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link examples evalcurve and parametriccurve

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examples/evalcurve/README.md
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# Example (JKQTPlotter): Plotting Parametric Mathematical Curves as Line Graphs {#JKQTPlotterEvalCurves}
## Basics
This project (see `./examples/evalcurve/`) demonstrates how to plot mathematical functions as line graphs. The functions may be defined as static C functions, C++ functors or c++ inline functions. The functions may simply depend on the parameter `t`, or on `t` and a vector of parameters.
This project (see `./examples/evalcurve/`) demonstrates how to plot mathematical functions as line graphs with `JKQTPXYFunctionLineGraph`. The functions may be defined as static C functions, C++ functors or c++ inline functions. The functions may simply depend on the parameter `t`, or on `t` and a vector of parameters.
The class uses an adaptive algorithm, which determines by the local slope, at how many points (or how close points) the functor has to be evaluated.
If you want to evaluate the parametric function explicitly, you can use `JKQTPXYLineGraph` or `JKQTPXYParametrizedScatterGraph` and have a look at the example [`./examples/parametriccurve`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/parametriccurve).
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# Simple C++ inline function

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examples/parametriccurve/README.md
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# Example (JKQTPlotter): Plotting Parametric Curves {#JKQTPlotterParametricCurves}
This project (see `./examples/parametriccurve/`) demonstrates how to draw parametric curves, using [`JKQTPXYLineGraph`}(../simpletest) and [`JKQTPXYParametrizedScatterGraph`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/paramscatterplot).
This project (see `./examples/parametriccurve/`) demonstrates how to draw parametric curves `[x,y]=f(t)`, using `JKQTPXYLineGraph` and `JKQTPXYParametrizedScatterGraph`, i.e. from a set of coordinates `[xi,yi]`, for which the vector-values function `f(t)` is evaluated explicitly. If you are alloking for an example of implicit drawing by only defining the function `f(t)` and having JKQTPlotter evaluate it automatically and adaptively, you'll have to use `JKQTPXYFunctionLineGraph`, which is explained in [`./examples/evalcurve`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/evalcurve)
The source code of the main application can be found in [`parametriccurve.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/parametriccurve/parametriccurve.cpp). First, the parametric curve (here a [logarithic spiral](https://en.wikipedia.org/wiki/Logarithmic_spiral)) is sampled into two columns containing the x- and y-values along the curve. In addition the radial distance from x=y=0 is added into a third column:
```.cpp