Explanatory notes

OverDrawing Select on [OverDraw...Choice] one parameter to let it vary, and input values of [Step] (positive value) and [Times](integer), then click [Draw]. Loci by the [Step] for the selected parameter will be drawn. Initial values: Choice a, Step 1, Times 0. Others [Interval x=],[to]: Varyinginteval of x. Initial value is -8 to8. If the actual varying interval is -1 to 1, it will be effective to input so. [y-axis]: Distance of y-axis from left. Pixels. Left 0, Right 950, Default 470. Change value if shift of origin is necessary to horizontal direction. [x-axis]: Distance of x-axis from top. Pixels. Top 0, Bottom 600, Default 300. Change value if shift of origin is necessary to vertical direction. [Size]: Width of major grid lines. Pixels. Default 50. Scale will be greater by the greater value. [Delay]: Index of slow drawing. Default 0(fastest). Slow drawing will sometimes better to understand the equations. Input positive integer to draw slowly. [Precision]: Precision of array of dots to shape the locus. Default 1. [Dots/Line]: Drawing modes of locus. [Dots]:Draw by dots. [Line]:Draw by line. Default "Line". This is useful to make the locus better. [System]: Modes of expression of coordinate system. [Full]:Full expression with minor grids. [Grid]:Expression by major grids without minor grids. [Axes]:Only coordinate axes. [None]:No coordinate system shown. Default "Full". Red marks on the axes: Origin and unit.