Apparatus for making a hard copy record on a recording medium from a series of data points with a line scan recorder which records an area on the recording medium in a predetermined number of line scans, comprising in combination:
- means for recording in a region on said medium with parallel line scans along one of two intersecting axes, a region between two adjacent line scan positions defining a finite band;
- means for determining the distance between two data points along the one of said two intersecting axes;
- means for determining the distance between said two data points along the other of said two axes;
- means to divide said distance along said one axis into a predetermined number of increments;
- means to divide said distance along said other axis into a predetermined number of increments;
- means for determining the position of said medium relative to said recording means along said one axis;
- means including said dividing means for determining interpolated values along said one axis between said data points;
- means including said dividing means for determining interpolated values along said other axis between said data points;
- means for determining the interpolated values along said one axis falling within said finite band;
- means for determining the interpolated values along said other axis corresponding with the interpolated values along said one axis that are within said finite band;
- and
- means responsive to said means for determining interpolated values along said other axis within said finite band for recording along said other axis a line whose length is a function of the interpolated values along said one axis falling within said finite band.