Preset and practice based on the data type standard library query of the new control

Reading standard part parameters to achieve AutoCAD drawing Here we can read the data of the text control to achieve the drawing of standard parts. Creating AutoCAD Entities Here are lines and arcs: Creating a straight line is the most basic object in AutoCAD. Users can create various straight lines, single straight lines, multiple straight line segments with arcs, or multiple straight line segments without arcs. Usually, you can draw a line by specifying a coordinate point. The default line type is CONTINUOUS (that is, continuous lines), but there are many line types that use points and dotted lines.

Create dimension labels to display the object's shape measurements, the distance or angle between objects, and the X and Y coordinates of the feature. AutoCAD provides three basic annotations: linearity, radius, and angle. Linear labels include alignment labels, corner labels, and coordinate labels.

We can create linear, radius, angle, and coordinate labels. Here, for example, the radius is used to measure the radius and diameter of the arc and the circle. To create a radius callout, use the AddDimRadial or AddDimDiametric methods. These methods require three values ​​to be entered: the center coordinates of the circle or arc, the coordinates to which the wire is attached, and the length of the wire.

When creating text using a single line of text, each single line of text is a different object. To create a single-line text object, use the AddText method. This method requires you to enter 3 values: string, insertion point, and text height.

The string is the actual text to display, which can be Unicod, control code, and special characters. The insertion point is an array of variables containing three double-precision numbers representing the three-dimensional WCS coordinates at the text placed in the drawing. The text height is a positive number representing the height of the uppercase text, and the height is measured in the current unit. Apply the above method to create a standard part graphic.

The establishment of the standard parts database is used in the creation of the standard parts database, Access software. Because it is easier to learn than other database management systems (such as Visual FoxPro), an ordinary computer user can master and use it, the specific design process is omitted here for reasons of space. But the most important point is that Access is powerful enough to handle general data management and processing needs.

Software example standard parts selection window. The standard part selection window standard sub-window. Standard part sub-window After the user determines the parameters, click the Generate Graph button, you can directly call AutoCAD to draw the mechanical drawing. AutoCAD will directly form the standard part drawing required by the user, as shown.

Calling AutoCAD4 Conclusion The emergence of ActiveXAutomation technology marks a historic turnaround in AutoCAD's secondary development technology. For the first time, it fully implements OLEAutomation, making it easy for other software to access AutoCAD. Second, AutoCAD has also implemented object-oriented development technology for the first time, allowing users to manipulate all of the AutoCAD objects it provides.

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