Dotted Line

Author: Kevin (Gali) Baler
Date: 2003/11/10: First release
2010/09/30: Updated to use latest ImageJ API
Installation: Drag and drop Dotted_Line.class onto the "ImageJ" window.
Description: This plugin draws dashed lines based on the current selection. Users can specify the color, line width, and the pattern of the dashes. Choose the color by double clicking on the color picker tool and selecting the desired color. The line width box sets the width of the line. The dash pattern box takes the list of numbers and turns them into dashes or spaces. The first number is the pixel length of the first dash and the second number is the pixel length of the space.

Dotted Line

The example below shows some of the variations that can be made to the dashed lines. The red dashes show examples of dashed lines with all the tools. The blue dashes are examples of the various line width options and the green dashes illustrate how the dash pattern works. The numbers next to the blue and green dashes are the values that were used to draw those dashes.

Dotted Line

Notes: When making dashed lines, ImageJ converts the image to an RGB image. So if a dotted line is drawn on an 8-bit image, the image turns into an RGB image. With the undo command, both, the dashed line and the RGB color will be undone. However, once more than a single line has been drawn, the undo command will undo only the last line that was drawn but the image will remain in RGB.

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