Image Tool
Activate the Image tool to open a dialog window that allows to browse the content of your device and select the image file that will be inserted in the
Graphics View. On mobile and Web versions it is also possible to import live images from the camera.
Position and Properties of Images
The position of an image can be absolute on screen or relative to the coordinate system: this setting can be specified in the Position tab of the
Properties Dialog of the image.
GeoGebra creates automatically 2 points at the bottom corners of the image, that can be used to place and resize the image. These points are defined in the settings as:
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Corner 1: position of the bottom left corner of the image
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Corner 2: position of the bottom right corner of the image
You can specify up to three corner points of the image in the Position tab of the
Properties Dialog of the image. This gives you the flexibility
to scale, rotate, and distort images (see also the Corner command). Besides the previous ones, it is possible to define the
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Corner 4: position of the upper left corner of the image
Corner 2 controls the width of the image, and Corner 4 controls the height of the image. Both of them can be set only if Corner 1 has been set before. |
Create three points A, B, and C and insert an image into the Graphics View to explore the effects of the corner points.
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Set point A as the first and point B as the second corner of your image. Activate the
Move tool and drag points A and B to change the width of the image.
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Now, remove point B as the second corner of the image. Set point A as the first and point C as the fourth corner and explore how dragging the points now influences the height of the image.
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Finally, set all three corner points and see how dragging the points distorts your image.
In order to attach your image to a point A, and set its size (e.g. width = 3 and height = 4 units):
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Set Corner 1 to A
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Set Corner 2 to A + (3, 0)
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Set Corner 4 to A + (0, 4)
If you activate the |
You may specify an image as a Background image in the Basic tab of the
Properties Dialog of the image. A background image lies behind
the coordinate axes and becomes non selectable.
In order to change the background setting of an image, open the
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The Opacity of an image can be changed in order to see objects or axes that lie behind the image: use the slider to specify an Opacity value between 0 and 100 in the Color tab of the
Properties Dialog of the image.