| 摘要 |
PURPOSE:To faithfully plot a straight line by moving a straight line in parallel in horizontal and vertical directions to convert it to a new straight line and expanding picture element strings on first and last lattice lines and lattice lines between them of the straight line in a memory by the number of lattice lines. CONSTITUTION:A plotting processor 1 moves a straight line in parallel in horizontal and vertical directions in the range of a lattice interval to convert it to a new described straight line. The number of horizontal or vertical lattice lines where the described straight line will be plotted is obtained. The picture element string start dot and the number of picture elements on the lattice line to be plotted in the lowermost or leftmost position of the drawn straight line are obtained to plot picture elements in a picture element memory 2, and picture element string start points and numbers of picture elements on intermediate lattice lines are obtained to describe picture elements in the memory 2, and the picture element string start dot and the number of picture elements on the lattice line to be plotted in the uppermost or rightmost position of the plotted straight line are obtained to plot picture elements in the memory 2, thus terminating plotting of the straight line in the picture element memory 2. |
