Intersection (of non-intersecting linesegments)
You first have to select two line segments. The tool will always lets you select two segments. If you select a third one, it deletes the first segment selection. Please bear in mind that you have appropriate snapping settings values. You can select segments either from lines or polygons.
You can now create an intersection point that will be drawn in a memory layer. It will create also a line that joins the two points furthest away with the intersection point.
Arc Intersection
This tool lets you calculate an arc intersection from two distances to two points. You have to select two points. If you select a third one, the first selection will be canceled. Please bear in mind that you have appropriate snapping settings values and the "on the fly" crs transformation should not be enabled.
When you have selected two points you can calculate the arc intersection by entering the distance (in meters) to the two selected points. The intersection point(s) will be drawn in a memory layer.
Orthogonal Line
This one is for creating a orthogonal line (and the intersection point) from a point to a linesegment. You first have to select a vertex (which has to be in the current layer) and then the segment from a background layer. The selector will toggle between vertex and segment selections. Please bear in mind that you have appropriate snapping settings
When you have selected a vertex and a segment you can create the orthogonal line and the intersection point. These two objects will be drawn in a memory layer.
Rectangular Points
This function lets draw points from orthogonal measurements to a base line. You first have to select the line segment.
If you selected the base line you can simply enter the abscissa (x) and the ordinate (y). The origin is always the left point of base line. But you can invert the origin by checking the checkbox.
Orthogonal Traverse
With this function you can draw/calculate an orthogonal traverse between two points which you have to select first.
After selecting the two points you can calculate the orthogonal traverse by entering the distances you measured in one line, e.g. "3.5 -2.46 -12.33 4.5". This describes an orthogonal traverse with four distances. If you want to turn left you have to use negative values.
Show Azimuth
With this function you can calculate the azimuth between two points which you have to select first.
After selecting the two points you can calculate the azimuth just by pushing the button.
Rotate Feature
This function is for rotating features. You first have to select the feature you want to rotate and a vertex which will be the centre of rotation. The vertex does not have to be on the current layer.
After selecting the feature and the vertex you can enter the angle of rotation (in degrees).
Parallel Line
With this function you can create parallel lines. First you have to select a single line segment.
After selecting the line segment you can either create a parallel line by entering a fixed length or selecting a vertex point.
Circular Arc
This function creates a segmentized circular arc. You first have to select three points which will define the circular arc; the starting point, one point on the circular arc and the end point.
After selecting the three points you can create the segmentized circular arc. You can choose the method of the segmentation (pitch or angle) and the tolerance in CadTool - Settings.
Modify Circular Arc
You can modify the circular arc you created with the function above. This tool is only available if there is a linestring layer in editing mode. You can either move one of the arc points - which will change the diameter of the circular arc - or move the starting/end point. The latter method will define the circular arc with the moving point, the mean arc point and the other starting/end point.
Circular Arc Digitizing
This function is only available if there is a polygon or a linestring layer in editing mode otherwise the button is greyed out. You have to hold the ctrl key pressed when adding the three arc points (starting point, arc points, end point). After adding the third one it will draw the circular arc. There will no attribute window pop up.
Spline Digitizing
This function is only available if there is a polygon or a linestring layer in editing mode. Digitized points are interpolated using Hermite spline with optional tightness. The spline is converted to linestring using tolerance. Both tightness and tolerance may be changed in settings.
Orthogonal Digitizing
This function is only available if there is a polygon or a linestring layer in editing mode otherwise the button is greyed out. You have to press the ctrl key to draw lines or polygons with square angles. To close a polygon you have 2 alternatives:
1. You can release the ctrl key before closing the polygon with a right mouse click. You have to draw by eye when you want a square angle.
2. When you have the ctrl key pressed when closing the polygon, the first point of the polygon will be moved till the last angle is square.
There will no attribute window pop up.