Cross-Section Overlay

All of the following instructions are based on the use of the Overlay Tool Bar. If your overlay tool bar becomes hidden, click on "Overlay>Show Tool Bar".

Creating Lines

To create lines in Petra, simply click on the pencil icon on the toolbox. Then click where you want the beginning of the line to start. Clicking the left mouse button again will add control points, while clicking the right button will end the line. After you finish adding control points on the line, the Overlay Line Attributes dialogue box will open.

Editing Lines

To select and edit pre existing lines, click on the red arrow on the toolbar which brings up a crosshair for your mouse on the map module and then select the line you wish to edit with one click of the left mouse button. This changes the color of your line to blue and shows all the control point points in the line. Occasionally after making many changes to lines, it is necessary to redraw the screen to see the changes or to continue editing.

Moving individual control points	Change the location of any blue boxed "control point" by clicking and dragging it to a new position.
Moving whole lines	To move a whole line unchanged, press ALT and click on the line with the right mouse button.
Copying a line	Click on the copy button that looks like . To paste the line, click on the button and place the text.

Creating Text

To set text, click on the "abc" icon on the toolbar. Petra first asks you to establish a baseline that shows where you want the text and then builds a rectangle to establish the height of the text.

Editing Text

To edit pre existing text, first click on the red arrow on the toolbar, which brings up a crosshair for your mouse on the map module. Select the text you wish to edit with one click of the left mouse button; this brings up a blue box around your text and allows you to edit the text. Sometimes after manipulating a piece of text multiple times, it may become necessary to refresh the screen to see the blue box that highlights text.

Editing features like the content of the text displayed, the height of the text in map units, angle in degrees, overlay layer, text color and font, and text justification - double click anywhere inside the blue box. This brings up the Overlay Text Attributes dialogue box that allows you precise control over features, including degree of angle and text height.

Changing the location of the text	Press ALT and right click somewhere inside the box and drag it to the new location.
Changing the angle of the text manually	Press ALT and right click on one of the control points that establish the baseline on the bottom of the blue box.
Copying a text box	Click on the copy button. To paste the text, click on the button and place the text.

Importing an Image File

To add an image file, simply click on the "Add Image File" button on the toolbar that looks like _bm61 . After clicking this, Petra will ask you to establish a rectangle on the map screen where the image file will be placed. Then, Petra will ask you for the location of the file and the layer you want it to go into. Various scaling options are available under the "Options" tab.

Adding a Fault Line

To add an fault line, simply click on the fault line icon on the mapping toolbox that looks like _bm62 . This will change your mouse to a crosshair. To add the fault, first click on position for the beginning of the fault and then click again to place more nodes on the fault. The right mouse button ends the process of adding nodes to the fault. After this, click to the left and the right of the fault to define throw.

Fault lines can be moved and edited just like a line. Select it with the red arrow selecting tool - Right clicking it will move the entire fault, while left clicking a single node will stretch the line.

Be careful to place the fault lines away from the well lines. Crossing a well with a fault line will generate an erroneous image.