You can create circle by several construction types. Click View, Geom Curve to toggle the display of individual curve.
To create a circle:
Click Circle (Curve toolbar) or click Geometry, Curve, Circle.
In the dialog , select the type of you want to create the circle:
Parameters. Create a circle by center, normal and radius parameters. You can also sketch circles onto any plane when "Sketch on Plane" is checked. "Radius" button is an option to change its value to "Radius", "Circumference" or "Area".
Point/Axis. Create a circle by select a center point, an axis and define the radius. You can select any curve(non-linear curve), and the selected point will be projected to the edge and the axis will be the tangent vector of the projection position on the curve. You can also check the "Rotate" option, and the selected point will rotate with the axis. "Radius" button is an option to change its value to "Radius", "Circumference" or "Area".
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a. Select a vertex and an edge. The vertex is one end of the edge. The circle's center will locate at the vertex and the normal of the circle's plane is the tangent of the vertex on the edge |
b. Select a vertex and an edge. The vertex is not on the edge. The circle's center will locate at the vertex and the normal of the circle's plane is the tangent of the vertex projected on the edge |
c. Result of check "Roate" option. |
Coordinate System . Create a circle by selecting a coordinate system, and define the radius. "Radius" button is an option to change its value to "Radius", "Circumference" or "Area".
3 Points. Create a circle by selecting 3 points. When "Inscribed Circle" is checked, it will create an inscribed circle. "Center/Start/End" will make a circle by different meaning. Suppose the three points are P1, P2 and P3. P1 will be the center of the circle, and P2 will locate at the bound of the circle. That means the radius will be |P2-P1|. P3 will be used to calculate the axis vector of the circle. The axis vector is (P2-P1)*(P3-P1).
Tan Line/Circle. Create circles which are tangent with the selected line and another circle, it also need to define the radius. "Radius" button is an option to change its value to "Radius", "Circumference" or "Area".
a. Select a line and a circle |
b. Create tangent circles using radius 0.3 |
3 Lines. Create circumscribed or inscribed circles by three lines.
a. Circumscribed circle |
b. Inscribed circle |
Center/Tangent. Select a point and a line. The point will be the center of the circle, and the circle will be tangent with the selected line.
Circle by Center/Tangent |