Using the Using the
Using the DRAW DRAW DRAW DRAW Menu Menu Menu Menu
DRAW Menu DRAW MenuDRAW Menu DRAW Menu
To display the DRAW menu, press y <. The TI-84 Plus’s interpretation of these instructions depends on whether you accessed the menu from the home screen or the program editor or directly from a graph.
DRAW POINTS STO
1: ClrDraw Clears all drawn elements.
2: Line( Draws a line segment between 2 points.
3: Horizontal Draws a horizontal line.
4: Vertical Draws a vertical line.
5: Tangent( Draws a line segment tangent to a function.
6: DrawF Draws a function.
7: Shade( Shades an area between two functions.
8: DrawInv Draws the inverse of a function.
9: Circle( Draws a circle.
0: Text( Draws text on a graph screen.
A: Pen Activates the free-form drawing tool.
Chapter 8: Draw Instructions 187 Before Drawing on a Graph
Before Drawing on a GraphBefore Drawing on a Graph 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.
• Change the mode settings on the mode screen.
• Change the format settings on the format 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.
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.
Drawing on a Graph Drawing on a GraphDrawing on a Graph 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 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.
Chapter 8: Draw Instructions 188
Clearing Drawings Clearing Drawings Clearing Drawings Clearing Drawings
Clearing Drawings When a Graph Is Displayed Clearing Drawings When a Graph Is DisplayedClearing Drawings When a Graph Is Displayed 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 Clearing Drawings from the Home Screen or a ProgramClearing Drawings from the Home Screen or a Program 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.
Note: Before you clear drawings, you can store them with StorePic.
Chapter 8: Draw Instructions 189
Drawing Line Segments Drawing Line Segments Drawing Line Segments Drawing Line Segments
Drawing a Line Segment Directly on a Graph Drawing a Line Segment Directly on a GraphDrawing a Line Segment Directly on a Graph Drawing a Line Segment Directly on a Graph
To draw a line segment when a graph is displayed, follow these steps.
1. Select 2:Line( from the DRAW menu.
2. Place the cursor on the point where you want the line segment to begin, and then press Í.
3. Move the cursor to the point where you want the line segment to end. The line is displayed as you move the cursor. Press Í.
To continue drawing line segments, repeat steps 2 and 3. To cancel Line(, press ‘.
Drawing a Line Segment from the Home Screen or a Program Drawing a Line Segment from the Home Screen or a ProgramDrawing a Line Segment from the Home Screen or a Program Drawing a Line Segment from the Home Screen or a Program
Line( also draws a line segment between the coordinates (X1,Y1) and (X2,Y2). The values may be entered as expressions.
Chapter 8: Draw Instructions 190 Line(X1,Y1,X2,Y2)
To erase a line segment, enter Line(X1,Y1,X2,Y2,0)
Drawing Horizontal and Vertical Lines Drawing Horizontal and Vertical Lines Drawing Horizontal and Vertical Lines Drawing Horizontal and Vertical Lines
Drawing a Line Directly on a Graph Drawing a Line Directly on a GraphDrawing a Line Directly on a Graph Drawing a Line Directly on a Graph
To draw a horizontal or vertical line when a graph is displayed, follow these steps.
1. Select 3:Horizontal or 4:Vertical from the DRAW menu. A line is displayed that moves as you move the cursor.
2. Place the cursor on the y-coordinate (for horizontal lines) or x-coordinate (for vertical lines) through which you want the drawn line to pass.
Chapter 8: Draw Instructions 191 3. Press Í to draw the line on the graph.
To continue drawing lines, repeat steps 2 and 3.
To cancel Horizontal or Vertical, press ‘.
Drawing a Line from the Home Screen or a Program Drawing a Line from the Home Screen or a ProgramDrawing a Line from the Home Screen or a Program Drawing a Line from the Home Screen or a Program
Horizontal (horizontal line) draws a horizontal line at Y=y. y can be an expression but not a list.
Horizontaly
Vertical (vertical line) draws a vertical line at X=x. x can be an expression but not a list.
Verticalx
To instruct the TI-84 Plus to draw more than one horizontal or vertical line, separate each instruction with a colon (:).
Chapter 8: Draw Instructions 192
Drawing Tangent Lines Drawing Tangent Lines Drawing Tangent Lines Drawing Tangent Lines
Drawing a Tangent Line Directly on a Graph Drawing a Tangent Line Directly on a GraphDrawing a Tangent Line Directly on a Graph Drawing a Tangent Line Directly on a Graph
To draw a tangent line when a graph is displayed, follow these steps.
1. Select 5:Tangent( from the DRAW menu.
2. Press † and } to move the cursor to the function for which you want to draw the tangent line. The current graph’s Y=function is displayed in the top-left corner, if ExprOn is selected.
3. Press ~ and | or enter a number to select the point on the function at which you want to draw the tangent line.
4. Press Í. In Func mode, the X value at which the tangent line was drawn is displayed on the bottom of the screen, along with the equation of the tangent line. In all other modes, the dy/dx value is displayed.
Chapter 8: Draw Instructions 193 Note: Change the fixed decimal setting on the mode screen if you want to see fewer digits displayed for X and the equation for Y.
Drawing a Tangent Line from the Home Screen or a Program Drawing a Tangent Line from the Home Screen or a ProgramDrawing a Tangent Line from the Home Screen or a Program Drawing a Tangent Line from the Home Screen or a Program
Tangent( (tangent line) draws a line tangent to expression in terms of X, such as Y1 or X2, at point X=value.X can be an expression. expression is interpreted as being in Func mode.
Tangent(expression,value)
Chapter 8: Draw Instructions 194
Drawing Functions and Inverses Drawing Functions and Inverses Drawing Functions and Inverses Drawing Functions and Inverses
Drawing a Function Drawing a FunctionDrawing a Function Drawing a Function
DrawF (draw function) draws expression as a function in terms of X on the current graph.
When you select 6:DrawF from the DRAW menu, the TI-84 Plus returns to the home screen or the program editor. DrawF is not interactive.
DrawFexpression
Note: You cannot use a list in expression to draw a family of curves.
Drawing an Inverse of a Function Drawing an Inverse of a FunctionDrawing an Inverse of a Function Drawing an Inverse of a Function
DrawInv (draw inverse) draws the inverse of expression by plotting X values on the y-axis and Y values on the x-axis. When you select 8:DrawInv from the DRAW menu, the TI-84 Plus returns to the home screen or the program editor. DrawInv is not interactive.
DrawInv works in Func mode only.
Chapter 8: Draw Instructions 195 DrawInvexpression
Note: You cannot use a list in expression to draw a family of curves.
Shading Areas on a Graph Shading Areas on a Graph Shading Areas on a Graph Shading Areas on a Graph
Shading a Graph Shading a GraphShading a Graph Shading a Graph
To shade an area on a graph, select 7:Shade( from the DRAW menu. The instruction is pasted to the home screen or to the program editor.
Shade( draws lowerfunc and upperfunc in terms of X on the current graph and shades the area that is specifically above lowerfunc and below upperfunc. Only the areas where lowerfunc < upperfunc are shaded.
Xleft and Xright, if included, specify left and right boundaries for the shading. Xleft and Xright must be numbers between Xmin and Xmax, which are the defaults.
Chapter 8: Draw Instructions 196 pattern specifies one of four shading patterns.
patres specifies one of eight shading resolutions.
Shade(lowerfunc,upperfunc[,Xleft,Xright,pattern,patres])
Chapter 8: Draw Instructions 197
Drawing Circles Drawing Circles Drawing Circles Drawing Circles
Drawing a Circle Directly on a Graph Drawing a Circle Directly on a GraphDrawing a Circle Directly on a Graph Drawing a Circle Directly on a Graph
To draw a circle directly on a displayed graph using the cursor, follow these steps.
1. Select 9:Circle( from the DRAW menu.
2. Place the cursor at the center of the circle you want to draw. Press Í.
3. Move the cursor to a point on the circumference. Press Í to draw the circle on the graph.
Note: This circle is displayed as circular, regardless of the window variable values, because you drew it directly on the display. When you use the Circle( instruction from the home screen or a program, the current window variables may distort the shape.
To continue drawing circles, repeat steps 2 and 3. To cancel Circle(, press ‘.
Drawing a Circle from the Home Screen or a Program Drawing a Circle from the Home Screen or a ProgramDrawing a Circle from the Home Screen or a Program Drawing a Circle from the Home Screen or a Program
Circle( draws a circle with center (X,Y) and radius. These values can be expressions.