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Insert Image and Fix Image

Page history last edited by Geoff Roulet 11 years, 4 months ago

Images may be embedded in the Graphics and Graphics 2 views of GeoGebra. Mathematical operations related to these figures can then be laid on top of the pictures. In this case we will use an image of Wolfe Island and the Lake Ontario shore at Kingston.

 

1. Right-click on the Wolfe Island image below and save it on your computer desktop.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Open GeoGebra and select View > Graphics 2

 

3. Hide the original Graphics view by deselecting it by clicking View > Graphics

 

4. Click on the insert icon  and in the drop-down menu select Insert Image

  • Click inside the Graphics 2 window
  • Browse to your image file and Open
  • select the Move tool  and drag the image onto the Graphics 2 window. You may need to drag the edges of the window to change its size.

 

5. Right-click on the image and select Object Properties...

  • Select Color (Yes, I know it should be colour, but as usual we get the US spelling)
  • Set Opacity at about 50%
  • Close the Object Properties... window

 

6. Select the Move tool again and drag the Wolfe Island image down so that the scale lies along the x-axis with the left end of the scale at 0.

 

7. Set the x-axis scale to correspond with the km scale on the Wolfe Island image by:

  • Select the Move Graphics View tool
  • Hover over the x-axis somewhere not over the Wolfe Island image. The cursor will change to a left-right arrow
  • Drag the x-axis point left or right to stretch or compress the scale to match the distance (2km) on the image scale

As the scale is changed the Wolfe Island image may shift and thus you may need to repeat step 6 and the steps here in 7 a couple of times to get a full match of the graph and map scale.

 

8. Once you have the x-axis scale fixed in the Graphics adjustment window make sure that the xAxis:yAxis ratio is 1:1

  • Lock the ratio at 1:1

 

9. Reset the Opacity of the Wolfe Island image to 100% (see 5 above) and move the image to the middle of the Graphics 2 window

 

10. Fix the location and scale of the image by:

  • Right-click the Graphics 2 window and select Graphics in the pop-up window
  • At the very bottom of the Basic tab click Show Mouse Coordinates
  • Drag your cursor to the 4 corners of the image and record (on paper) the coordinates of each
  • Right-click on the image and then select Object Properties...
  • Select Position and enter the missing coordinates for Corner 2 and Corner 4. Do not select Absolute position on Screen

 

11. Right-click on the image and select Fix Object

 

12. Right-click in the Graphics 2 window off the image and in the pop-up window click on Axes to remove the axes.

 

With all of the above we have the Wolfe Island image in GeoGebra in a way that future action, either by you or the students, will not change its scale or position relative to the graph.

 

Your GeoGebra software should now be as in the image below. If you are having difficulties click on the image and Download the resulting GeoGebra file.

 

 

 

 

 

 

 

 

 

 

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