Arc: Angle, Centre, Point

Applicability:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS ActiveX Modeller

Ribbon Group:

Create-Advanced-Arc

Conditions for use:

• Item Class: LineString
• Minimum number selected: None
• Minimum item status: Editable

Associated commands:

• 3 Points
• Angle Point Point
• Centre, Point, Point
• Radius, Centre, Point, Point

Description:

 Angle, Centre, Point constructs a LineString item from an arc through a given angle around a known centre point. First you are prompted to enter the angle. This angle may be positive for anticlockwise arcs, or negative for clockwise arcs. You will be prompted for the centre of the arc, then a position for one end of the arc.

Example:

1. Select Angle, Centre, Point.
   
   
2. The Arc angle dialog will be displayed:
   
   
   
   Type in the angle of the arc. A positive number will draw an arc anticlockwise; a negative number will draw in a clockwise direction. Click OK.
   
   
3. Click the position for the centre of the arc (point 1 in the diagram below). Now you will see an arc of the specified length rotating around this centre point as you move the cursor.
   
   
4. Click the point at which the arc starts (point 2 in the diagram below). This fixes the location and radius of the arc.

The following diagram shows four arcs, each with the same angle (90 degrees) and centre:

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