LineTanTan example

LineTanTan example
 1# this example creates two arcs in the active block and then creates a line
 2# between a tangent on each of the arcs, the length of the line is then
 3# displayed in the output toolbox
 4
 5# check there is an active drawing
 6if impact.active_drawing.isNone():
 7
 8    # display a message in the output toolbox
 9    impact.gui.output_toolbox.add("Unable to continue: there is no active drawing")
10
11else:
12
13    # create a local variable for the active block
14    ab = impact.active_drawing.active_layer.active_block
15
16    # move to the origin of the active block
17    ab.move_ad(0, 0)
18
19    # create a local variable for the radius
20    radius = 50
21
22    # create a vector for the offset
23    offset = impact.creator.vector(radius,radius)
24
25    # create a clockwise short arc
26    arc1 = ab.arc(offset, radius, 0, 1)
27
28    # move to the origin of the active block
29    ab.move_ad(100, 100)
30
31    # create a clockwise short arc
32    arc2 = ab.arc(offset, radius, 0, 1)
33
34    # create a local variable for the From option
35    to_point = impact.creator.vector(100,100)
36
37    # create a local variables for the Near options
38    near1 = arc1.get_along(0.5)  # the midpoint of the first arc
39    near2 = arc2.get_along(0.5)  # the midpoint of the second arc
40
41    # create the line
42    line1 = ab.line_tan_tan(arc1, arc2, near1, near2)
43
44    # check the line was created
45    if line1 is not None:
46
47        # display the length of the line in the output toolbox
48        impact.gui.output_toolbox.add("Line length: " + str(line1.length))