This action popup the property dialog with which the user can view and edit the proeprty of an element.
Basic Property
This show the default color of current elements. The above image shows the basic property of a free point. The default color is RED.
This show the line type of the element. If this element doesn't use any line type( for example, a point doesn't have this attribute), then this property doesn't take effect.
This show the line width of the element. If this element doesn't use any line type( for example, a point doesn't have this attribute), then this property doesn't take effect.
The property of an point includes: Name, Radius, X coordinate, Y coordinate, Freezed.
Name: the name of the point. The name can be changed according to the user.
Radius: the radius of the point. The default radius is -1, indicating that this point use the predefined radius(4pt)
X coordinate: The x coordinate of the point.
Y coordinate: The y coordinate of the point.
Freezed: This decides if the point is freezed. Please refer the command Freeze for detail.
Name: the name of the point. The name can be changed according to the user.
Point on Line: List all the points which are on line.
x1, y1: the coordinate of the first point.
x2, y2: the coordinate of the second point.
Name: the name of the circle. The name can be changed according to the user.
Point on circle: List all the points which are on line.
Center: the point which acts as the center of the circle.
Center X : the x coordinate of the center.
Center Y : the y coordinate of the center.
Radius: The radius of the circle.
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