Draft Circle/zh-cn

描述
底图圆形工具通过用户输入的两个点（中心点与半径），或通过拾取切线，或上述若干组合来在当前的工作平面上创建一个圆形. 它将根据Draft Tray中的Draft Linestyle来创建圆形.

This tool works the same way as the Draft Arc tool, except that it creates a full circumference. To draw an ellipse use Draft Ellipse.



How to use

 * 1) Press the  button, or press  then  keys.
 * 2) Click a first point on the 3D view, or type a coordinate and press the  button.
 * 3) Click a second point on the 3D view, or enter a radius value.

The circle can be edited by double clicking on the element in the tree view, or by pressing the button. Then you can move the center and radius points to a new position.

The circle can be turned into an arc after creation, by setting its first angle and last angle properties to different values.

Options

 * The primary use of the circle tool is by picking two points, the centre and a point on the circumference.
 * By pressing, you can select a tangent instead of picking a point. You can therefore construct several types of circles by selecting one, two or three tangents.
 * To enter coordinates manually, simply enter the numbers, then press between each X, Y and Z component. You can press the  button when you have entered the desired values to insert the point.
 * Press or click the checkbox to toggle continue mode. If continue mode is on, the Circle tool will restart after you finish the circle, allowing you to draw another one without pressing the tool button again.
 * Press or click the checkbox to toggle filled mode. If filled mode is on, the circle will create a filled face ; if not, the circle will not make a face.
 * Hold while drawing to force snapping your point to the nearest snap location, independently of the distance.
 * Hold while drawing to constrain your second point horizontally or vertically in relation to the first one.
 * Press or the  button to abort the current command.

Properties
A Circle object shares all properties from a Draft Arc, but some properties only make sense for the circle.

Data

 * : specifies the starting angle of the circle; normally 0&#176;.
 * : specifies the ending angle of the circle; normally 0&#176;.
 * : specifies the radius of the circle.
 * : specifies if the Circle makes a face or not. If it is a face is created, otherwise only the circumference is considered part of the object. This property only works if the shape is a full circumference.
 * For it to be a full circle and  should have the same value; otherwise, a Draft Arc is displayed. The values 0&#176; and 360&#176; aren't considered the same, so if these two values are used, the circle will not form a face.

View

 * : specifies a Draft Pattern with which to fill the face of the circle. This property only works if is, and if  is "Flat Lines".
 * : specifies the size of the Draft Pattern.

Scripting
Draft API and FreeCAD Scripting Basics.

The Circle tool can be used in macros and from the Python console by using the following function:


 * Creates a object with given  in millimeters.
 * can also be a, whose attribute must be a.
 * If a is given, it is used; otherwise the shape is created at the origin.
 * If is, the circle will make a face, that is, it will appear filled.
 * If and  are given in degrees, and have different values, they are used and the object appears as a Draft Arc.

Example: