在线CAD二次开发实现箭头引注和多重引线标注的方法
本帖最后由 MxDraw 于 2024-10-23 10:46 编辑箭头引注 本章介绍如何利用 mxcad 插件实现在CAD图纸中箭头引注的功能，该功能中用户点击画布确定箭头起点，再次连续点击画布确定箭头引线顶点及终点位置。用户可自定义选择箭头形状，上标文字和下标文字内容，还可以根据绘制需求修改文字位置等，帮助用户快速标注图纸内容，增加图纸内容的完整性和可读性。
功能实现
1.实现自定义箭头引注类为了方便后期管理与修改标注，我们可以通过继承自定义实体类来扩展实现自定义箭头引注类。然后我们可以利用或构造测量信息多文本对象，将标注信息绘制在页面中。
下面示例的箭头引注类中我们提供了箭头、点、十字、半箭头等箭头样式，以及上下标文字在线端、齐线中、齐线端等对齐方式，用户可参考下面的示例代码根据自身项目需求进行二次开发，为方便管理我们将箭头样式和文字对齐方式设置为枚举对象，代码如下： // 箭头样式
enum arrowType {
// 箭头
arrow,
// 半箭头
halfArrow,
// 点
point,
// 十字
cross,
// 无
none
}
// 文字对齐方式
export enum alginType {
// 始端
start,
// 中间
middle,
// 末端
end
}
箭头引注自定义实体代码如下，下面示例只作参考，用户可根据自身需求修改, 代码如下： class McDbTestArrowCitation extends McDbCustomEntity {
// 定义McDbTestConMeasurement内部的点对象
// 箭头线点数组
private points: McGePoint3d[] = [];
// 文字点位置集合
private positionArr: McGePoint3d[] = [];
// 文字高度
private height: number = 0;
// 上标文字内容
private _textUp: string = "";
// 下标文字内容
private _textDown: string = "";
// 箭头样式
private _arrowType: number = arrowType.arrow;
// 对齐方式
private _alginType: number = alginType.start;
// 记录初始长度
private arrowLength: number = MxFun.viewCoordLong2Cad(20);;
// 文字旋转角度
private angle: number = 0;
// 构造函数
constructor(imp?: any) {
super(imp);
}
// 创建函数
public create(imp: any) {
return new McDbTestArrowCitation(imp)
}
// 获取类名
public getTypeName(): string {
return "McDbTestArrowCitation";
}
//设置或获取文本字高
public set textHeight(val: number) {
this.height = val;
}
public get textHeight(): number {
return this.height;
}
//设置或获取上标文本
public set textUp(val: string) {
this._textUp = val;
}
public get textUp(): string {
return this._textUp;
}
//设置或获取下标文本
public set textDown(val: string) {
this._textDown = val;
}
public get textDown(): string {
return this._textDown;
}
//设置或获取箭头样式
public set arrowType(val: number) {
this._arrowType = val;
}
public get arrowType(): number {
return this._arrowType;
}
//设置或获取对齐样式
public set alginType(val: number) {
this._alginType = val;
}
public get alginType(): number {
return this._alginType;
}
// 读取自定义实体数据
public dwgInFields(filter: IMcDbDwgFiler): boolean {
this.points = filter.readPoints("points").val;
this.positionArr = filter.readPoints("positionArr").val;
this._textDown = filter.readString("textDown").val;
this._textUp = filter.readString("textUp").val;
this._arrowType = filter.readLong("arrowType").val;
this._alginType = filter.readLong("alginType").val;
this.arrowLength = filter.readLong("arrowLength").val;
this.angle = filter.readDouble("angle").val;
this.height = filter.readDouble("height").val;
return true;
}
// 写入自定义实体数据
public dwgOutFields(filter: IMcDbDwgFiler): boolean {
filter.writePoints("points", this.points);
filter.writePoints("positionArr", this.positionArr);
filter.writeString("textDown", this._textDown);
filter.writeString("textUp", this._textUp);
filter.writeLong("arrowType", this._arrowType);
filter.writeLong("alginType", this._alginType);
filter.writeLong("arrowLength", this.arrowLength);
filter.writeDouble("angle", this.angle);
filter.writeDouble("height", this.height);
return true;
}
// 移动自定义对象的夹点
public moveGripPointsAt(iIndex: number, dXOffset: number, dYOffset: number, dZOffset: number) {
this.assertWrite();
const length = this.points.length
if (iIndex <= length - 1) {
this.points.x += dXOffset;
this.points.y += dYOffset;
this.points.z += dZOffset;
}
if (iIndex === length - 1) {
this.positionArr.forEach(position => {
position.x += dXOffset;
position.y += dYOffset;
position.z += dZOffset;
});
this.reCountData();
};
if (iIndex > length - 1) {
this.positionArr.forEach((position, index) => {
if (iIndex - length === index) {
position.x += dXOffset;
position.y += dYOffset;
position.z += dZOffset;
}
});
}
};
// 获取自定义对象的夹点
public getGripPoints(): McGePoint3dArray {
let ret = new McGePoint3dArray()
this.points.forEach(pt => {
ret.append(pt)
});
this.positionArr.forEach(pt => {
ret.append(pt);
})
return ret;
};
// 画箭头
private drawArrow(): McDbEntity[] {
const pt1 = this.points;
const pt2 = this.points;
if (this._arrowType === arrowType.arrow || this._arrowType === arrowType.halfArrow) {
const vec = pt2.sub(pt1).normalize().mult(this.arrowLength);
const pt = pt1.clone().addvec(vec);
const _vec = vec.clone().rotateBy(Math.PI / 2).normalize().mult(this.arrowLength / 8);
const pt3 = pt.clone().addvec(_vec);
const pt4 = pt.clone().subvec(_vec);
const solid = new McDbHatch();
this._arrowType === arrowType.arrow ? solid.appendLoop(new McGePoint3dArray()) : solid.appendLoop(new McGePoint3dArray());
return
}else if(this._arrowType === arrowType.point){
const solid = new McDbHatch();
solid.appendCircleLoop(pt1.x,pt1.y,this.arrowLength/3);
return
}else if(this._arrowType === arrowType.cross){
const point1 = pt1.clone().addvec(McGeVector3d.kXAxis.normalize().mult(this.arrowLength/2));
const point2 = pt1.clone().subvec(McGeVector3d.kXAxis.normalize().mult(this.arrowLength/2));
const point3 = pt1.clone().addvec(McGeVector3d.kYAxis.normalize().mult(this.arrowLength/2));
const point4 = pt1.clone().subvec(McGeVector3d.kYAxis.normalize().mult(this.arrowLength/2));
const line1 = new McDbLine(point1,point2);
const line2 = new McDbLine(point3, point4);
return
}
}
// 画文字
private drawText(): McDbEntity[] {
const textArr = [];
const textUp = new McDbText();
textUp.height = this.height;
textUp.textString = this._textUp;
textUp.position = textUp.alignmentPoint = this.positionArr;
textUp.horizontalMode = McDb.TextHorzMode.kTextLeft;
textUp.rotate(this.positionArr, this.angle);
if (this._alginType === alginType.middle || this._alginType === alginType.end) {
const textDown = new McDbMText()
textDown.contents = this._textDown;
textDown.location = this.positionArr;
textDown.textHeight = this.height;
textDown.attachment = McDb.AttachmentPoint.kTopCenter;
textDown.rotate(this.positionArr, this.angle);
if (this._alginType === alginType.middle) {
textUp.horizontalMode = McDb.TextHorzMode.kTextMid;
}
if (this._alginType === alginType.end) {
textDown.attachment = McDb.AttachmentPoint.kTopLeft;
}
textArr.push(textDown);
}
textArr.push(textUp);
return textArr
}
// 绘制实体
public worldDraw(draw: MxCADWorldDraw): void {
// 画多段线
const pl = new McDbPolyline();
this.points.forEach((pt) => {
pl.addVertexAt(pt);
});
draw.drawEntity(pl);
// 画箭头
if(this._arrowType !== arrowType.none && this.points.length > 1){
const arrowArr = this.drawArrow();
arrowArr.forEach( arrow =>{
draw.drawEntity(arrow)
})
}
if (this.points.length > 1) {
// 画标注
const textArr = this.drawText();
textArr.forEach(text => {
draw.drawEntity(text)
})
}
}
private reCountData() {
const length = this.points.length;
// 获取最后一段直线的方向与旋转角度
if (length > 1) {
const pt1 = this.points;
const pt2 = this.points;
if (!this.height) {
this.height = this.arrowLength*(2/3);
};
const vec = pt2.sub(pt1).normalize().mult(this.height / 2);
const _vec = vec.clone().rotateBy(Math.PI / 2).normalize().mult(this.height / 2);
this.angle = vec.angleTo2(McGeVector3d.kXAxis, McGeVector3d.kNegateZAxis);
if (Math.PI * (3 / 2) > this.angle && this.angle > Math.PI / 2) {
this.angle += Math.PI;
_vec.negate();
}
if (this._alginType === alginType.start) {
// 在线端，只有上标文字
const position = pt2.clone().addvec(vec).subvec(_vec);
this.positionArr = position;
} else if (this._alginType === alginType.middle) {
// 齐线中，上下标文字居中
const distance = pt1.distanceTo(pt2);
const midPt = pt1.clone().addvec(vec.normalize().mult(distance / 2))
this.positionArr = midPt.clone().subvec(_vec);
this.positionArr = midPt.clone().addvec(_vec);
} else if (this._alginType === alginType.end) {
// 齐线端，上下标文字在末尾
this.positionArr = pt2.clone().addvec(vec).subvec(_vec);
this.positionArr = pt2.clone().addvec(vec).addvec(_vec);
}
}
}
// 添加顶点
public addVertex(pt: McGePoint3d) {
this.assertWrite();
this.points.push(pt);
this.reCountData();
}
// 获取顶点数组
public getPoints() {
return this.points;
}
};
2. 注册自定义类信息运行代码： new McDbTestArrowCitation().rxInit();
3.调用McDbTestArrowCitation自定义箭头引注类3.1设置箭头样式，上下标文字内容及对齐方式我们可以利用根据根据用户输入得到上下标文字内容，或者通过其他方式直接赋值。选择箭头样式或对齐方式时，我们可以通过根据用户选择的关键词来设置相应操作。 // 设置箭头样式
const getArrowStyle = new MxCADUiPrKeyWord()
getArrowStyle.setMessage("请选着箭头样式：")
getArrowStyle.setKeyWords("[箭头(A)/半箭头(HA)/点(P)/十字(C)/无(N)]")
let arrowStyle = await getArrowStyle.go();
// 转换arrowStyle的值
switch (arrowStyle) {
case 'A':
arrowStyle = arrowType.arrow;
case 'HA':
arrowStyle = arrowType.halfArrow;
case 'P':
arrowStyle = arrowType.point;
case 'C':
arrowStyle = arrowType.cross;
case 'N':
arrowStyle = arrowType.none;
default:
arrowStyle = arrowType.arrow;
}
// 设置对齐方式
const getAlignType = new MxCADUiPrKeyWord()
getAlignType.setMessage("请选择上下标文字对齐方式：")
getAlignType.setKeyWords("[在线端(S)/齐线中(M)/齐线端(E)]")
let alignType = await getAlignType.go();
// 转换alignType的值
switch (alignType) {
case 'S':
alginType = alginType.start;
case 'M':
alginType = alginType.middle;
case 'E':
alginType = alginType.end;
default:
alginType = alginType.start;
}
/**
设置上下标文字
在线端只能设置上标文字
*/
const getStrUp = new MxCADUiPrString();
getStrUp.setMessage('请设置上标文字内容：');
let strUp = await getStrUp.go();
if (!strUp) strUp = "上";
let strDown = "";
if(alignType === "M" || alignType === "R"){
const getStrDown = new MxCADUiPrString();
getStrDown.setMessage('请设置下标文字内容：');
strDown = await getStrDown.go();
if (!strDown) strDown = "下";
}
3.2. 获取箭头起点，及引线顶点我们可以利用取点对象连续取点来获取箭头起点和引线的各个顶点。结合上述步骤中获取的箭头引注的信息，构造新的箭头引注对象，并动态绘制方便用户观察。 const arrowCiatat = new McDbTestArrowCitation();
arrowCiatat.textUp = strUp;
arrowCiatat.textDown = strDown;
arrowCiatat.arrowType = arrowStyle;
arrowCiatat.alginType = alginType;
const getPoint = new MxCADUiPrPoint();
getPoint.setMessage('指定箭头起点:');
const point = await getPoint.go();
if (!point) return;
arrowCiatat.addVertex(point);
while (true) {
const getPt = new MxCADUiPrPoint();
getPt.setMessage('指定下一点或终点，右键完成');
getPt.setUserDraw((pt, pw) => {
const _clone = arrowCiatat.clone() as McDbTestArrowCitation;
_clone.addVertex(pt);
pw.drawMcDbEntity(_clone)
})
const pt = await getPt.go();
if (!pt) break;
arrowCiatat.addVertex(pt);
}
const mxcad = MxCpp.getCurrentMxCAD();
mxcad.drawEntity(arrowCiatat);
功能实践在线示例demo:https://demo.mxdraw3d.com:3000/mxcad/，操作流程如下图：
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