Introduction to CAD Drawing: How does CAD software define viewports?

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When using legitimate CAD software to create drawings, the viewport function is often utilized. If you want to use a defined viewport, how should you proceed? Some beginners in CAD drawing are not aware of this. Next, let the editor use the legitimate CAD software – Haochen CAD Architecture Software – as an example to provide you with a detailed introductory tutorial on how CAD software defines viewports for those new to CAD drawing! Steps to define viewports in CAD software: First, open the HaoChen CAD architecture software ； Then locate the menu bar and click sequentially on Building Design → Document Layout → Define Viewport (DYSK). After selecting this menu command, if the current space is sheet space, it will switch to model space, and a dialog box will appear. Enter the appropriate parameters in this dialog box; typically, the area corresponding to a defined viewport is arranged horizontally, with a horizontal angle of 0. All that needs to be done is enter the viewport scale in the “Graphic Output Scale” field ； If it is necessary to define the angle of inclination in the horizontal direction, the most suitable method can be chosen from three options: entering the angle directly, selecting a wall or axis, or determining the angle by specifying two points. The interaction for determining the angle using the latter two methods is as follows. 1) Click the \"Select Object to Set Angle\" button; valid objects are axes or walls, and the interaction is as follows. Select the line or wall object that defines the horizontal direction of the corner viewport: select wall objects, including wall objects and lines ； The angle of the target object is used as the direction angle. When an object such as a circle, ellipse, arc, spline curve, polyline arc, or block for which no angle can be determined is selected, a dialog box is displayed allowing the angle to be specified using \"two points to determine angle\". 2) Click the “Define Angle with Two Points” button to determine the direction using two points; the interaction is as follows. Provide the first point that defines the horizontal direction of the angled viewport: Provide the first point P1 that defines the horizontal direction of the viewport ； Provide the second point that defines the horizontal direction of the angled viewport: Provide the second point P2 that defines the horizontal direction of the viewport ； 3) By default, \"Modify layout corners\" is selected. When this option is checked, the command causes the text and pattern fills of objects within the viewport to rotate by an angle corresponding to the direction of the viewport, aligning with that direction, as shown in the figure below. Note: If the hatch direction of wall and area objects in the viewport is incorrect in the layout, it may be due to the viewport content not having been refreshed in time. In such cases, the regenall command should be entered to force a refresh; at this point, the regen command will not work. The define viewport command begins to execute from the following command-line interaction. 4) If drawing first and then layout is adopted, specify the two diagonal corners of the definition viewport in model space. Command line prompt. Please provide the first point of the graphic viewport: select the first point of the viewport ； Second point: Click on the diagonal corner of the viewport, and the command line will display the scale of that viewport: Viewport output scale 1:: The current viewport scale; the default value is determined based on the selected objects. You can press Enter to use the default scale, or enter a new scale ； Please click on the location where you want to place the viewport: the graphic will automatically switch to paper space layout, and you can drag the viewport to the appropriate position to determine the insertion point for layout. 5) If the approach of planning first and then drawing is adopted, a blank area is defined in model space to select a viewport, which is then placed in paper space. This ratio must be consistent with the ratio of the graphic to be drawn. Multiple viewports with different scaling factors can be created at once; users can enter each viewport separately and click \"Maximize Viewport\" in the status bar to carry out drawing and editing tasks. The above is a detailed introduction provided by the editor on how to define viewports in the legitimate CAD software – HaoChen CAD Architecture Software. Those who are interested can refer to this introductory tutorial on CAD drawing to try it out~