GraphClick Help > Contents

Adjust Coordinates (⌘0)

This option let the user choose its preferred way of adjusting the coordinates of the graph by selecting different positions on the image and entering the corresponding coordinates.

Modify Coordinate Frame

Select this tool to modify the position of the dotted frame indicating the position of the coordinate limits. You can then drag any side or corner of the frame to match the desired position.

When dragging a corner, keep the ⌘ key down to move the selected corner only (e.g. if the image is deformed).

Select Points (⌘1)

Use this tool to select one or several points, or to move the selected points. Keep the ⇧ key down to add points to the current selection. You can also use the arrow keys to move the selected points (keep ⇧ down to move by 1/5 pixel).

To select all the points of the current data set, select Edit > Select All (⌘A). To delete the selected points, select Edit > Delete (or hit Backspace).

Add Point (⌘2)

Select this tool to add points to the current data set by clicking on the graph image. The points are added after the last selected point.

Keep the ⇧ key down to select a point. Keep the ⌘ key down to add error bars to the selected point.

Guide

When using this tool, a visual guide is displayed to help the user better locate the center of a point. To hide the guide, select Display > Guide (⇧⌘G). To customize the guide, select Display > Guide Settings (⌥⇧⌘G).

How to use the keyboard

If you want to use the keyboard to precisely adjust the position of the mouse cursor, go to System Preferences > Universal Access > Mouse & Trackpad and turn the Mouse Keys option on. (With a laptop, the numeric keypad is accessible with the fn or num lock key.)

Add Points on Horizontal Curve (⌘3)

Select this tool and click on a horizontal curve to automatically digitize it. The line thickness is averaged vertically, so that the data points are always in the middle of the line. For dotted or dashed lines, as well as when the curve intersects other lines, define first a mask by selecting Mask > Brush (⌘B) or Mask > Rectangle (⌘R). When digitizing a curve with this tool, you can also specify the number of points or the spacing, as well as the horizontal offset.

Add Points on Curve (⌘4)

Select this tool and click on a curve to automatically digitize it. The line thickness is averaged, so that the data points are always in the middle of the line. With this tool, dashed lines can automatically be digitized without defining a mask.

Add Points on Bars (⌘5)

Select this tool and click on a bar to automatically digitize all similar bars found in the image. You can then choose which positions (minimum, mean or maximum along any axis) you want to include.

Add Points on Symbols (⌘6)

Select this tool and click on a symbol to automatically digitize all similar symbols found in the image.

Important notice: If the symbols have a unique color, try first the previous tool (Add Points on Bars) since it is much faster and may actually detect the symbols adequately (see the section Detecting bars vs. symbols)

Add Points on Perimeter of Area (⌘7)

Select this tool and click on an area to automatically digitize its perimeter.

Add Points on Perimeters of Areas (⌘8)

Select this tool and click on an area to automatically digitize the perimeters of each similar area found in the image. To display the perimeters and areas of all data sets, display the Area Info window (⌃⌘I).

Learn more about automatic detection

Deform Axis

Select this tool and click on the ordinate (y) axis to adjust the coordinate frame to a deformed axis.

Learn more about deformations

Image Eraser

Select this tool to erase some parts of the image which may reduce the performance of the automatic detection. The size of the eraser can be changed by modifying the brush size (for instance from the window toolbar).

Zoom

You can change the zoom of the view from the corresponding menu in the lower left corner of the window, or by selecting Display > Zoom > Zoom In (⌘+) or Zoom Out (⌘-).

To move the displayed graph region, use the scrollers or keep the ⌥ key down and drag the image.

Select Display > Zoom > Actual Size (⌥⌘1) to restore a zoom factor of 100%. Select Display > Zoom > Fit In Window (⌥⌘=) to adjust the zoom factor to display the entire image.