在线CAD SDK 集成后怎么实现参数化绘图（在线编辑CAD）

MxDraw · 发表于 2023-11-6 14:04

本帖最后由 MxDraw 于 2023-11-6 14:24 编辑

前言

MxCAD 的WEB CAD SDK提供了参数化绘图的功能, 我们可以通过查看继承自McDbEntity的类的所有实例，它们都可以进行参数化的绘图。

首先我们应该在页面上显示一张图纸, 请根据mxcad入门文档的说明或者通过查看 github| gitee存储的初始化各种示例项目查看代码来实现显示图纸的页面。

在线CAD功能测试：https://demo.mxdraw3d.com:3000/mxcad/

点的绘制

参数化绘制一个CAD中的点:

import { MxCpp, McDbPoint, McCmColor } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const point = new McDbPoint()
const color = new McCmColor()
color.setRGB(0, 255, 255)
point.trueColor = color
point.setPosition(200, 200)
mxcad.drawEntity(point)

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效果图:

多行文字

绘制多行文字代码如下：

import { MxCpp, McGePoint3d, McCmColor, McDb, McDbMText } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const mText = new McDbMText()
const textId = mxcad.drawEntity(mText)
const text = textId.getMcDbEntity() as McDbMText
text.attachment = McDb.AttachmentPoint.kTopLeft
text.contents = "内容 \\P 内容"
text.location = new McGePoint3d(10, 20)
text.trueColor = new McCmColor(255, 0, 255)
text.textHeight = 10
mxcad.updateDisplay()

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效果图:

单行文字

绘制单行文本代码如下：

import { MxCpp, McGePoint3d, McCmColor, McDb, McDbText } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const text = new McDbText()
text.widthFactor = 1
text.horizontalMode = McDb.TextHorzMode.kTextCenter
text.verticalMode = McDb.TextVertMode.kTextBottom
text.textString = "内容"
text.position = new McGePoint3d(-10, -20)
text.trueColor = new McCmColor(255, 0, 255)
text.height = 10
mxcad.drawEntity(text)
mxcad.updateDisplay()

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效果图:

对齐标注

绘制对齐标注尺寸代码如下：

import { MxCpp, McGePoint3d, McCmColor, McDb, McDbAlignedDimension } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const mDimension = new McDbAlignedDimension()
const dimensionId = mxcad.drawEntity(mDimension)
const dimension = dimensionId.getMcDbEntity() as McDbAlignedDimension
dimension.xLine1Point = new McGePoint3d(0, 255)
dimension.xLine2Point = new McGePoint3d(30, 60)
dimension.dimLinePoint = new McGePoint3d(88, 88)
dimension.textAttachment = McDb.AttachmentPoint.kTopLeft
dimension.trueColor = new McCmColor(200, 255, 0)
dimension.oblique = 0
mxcad.updateDisplay()

效果图:

旋转标注

绘制旋转标注尺寸代码如下：

import { MxCpp, McGePoint3d, McCmColor, McDb, McDbRotatedDimension } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const mDimension = new McDbRotatedDimension()
const dimensionId = mxcad.drawEntity(mDimension)
const dimension = dimensionId.getMcDbEntity() as McDbRotatedDimension
dimension.xLine1Point = new McGePoint3d(100, -137)
dimension.xLine2Point = new McGePoint3d(161,30)
dimension.dimLinePoint = new McGePoint3d(80, -60)
dimension.textAttachment = McDb.AttachmentPoint.kTopLeft
dimension.textRotation = 0.23
dimension.trueColor = new McCmColor(200, 255, 0)
dimension.oblique = 0
dimension.rotation = 0
mxcad.updateDisplay()

效果图:

绘制直线

绘制直线代码如下：

import { MxCpp, McCmColor, McDbLine } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const line = new McDbLine(0, 0, 0, -80, -80, 0)
line.trueColor = new McCmColor(255, 0, 0)
mxcad.drawEntity(line)

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效果图:

绘制圆

绘制圆代码如下：

import { MxCpp, McCmColor, McDbCircle } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const circle = new McDbCircle(-100, 300, 0, 20)
circle.trueColor = new McCmColor(255, 0, 0)
mxcad.drawEntity(circle)

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效果图:

绘制多义线

绘制多义线代码如下：

import { MxCpp, McGePoint3d, McDbPolyline } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const polyline = new McDbPolyline()
polyline.isClosed = false
polyline.constantWidth = 10
polyline.addVertexAt(new McGePoint3d(100, 100))
polyline.addVertexAt(new McGePoint3d(200, 100), 0.2, 1, 5, 1)
polyline.addVertexAt(new McGePoint3d(100, 200), 0.2, 5, 1, 2)
mxcad.drawEntity(polyline)

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效果图:

绘制圆弧

绘制圆弧代码如下:

import { MxCpp, McGePoint3d, McDbArc, McCmColor } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const arc = new McDbArc()
arc.center = new McGePoint3d(-100, -100),
arc.radius = 20
arc.startAngle = Math.PI / 2
arc.endAngle = Math.PI * 3 / 2
arc.trueColor = new McCmColor(255, 233, 0)
mxcad.drawEntity(arc)

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效果图:

绘制椭圆

绘制椭圆代码如下:

import { MxCpp, McGePoint3d, McDbEllipse, McCmColor, McGeVector3d } from "mxcad"
const mxcad = MxCpp.App.getCurrentMxCAD()
const ellipse = new McDbEllipse()
ellipse.center = new McGePoint3d(-200, -200),
ellipse.majorAxis = new McGeVector3d(0, 300, 0)
ellipse.minorAxis = new McGeVector3d(33, 0, 0)
ellipse.radiusRatio = 0.5
ellipse.startAngle = Math.PI / 2
ellipse.endAngle = Math.PI * 3 / 2
ellipse.trueColor = new McCmColor(255, 233, 0)
mxcad.drawEntity(ellipse)

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效果图:

交互绘制

如果上述位置属性是用户通过点击或者输入框输入，mxcad就提供了这样一套用于获取用户输入并在绘制中得到输入的机制，最频繁的应该是鼠标点击输入。

1、通过鼠标点击获取CAD图纸中的坐标位置，代码如下：

import { MxCADUiPrPoint } from "mxcad"
const getPoint = new MxCADUiPrPoint()
const point = await getPoint.go()
console.log(point)

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上述代码打印的就是一个坐标点了, 其坐标点是用户通过鼠标点击获取到的对应的图纸坐标位置。

2、通过输入框输入值, 来确定除了坐标以外的其他参数，代码如下：

const input = document.createElement("input")
input.addEventListener("keydown", (e: KeyboardEvent) => {
// 设置传输命令行消息数据
MxFun.setCommandLineInputData((e.target as HTMLInputElement).value, e.keyCode);
})
document.body.appendChild(input)

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mxcad中引用了mxdraw 下载依赖时会自动下载, 所有我们只要安装了mxcad就可以使用mxdraw。

如上代码所示, 我们传入用户输入的内容和对应按键的keyCode值

const getInt = new MxCADUiPrInt()
const getKey = new MxCADUiPrKeyWord
const getStr = new MxCADUiPrString()
getInt.setMessage("提示用户输入数字:")
const intVal = await getInt.go()
console.log(intVal)
getKey.setMessage("提示用户关键词 A、 B、 C:")
getKey.setKeyWords("A B C")
const keyVal = await getKey.go()
console.log(keyVal)
getStr.setMessage("提示用户输入字符串:")
const strVal = await getStr.go()
console.log(strVal)
上述代码会在用户输入对应类型的数据后按下回车键(Enter或者Esc)才会往下执行, 通过setMessage设置提示，最终得到用户输入的数据, 通过这些数据进行参数化绘图。
最后这些设置的用户提示通过下面代码获得:
import { MxFun } from "mxdraw"
MxFun.listenForCommandLineInput(({ msCmdTip, msCmdDisplay, msCmdText }) => {
console.log(msCmdTip, msCmdDisplay, msCmdText)
}
);

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如果你无法理解上述某个函数的意思，可以在mxdraw API文档或者mxcad API文档中查看对应的APi说明。

参数化绘制文字的完整流程

下面简单实现一个的参数化绘制文字的流程:

import { MxFun } from "mxdraw"
import { MxCADUiPrInt, MxCADUiPrKeyWord, MxCADUiPrString, MxCADUiPrPoint, McDbText, MxCpp } from "mxcad"
MxFun.addCommand("Mx_draw_Text", async ()=> {
const getInt = new MxCADUiPrInt()
const getKey = new MxCADUiPrKeyWord()
const getStr = new MxCADUiPrString()
const getPoint = new MxCADUiPrPoint()
const text = new McDbText()
getPoint.setMessage("请点击确定文字位置")
const position = await getPoint.go()
if(!position) return
text.position = position
getInt.setMessage("请输入文字高度")
const height = await getInt.go()
if(!height) return
text.height = height
getKey.setMessage("选择水平对齐方式快捷键 L: 左对齐 C: 居中对齐 R: 右对齐 A: 水平对齐 M: 垂直中间对齐 F: 自适应")
getKey.setKeyWords("L C R A M F")
await getKey.go()
if(getKey.isKeyWordPicked("L")) text.horizontalMode = McDb.TextHorzMode.kTextLeft
if(getKey.isKeyWordPicked("C")) text.horizontalMode = McDb.TextHorzMode.kTextCenter
if(getKey.isKeyWordPicked("R")) text.horizontalMode = McDb.TextHorzMode.kTextRight
if(getKey.isKeyWordPicked("A")) text.horizontalMode = McDb.TextHorzMode.kTextAlign
if(getKey.isKeyWordPicked("M")) text.horizontalMode = McDb.TextHorzMode.kTextMid
if(getKey.isKeyWordPicked("F")) text.horizontalMode = McDb.TextHorzMode.kTextFit
getStr.setMessage("请输入文字内容")
const str = await getStr.go()
if(!str) return
text.textString = str
const mxcad = MxCpp.App.getCurrentMxCAD()
mxcad.drawEntity(text)
})

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演示Demo源码:

https://gitee.com/mxcadx/mxdraw-article/tree/master/mxcad参数化绘图/demo.zip

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在线CAD SDK 集成后怎么实现参数化绘图（在线编辑CAD）

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