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# Rotation of a Plot on a Plotter

IP.com Disclosure Number: IPCOM000087794D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 26K

IBM

## Related People

Hughes, MA: AUTHOR [+1]

## Abstract

When a hard copy of a diagram, map or drawing is required on a plotter, the size available is limited by the width of the paper and of the plotter. Thus with maps which are twice as wide as high, the maximum picture size on an 18-inch wide plotter is 18 inches by 9 inches. However by rotating the coordinates of the data through 90 Degrees, the picture size can be enlarged to 36 inches by 18 inches.

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Rotation of a Plot on a Plotter

When a hard copy of a diagram, map or drawing is required on a plotter, the size available is limited by the width of the paper and of the plotter. Thus with maps which are twice as wide as high, the maximum picture size on an 18-inch wide plotter is 18 inches by 9 inches. However by rotating the coordinates of the data through 90 Degrees, the picture size can be enlarged to 36 inches by 18 inches.

Fig. 1 shows two straight lines :AB and BC. If it was desired to plot the line BD on the plotter, there would be insufficient width. However, by transposing the coordinates of points A, B, C and D, causing the picture to be rotated, the line BC can be extended to D along the length of the paper. This is shown in Fig. 2. In the coordinate transformation: X/1/ = W - Y Y/1/ = X.

Using a picture oriented as in Fig. 2, the picture can be enlarged by the ratio X/1/ over Y using the same width of paper and plotter.

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