Operation Manual

Chapter 8: Draw Instructions 125
Before Drawing on a Graph
The DRAW instructions draw on top of graphs. Therefore, before you use the DRAW instructions,
consider whether you want to perform one or more of the following actions.
Note: DRAW will not change the Background Image Vars.
• Change the mode settings on the mode screen.
• Change the format settings on the format screen. You can press y . or use the shortcut on
the mode screen to go to the format graph screen.
• Enter or edit functions in the Y= editor.
• Select or deselect functions in the Y= editor.
• Change the window variable values.
• Turn stat plots on or off.
• Clear existing drawings with ClrDraw (this will not impact Background Image Vars).
Note: If you draw on a graph and then perform any of the actions listed above, the graph is replotted
without the drawings when you display the graph again. Before you clear drawings, you can store them
with StorePic. This stores the drawings and any graphs, plots and axes. Background Images are not part
of the Pic Var layer.
Drawing on a Graph
You can use any DRAW menu instructions except DrawInv to draw on Func, Par, Pol, and Seq graphs.
DrawInv is valid only in Func graphing. The coordinates for all DRAW instructions are the display’s
x-coordinate and y-coordinate values.
You can use most
DRAW menu and DRAW POINTS menu instructions to draw directly on a graph, using
the cursor to identify the coordinates. You can choose STYLE to change the color and line style (when
applied). The Status bar tells you which DRAW or POINT command is active. You also can execute these
instructions from the home screen or from within a program. If a graph is not displayed when you
select a
DRAW menu instruction, the home screen is displayed.
Clearing Drawings
Clearing Drawings When a Graph Is Displayed
All points, lines, and shading drawn on a graph with DRAW instructions are temporary.
To clear drawings from the currently displayed graph, select
1:ClrDraw from the DRAW menu. The
current graph is replotted and displayed with no drawn elements.
Clearing Drawings from the Home Screen or a Program
To clear drawings on a graph from the home screen or a program, begin on a blank line on the home
screen or in the program editor. Select 1:ClrDraw from the DRAW menu. The instruction is copied to
the cursor location. Press Í.
When
ClrDraw is executed, it clears all drawings from the current graph and displays the message
Done. When you display the graph again, all drawn points, lines, circles, and shaded areas will be gone.