easily define spline
This is a very simple
the example curves drawn on planes
make dimensions the distance of points from each other and from the Centre of reference
then we can give your relationship vertical or horizontal, depending on what we need
then select the dimension and clicking on the arrow to the point of the curve, we can give the value of the length
Another way to define the account to which the arrow is a curve while the dimension, select the arrow
then mark the line the center of a horizontal/vertical passing through the Centre of the coordinate system
and then after we enter the value of the angle variance arrow to the point of the curve
or we make by selecting the arrow and in the properties panel finding, quoted below, we enter the value of the angle in mind that we enter values from 0 to 180 and from 0 to-180 if we wanted to approach it in a second page
a little bit differently, we will sketch in 3D when you draw a curve, click anoder the arrow and then we can give its relationships relative to the reference axis, for example, in relation to the axis X
or with relation to the axis Y
and with relation to the axis Z
in the axis of the curved the arc of the fold perpendicular to the direction of the draw
or we can used when you select the arrow to its properties and fold it into angles to the direction of its drawing
then at an angle perpendicular to the direction of the draw
in the sketch 3d we give the value of our arrows in the same way as the sketch plane
If you work with spline in solidworks, it is easier to achieve the intended goal of seeing the crest of curvature we can display it by right-clicking the viewing panel to help tools and selecting functions "show crest of curvature"
either in the properties panel on the left side of the screen specifying respectively pane with "show curvature"
then the Panel can make the scales and the density of the displayed features
so here's how easily and pleasantly we define the curves.
P.S: I'm very sorry for any mistakes in spelling
Success in creation of unusual projects ;-)