) => {
const _fl = fl.clone() as McDbTestFractureLine;
_fl.setEndPoint(pt);
pw.drawMcDbEntity(_fl)
});
const pt2 = await getPoint2.go();
if (!pt2) return;
fl.setEndPoint(pt2);
MxCpp.getCurrentMxCAD().drawEntity(fl);
功能实践
实践效果如下:
- 点击加折断线按钮,执行加折断线方法
- 根据命令行提示设置折断数
- 点击鼠标左键设置折断线起始点
- 成功绘制折断线