In the 1980s, the small and lightweight HP 7470 used an innovative "grit wheel" mechanism which moved only the paper. Hewlett Packard and Tektronix created desk-sized flatbed plotters in the late 1970s. A later change was the addition of an electrically controlled clamp to hold the pens, which allowed them to be changed and thus create multi-colored output. This had the disadvantage of being somewhat slow to move, as well as requiring floor space equal to the size of the paper, but could double as a digitizer. Computervision's Interact I) involved attaching ball-point pens to drafting pantographs and driving the machines with motors controlled by the computer. the Calcomp 565 of 1959) worked by placing the paper over a roller which moved the paper back and forth for X motion, while the pen moved back and forth on a single arm for Y motion. For example to plot X*X in HP 9830 BASIC, the program would beġ0 SCALE -1,1,1,1 20 FOR X =-1 to 1 STEP 0.1 30 PLOT X, X*X 40 NEXT X 50 PEN 60 ENDĮarly plotters (e.g. These would establish scaling factors from world coordinates to device coordinates, and translating to the low level device commands.
#Plotter drawing sizes software
Programmers in FORTRAN or BASIC generally did not program these directly, but used software packages such as the Calcomp library, or device independent graphics packages such as Hewlett-Packard's AGL libraries or BASIC extensions or high end packages such as DISSPLA. The two common ASCII-based plotter control languages are Hewlett-Packard's HPGL2 or Houston Instruments DMPL with commands such as "PA 3000, 2000 PD". This is not the case of the line art on a plotter, where a number of printer control languages were created to send the more detailed commands like "lift pen from paper", "place pen on paper", or "draw a line from here to here". This makes it fairly easy to control, simply sending the text to the printer is usually enough to generate a page of output. Traditionally, printers are primarily for printing text. When computer memory was very expensive, and processor power was very slow, this was often the fastest way to produce color high-resolution vector-based artwork, or very large drawings efficiently. Pen Plotters are incapable of creating a solid region of color but can hatch an area by drawing a number of close, regular lines. Pen plotters can draw complex line art, including text, but do so very slowly because of the mechanical movement of the pens. This means that plotters are restricted to line art, rather than raster graphics as with other printers. Pen plotters print by moving a pen across the surface of a piece of paper. Those are pen plotters and electrostatic plotters. A plotter is a vector graphics printing device that connects to a computer.
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