Trident Help

Classic Graphing 84 manual · Chapter 23 of 25

Drawing on the graph

Draw lines, circles, points and text on the graph screen with the DRAW menu, and shade distribution areas.

23.1The DRAW menu#

Press 2ndDRAWprgm for DRAW. Choose a command, type its numbers (they use the coordinates of the current window), close the bracket and press enter. The calculator shows the graph with your drawing. Drawings stay until ClrDraw. The same commands can be used in programs.

The DRAW tab. The display shows: [DRAW] POINTS / 1:ClrDraw / 2:Line( / 3:Horizontal / 4:Vertical / 5:Circle( / 6:Text( / 7↓ShadeNorm(.
The DRAW tab.
The POINTS tab. The display shows: DRAW [POINTS] / 1:Pt-On( / 2:Pt-Off(.
The POINTS tab.
ItemCommandDraws
1ClrDrawErases all drawings.
2Line(Line(x1,y1,x2,y2) a segment between two points.
3HorizontalHorizontal y: a horizontal line at y.
4VerticalVertical x: a vertical line at x.
5Circle(Circle(x,y,radius) a circle.
6Text(Text(row,column,"text") text at a pixel position.
7, 8ShadeNorm(, ShadeT(Shaded areas under normal and t curves (see distributions).
POINTS 1, 2Pt-On(, Pt-Off(Pt-On(x,y) turns a point on; Pt-Off( removes it.

23.2Draw a line segment#

Example 23.1

A diagonal line

  1. Press zoom, 6 for the standard window, go home with 2nd mode, then 2nd prgm, 2 and type 0,0,5,5.

    zoom62ndQUITmode2ndDRAWprgm20,0,5,5)enter
    After step 1: Press zoom, 6 for the standard window, go home with 2nd mode, then 2nd prgm, 2 and type 0,0,5,5.

  2. Go home to see that the command ran.

    2ndQUITmode
Result of the example "A diagonal line" The display shows: Line(0,0,5,5) / Done.
You should seeLine(0,0,5,5) Done

Use graph to return to the picture, and ClrDraw (DRAW item 1) to erase it.

23.3Draw a circle#

Circle(x,y,r) draws a circle with centre (x, y). Use ZSquare (zoom, 5) first so that it looks round.

Example 23.2

A circle of radius 3

  1. Set the window with ZSquare, go home, then 2nd prgm, 5 and type 0,0,3.

    zoom52ndQUITmode2ndDRAWprgm50,0,3)enter2ndQUITmode
Result of the example "A circle of radius 3" The display shows: Circle(0,0,3) / Done.
You should seeCircle(0,0,3) Done
The circle on the graph screen.
The circle on the graph screen.

23.4Horizontal and vertical lines and points#

Example 23.3

A vertical line at x = 2

  1. Press 2nd prgm, 4 (Vertical) and type 2.

    zoom62ndQUITmode2ndDRAWprgm42enter2ndQUITmode
Result of the example "A vertical line at x = 2" The display shows: Vertical 2 / Done.
You should seeVertical 2 Done
Example 23.4

Plot a point

  1. Press 2nd prgm, right, 1 (Pt-On() and type 3,3.

    zoom62ndQUITmode2ndDRAWprgm▶13,3)enter2ndQUITmode
Result of the example "Plot a point" The display shows: Pt-On(3,3) / Done.
You should seePt-On(3,3) Done

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