# 6.9.6 Contour Plot with Vector Overlay

## Summary

This tutorial will demonstrate how to create a contour plot with vectors overlay.

## What you will learn

This tutorial will show you how to:

• Create and customize a contour graph and its color scale
• Create the XYAM vector graph
• Merge the two graphs

## Steps

This tutorial is associated with <Origin EXE Folder>\Samples\Tutorial Data.opj.
Also, you can refer to this graph in Origin Central. (Select Help: Origin Central menu or press F11 key , and then open Graph Sample: Contour)

### Create the Contour Graph

1. Open Tutorial Data.opj and browse to the Contour Plot with Vector Overlay folder in Project Explorer (PE).
2. Activate the W147 matrix and select Plot> 2D: Contour: Contour - Color Fill in the menu. The graph below will be created:
3. Select Format: Plot Properties to bring up the Plot Details dialog. In the Colormap/Contours tab customize the Contour settings as shown below:
• Click the Level heading to set the following levels at the Set Levels dialog:
• Click the Fill heading to select Load Palette, and choose Temperature from the Palette list in Fill dialog. Click OK.
• Click the Line heading, enable the Color check box under Apply to All and choose Gray in the Color drop-down list. Click OK.
4. Go to Label tab, select the Significant Digits radio button and set the value to 1. Click OK.
5. Let's make preparations for the third section Merge the Two Graphs. First, we am going to hide the axes. Select Format: Layer Properties and in the Display tab deselect the X Axes and Y Axes check boxes. Click OK.
6. Delete X and Y Axis title.
7. To change the color scale, double-click on the scale object to open the Color Scale Control dialog. Do the settings below:
• In the Labels node,
• Set the Font to Verdana.
• Set the Size to 22.
• In the Layout page,
• Select Black Line from the Background drop-down list,
• Set Color bar thickness to 100.
• In the Title page, enter w(ms\+(-1)) in the Title box and set Font Size to 26.
• In the Line and Ticks page, uncheck Show Line and Ticks on Right and Show Border check box
• Click OK and position the color scale in the desired location on the right side of the graph by selecting and dragging it.
The contour plot should now appear as shown below:

### Create the XYAM Vector Graph

1. Activate the WOR81147 worksheet, highlight the last three columns and select Plot > 2D: Vector: Vector XYAM in the menu.
2. Double-click on any vector to bring up the Plot Details dialog on the Vector tab. Use the settings shown below:

Then click OK.
3. To update the axis scales, select Format: Axes: X Axis... to open the dialog and complete the following:
• On the Scale tab, set X From = 1, To = 10 and Value of Increment = 2.
• On the Scale tab, choose Vertical icon in the left panel of Axis dialog. Set the scale of Y as From = 5, To = 95, and Value of Increment = 10.
• Go to the Line and Ticks tab in the Axis dialog. Press Ctrl key to select the Top and Right icon in the left panel. Then check Show Line and Ticks check box, and set the Style of Major Ticks and Minor Ticks to In. The top X and right Y axis will be shown with line and ticks.
• Click OK.
4. At this stage, you may notice that the vectors extend outside the axes (layer frame). To make sure they display within the layer frame, select Format: Layer Properties and in the Display tab check the Clip Data to Frame box. Click OK.
5. Right-click on the legend of the vectors graph, and select Properties... in the context menu to open the Object Properties. Set the dialog as shown below:

### Merge the Two Graphs

The contour and vector graphs are generated by the steps above, and are ready to be merged into one.

1. Minimize or Hide all other graphs except for the contour and vector graphs created using the instructions above. With one of the two graphs active, select Graph: Merge Graph Window... from the main menu.
2. In the Merge Graph dialog, specify the settings as the following:
• Expand the Arrange Settings node, and set the Number of Rows as 1.
• Expand the Spacing (in % of Page Dimension) node, and enter a value of approximately "25" in the Right Margin text box to show the color scale legend from the contour plot. Click OK.
3. To set font type as Verdana for all the objects:
• Set the objects individually, by clicking on the object and selecting Verdana in the Font button in the Format toolbar.
Or
4. The final graph should look something like this: