This function enables the user to change the attribute of the curve. Click ATTRIBUTE to display the control window at the bottom of the graph window, as shown in Figure 9.4.3.

Figure 9.4.3  Curve Attribute control window

There are many options for the user to change the attribute of the selected curve. The list on the left of the curve window shows the curve names in the graph window. The user should select a desired curve followed by entering a new name in the Curve Name field, and then click Apply to change the name.

1.       ON/OFF

This function enables the user to turn on/off the selected curve(s) in the graph window. The user may select a curve by clicking the name in the list, or select multiple curves by pressing the SHIFT or CTRL key while clicking the mouse button.

2.       PROPERTIES

This function will display a window to present the basic properties (number of points in curve, Min. Y and Max. Y coordinates) of the selected curve. A typical PROPERTIES window is shown in Figure 9.4.4.

Figure 9.4.4  Curve Properties window

3.       CURVE NAME

This function allows the user to change the name of the selected curve.

4.       CURVE STYLE

This function allows the user to change the style of the selected curve. There are four styles available.

SOLID

DASH

DOT

DASH DOT

The default style is SOLID and the user can press the  button on the right of the text box to select a desired type. Click APPLY to update the graph window.

5.       MARK

This function allows the user to change the type of curve mark. There are six types of curve mark available.

      ROUND

      SQUARE

      UP TRIANGULAR

      DOWN TRIANGULAR

      DIAMOND

      NO MARK

The user can press the  button on the right of the text box to select a desired type. Click APPLY to update the graph window.

6.       NUMBER OF CURVE MARKS

This function allows the user to change the number of curve marks on the selected curve. The user can click  button on the right of the text box to select a desired number (2~15) of curve marks.

7.       WIDTH

This function allows the user to change the width of the selected curve. The user can press the  button on the right of the text box to select a desired number (1~5) of curve widths.

8.       LEGEND ON/OFF

    This function allows the user to display or hide the legend in the curve operation control window.

9.       LEGEND LOCATION

This function allows the user to change legend location. Click this button, and then move the legend to the desired location by the mouse.

10.   CURVE COLOUR

This function allows the user to change the color of the selected curve. The user clicks  button right to Curve Color to display the color panel, as shown in Figure 9.4.5. The user may select the desired color for the curve. If the user does not want to change the color after the color panel is displayed, click anywhere outside the color panel to cancel the operation. Click APPLY to update the graph window.

Figure 9.4.5  Color panel

11.   BACKGROUND COLOUR

This function allows the user to change the background color of the graphic window. The default background color is black. The procedure of changing the background is the same as the one described in the CURVE COLOUR function.

12.   AXIS OPERATION

This function enables the user to modify the attribute of the axis including Log X, Log Y, Grid display, and change the height of Y axis.

13.   LOG X and LOG Y (toggle)

This function enables the user to change the X and Y coordinates values to logarithmic values.

14.   GRID

This function enables the user to display X and Y orthogonal grids on the curve. Refer to Figure 9.7 for a typical graph window with GRID option.

15.   MODIFY Y AXIS

This function enables the user to specify the height of the Y-axis in the graph window. Click anywhere along the Y-axis to define a new height. The user can click Modify Axis again to cancel the operation.

16.   X TITLE

This function allows the user to modify the title of X-axis. It is located below the X-axis.

17.   Y TITLE

This function allows the user to modify the title of Y-axis. It is located at the left side of the X-axis.

18.   MIN. MAX. X/Y

This function allows the user to change the range of X and Y coordinates. The program plots only the portion of the curve(s) within the defined coordinate range.

19.   NEW VALUE

This function allows the user to modify the Y value of a selected point. Click a point on a curve to display the x and y coordinates in the corresponding text boxes. The value in X text box cannot be modified. The user can modify the value in the Y text box.

20.   MODIFY Y

This function allows the user to modify Y value. After the user selects a point on a curve, the Modify Y button is pitched on. The user can click any location to modify Y value by the mouse, and click the Modify Y button again to exit the operation.