新手入门必看：VectorDraw 常见问题整理大全（十五）

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VectorDraw Developer Framework（VDF）是一个用于应用程序可视化的图形引擎库。有了VDF提供的功能，您可以轻松地创建、编辑、管理、输出、输入和打印2D和3D图形文件。该库还支持许多矢量和栅格输入和输出格式，包括本地PDF和SVG导出。

【VectorDraw Developer Framework最新版下载】

VectorDraw web library (javascript)是一个矢量图形库。VectorDraw web library (javascript)不仅能打开CAD图纸，而且能显示任何支持HTML5标准平台上的通用矢量对象，如Windows，安卓，iOS和Linux。无需任何安装，VectorDraw web library (javascript)就可以运行在任何支持canvas标签和Javascript的主流浏览器（Chrome, Firefox, Safari, Opera, Dolphin, Boat等等）中。

【VectorDraw web library (javascript)最新版下载】

一. 更改鼠标光标或将其隐藏

问：如何更改鼠标光标或隐藏它？

答：你可以使用SetCustomMousePointer方法将光标更改为Cursor（在下面的代码中更改为Cursors.PanNW）。要隐藏光标，你需要使用属性ShowCursor和vdMouseEnter事件。请看以下代码：

private void Form1_Load(object sender, EventArgs e)
{
    vdFramedControl1.BaseControl.vdMouseEnter += new VectorDraw.Professional.Control.MouseEnterEventHandler(BaseControl_vdMouseEnter);
}

private bool show_pointer = true; // a flag in the form that controls if the cursor will be visible or not.

void BaseControl_vdMouseEnter(EventArgs e, ref bool cancel)
{
    if (show_pointer) return; // show the cursor
        //else hide the cursor with the code below
    cancel = true; 
    vdFramedControl1.BaseControl.ActiveDocument.GlobalRenderProperties.ShowCursor = false; //Hide cursor
    vdFramedControl1.BaseControl.ActiveDocument.ActiveLayOut.MouseEnter(this, e); // this is needed
}

private void button7_Click(object sender, EventArgs e) // Button to set the cursor to another cursor
{
    vdFramedControl1.BaseControl.SetCustomMousePointer(Cursors.PanNW); // set the cursor to another cursor
    //using GetCustomeMousePointer you can get the cursor.
}

private void button8_Click(object sender, EventArgs e) //Button to set the cursor to default VDF cross
{
    vdFramedControl1.BaseControl.SetCustomMousePointer(null); // set the cursor to VDF cross
}

private void button9_Click(object sender, EventArgs e)//Button to Hide the cursor
{
show_pointer = false;
vdFramedControl1.BaseControl.ActiveDocument.GlobalRenderProperties.ShowCursor=false; //Hide cursor
}

private void button10_Click(object sender, EventArgs e) //Button to show the cursor
{
    show_pointer = true;
    vdFramedControl1.BaseControl.ActiveDocument.GlobalRenderProperties.ShowCursor=true; //Show cursor
}

 
 
Another way to hide the cursor, is to change it to an "empty"/"transparent" cursor that you will add to your project resources. In this case you will not need the vdMouseEnter event and the global flag and your code should be :
private void button9_Click(object sender, EventArgs e)
{
    vdFramedControl1.BaseControl.SetCustomMousePointer(new Cursor(WindowsApplication1.Properties.Resources.Icon1.Handle)); // set the cursor to an "empty/transparent" cursor Icon1.
}

private void button10_Click(object sender, EventArgs e)
{
    vdFramedControl1.BaseControl.SetCustomMousePointer(null); // set it to the default (visible)
}

二. 在所有图纸上绘制图纸的示例

问：我想实现一些功能，在屏幕上的所有实体的顶部呈现覆盖。在开始时，我只想在当前的vdraw视图的左下角绘制一个日期字符串。该文本将是视图独立的，因此无论用户选择何种3D视图，都将面向用户绘制。我也希望文本周围有点阴影，以便很容易看到。你认为最佳方法是什么？能否给出代码示例呢，谢谢！

答：可使用vdFramed控件的C＃Windows应用程序中的示例：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using VectorDraw.Professional.vdObjects;
using VectorDraw.Professional.vdFigures;
using VectorDraw.Professional.vdPrimaries;
using VectorDraw.Generics;
using VectorDraw.Geometry;
using VectorDraw.Professional.vdCollections;
using VectorDraw.Actions;


namespace WindowsApplication2
{


   public partial class Form2 : Form
   {

      public Form2()
      {
         InitializeComponent();
      }


      private vdDocument doc { get { return vdFramedControl1.BaseControl.ActiveDocument; } }


      VectorDraw.Render.grTextStyle textstyle = null;


      protected override void OnLoad(EventArgs e)
      {
         base.OnLoad(e);
         doc.OnDrawAfter += new vdDocument.DrawAfterEventHandler(doc_OnDrawAfter);
         doc.OnDrawOverAll += new vdDocument.DrawOverAllEventHandler(doc_OnDrawOverAll);
         //create a global TextStyle used to draw the overall text
         textstyle = new VectorDraw.Render.grTextStyle("Arial");
      }

    void drawoverall(VectorDraw.Render.vdRender render)
    {
        double DPIScale=1.0d; //ratio render DPI/ScreenDPI
        if (render.Display == VectorDraw.Render.vdRender.DisplayMode.PRINT_PREVIEW_PAPER || render.Display == VectorDraw.Render.vdRender.DisplayMode.PRINT_PREVIEW)
        {
            DPIScale = (double)render.Height / (double)(doc.ActiveLayOut.Printer.LandScape ? doc.ActiveLayOut.Printer.paperSize.Width : doc.ActiveLayOut.Printer.paperSize.Height);
        }

        //make the active render unlock so it will always draw using GDIPlus API
        bool islock = render.IsLock;
        if (islock) render.UnLock();
        //Get the display string
        string str = System.DateTime.Now.ToShortDateString();
        //Calculate the text box with the selecting text style Size.
        Box textbox = textstyle.GetBaseTextBox(str, null);
        //create a box that will be drawn in the text background and will be 25% biger tham the text box.
        Box box = new Box(textbox);
        box.AddWidth(textbox.Height * 0.25);
        //calculate a Matrix that will scale and offset the drawing primitives.
        Matrix m = new Matrix();
        double OneMM_DUSize = render.PixelSize * DPIScale * render.DpiY * 1.0d / 25.4;
        //select the text height to be 10 mm of height.
        double scale = OneMM_DUSize * 10.0d / textbox.Height;
        Box rendersize = render.ClipBounds.ToBox();

        //select the left offset of the box to be 15 mm of width, and the the bottom offset of the box to be 15 mm.
        gPoint offset = new gPoint((render.ClipBounds.Xmin + OneMM_DUSize * 15.0d), (render.ClipBounds.Ymin + box.Height * scale + OneMM_DUSize * 15.0d));
        if (render.IsPrinting) //taking into consideration the printer hardware margins
        {
            offset.x += (OneMM_DUSize * Globals.INCH_MM * doc.ActiveLayOut.Printer.Hardmargins.Left / 100);
            offset.y += (OneMM_DUSize * Globals.INCH_MM * doc.ActiveLayOut.Printer.Hardmargins.Bottom / 100);
        }

        m.ScaleMatrix(scale, scale, scale);
        m.TranslateMatrix(offset);

        //select the matrix and draw the primitives
        render.PushToViewMatrix();
        render.PushMatrix(m);
        render.PushPenstyle(new VectorDraw.Render.vdGdiPenStyle(Color.Brown, 150));
        render.DrawSolidBoundBox(this, box);
        render.PopPenstyle();
        render.PushPenstyle(new VectorDraw.Render.vdGdiPenStyle(Color.Blue, 255));
        render.DrawString(this, textstyle, null, str, textbox);
        render.PopPenstyle();
        render.PopMatrix();
        render.PopMatrix();
        if (islock) render.Lock();
    }


//we use the OnDrawAfter event only when priniting because the OnDrawOverAll is not fired when printing
      void doc_OnDrawAfter(object sender, VectorDraw.Render.vdRender render)
      {
         if (render.IsPrinting && (render.Display == VectorDraw.Render.vdRender.DisplayMode.PRINT_PREVIEW_PAPER || render.Display == VectorDraw.Render.vdRender.DisplayMode.PRINT_PRINTER_PAPER)) drawoverall(render);
      }


      void doc_OnDrawOverAll(object sender, VectorDraw.Render.vdRender render, ref bool cancel)
      {
         drawoverall(render);
      }


   }
}

三. 在HIDE模式下具有更细的线条

问：是否可以在HIDE模式下使用更细的线条？

答：当RenderMode为Hidden或ShadeOn时，可以使用FixedShadeOnPenWidth全局属性来控制线宽，如：

    VectorDraw.Render.vdRenderGlobalProperties.FixedShadeOnPenWidth = 0.0f;

默认值为0.016。此值表示以英寸为单位的线宽，通过将其设置为0，然后在HIDE模式下将1个像素用于“线”。

四. 根据GridMode = True的缩放动态更新限制

问：我打开了网格，并将vdDocument.Limits框设置为视图的当前可见范围。当用户使用鼠标滚轮缩小时，我目前没有将Limits值更改为当前视图范围，但希望这样做。如何捕捉鼠标滚轮的事件，以便我可以将网格的限制更改为新的范围？如何获得缩放更改事件，这是保持网格覆盖整个屏幕的最佳方法吗？

答：执行此操作的最佳方法是覆盖vddocument的draw和drawoverall事件，代码如下所示：

private void Form1_Load(object sender, EventArgs e)
{
   vdFramedControl.BaseControl.ActiveDocument.OnDraw += new vdDocument.DrawEventHandler(doc_OnDraw);
   vdFramedControl.BaseControl.ActiveDocument.OnDrawOverAll += new vdDocument.DrawOverAllEventHandler(doc_OnDrawOverAll);
}

void doc_OnDrawOverAll(object sender, VectorDraw.Render.vdRender render, ref bool cancel)
{
   vdDocument document = sender as vdDocument;
   UpdateLimits(document.ActiveLayOut);
}
void doc_OnDraw(object sender, VectorDraw.Render.vdRender render, ref bool cancel)
{
   vdDocument document = sender as vdDocument;
   UpdateLimits(document.ActiveLayOut);
}

private void UpdateLimits(vdLayout layout)
{
   if (layout != null && layout.World2ViewMatrix.Zdir.Equals(layout.World2UserMatrix.Zdir))
   {
      Box limitBox = layout.Render.ClipBounds.ToBox(); 
      limitBox.AddWidth(limitBox.Width / 2.0); 
      limitBox.TransformBy((layout.View2WorldMatrix * layout.World2UserMatrix));
      layout.Limits.Empty(); layout.Limits.AddBox(limitBox);
   }
}

未完待续~

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