Clicking the right button of the mouse (or Control-Clicking) shows a popup menu (context menu) on the image.
Clicking the right button of the mouse (or Control-Clicking) shows a popup menu (context menu) on the image.
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| (a) Select an area by dragging |
Dragging on an image, you can select the area of the image; See Figure (a). The size and the location of selected area are displayed in the textfield of each window. You can clip a selected area, and you can also apply some operation to the area, such as color replacement.
In order to cancel selection, do single click on the image.
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| (b) Move the area | (c) Resize the area |
Dragging in the selected area moves the area itself; Figure (b).
Little squares (handles) around the area are used to resize the area; Figure (c).
Option-Dragging (or Alt-Dragging) selects a square area. With the preferences panel, you can specify other proportions for Option-dragging; Figure (d).
Shift-Dragging steps 4 pixels at one time. With the preferences panel, you can specify other steps for Shift-dragging.
Command-Dragging moves (scrolls) the image.
In order to select the whole image, type Cmd-A. You can also use the context menu, which is displayed by right-clicking (or control-clicking) on the image.
ToyViewer provides a tool to specify the dimension and the location of the selected area on an image. See Selection Inspector.
When you select a part of an image, by default, the origin of the coordinate system is at the lower left corner of the image. Another coordinate system is also available, in which the origin is at the upper left corner. You can select one of them using Preferences panel.
The coordinate system in which the origin is at the lower left corner is used widely in Mac OS X. On the contrary, the other is used in many GUI systems. For example, the origin of a clickable map of HTML document is at the upper left corner.
You can resize the image in any ratio you like by dragging operation. Double-click on the image, then five blinking marks appears. You can enlarge or shrink the image by dragging marks at the corners. The mark at the center is used to enlarge the image (See Scaling).
With pinch-in or pinch-out gestures on an image, you can resize (magnify) it. This feature is available on Mac OS X 10.6 or later with a multi-touch trackpad or a Magic Mouse.
A wheel is a widget to adjust numeric value, which is like a tuning dial of radio. You can drag it upward or downward, and also can control with the wheel of the mouse. Note that some wheels increase the value by upward dragging and others do by downward dragging.
