Class: SimpleFunctionGraphView

• Inheritance
• Description
• Instance protocol
  • accessing
  • change & update
  • drawing
• Examples

Inheritance:

   Object
   |
   +--GraphicsMedium
      |
      +--DisplaySurface
         |
         +--SimpleView
            |
            +--View
               |
               +--SimpleFunctionGraphView

Package:

stx:libwidg3

Category:

Views-Graphs

Version:

rev: 1.9 date: 2023/07/06 14:35:56

user: cg

file: SimpleFunctionGraphView.st directory: libwidg3

module: stx stc-classLibrary: libwidg3

Description:

A very quick and dirty (and simple) hack to
display a graph of a function.

TODO: grid & scale drawing.

copyright
COPYRIGHT (c) 1997 by eXept Software AG
             All Rights Reserved

This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice.   This software may not
be provided or otherwise made available to, or used by, any
other person.  No title to or ownership of the software is
hereby transferred.

Instance protocol:

 autoScaleHolder: aValueHolder

set the value of the instance variable 'minXHolder' (automatically generated)

 displayModeHolder

return the value of the instance variable 'displayModeHolder' (automatically generated)

 displayModeHolder: aValueHolder

set the value of the instance variable 'displayModeHolder' (automatically generated)

 function: aBlock

(comment from inherited method)
set the drawing function if it has changed.
The argument is one of:
#copy,#copyInverted,#xor,#and,#andReverse
#andInverted,#or,#orReverse,#orInverted
#invert,#clear,#set,#noop,#equiv,#nand
Notice: not all graphicMedia support all functions

 functionHolder

return the value of the instance variable 'functionHolder' (automatically generated)

 functionHolder: aValueHolder

set the value of the instance variable 'functionHolder' (automatically generated)

 graphColorHolder

return the value of the instance variable 'graphColorHolder' (automatically generated)

 graphColorHolder: aValueHolder

set the value of the instance variable 'graphColorHolder' (automatically generated)

 gridColorHolder

return the value of the instance variable 'gridColorHolder' (automatically generated)

 gridColorHolder: aValueHolder

set the value of the instance variable 'gridColorHolder' (automatically generated)

 invalidColorHolder

return the value of the instance variable 'invalidColorHolder' (automatically generated)

 invalidColorHolder: aValueHolder

set the value of the instance variable 'invalidColorHolder' (automatically generated)

 markInvalidHolder

return the value of the instance variable 'markInvalidHolder' (automatically generated)

 markInvalidHolder: aValueHolder

set the value of the instance variable 'markInvalidHolder' (automatically generated)

 maxXHolder

return the value of the instance variable 'maxXHolder' (automatically generated)

 maxXHolder: aValueHolder

set the value of the instance variable 'maxXHolder' (automatically generated)

 maxYHolder

return the value of the instance variable 'maxYHolder' (automatically generated)

 maxYHolder: aValueHolder

set the value of the instance variable 'maxYHolder' (automatically generated)

 minXHolder

return the value of the instance variable 'minXHolder' (automatically generated)

 minXHolder: aValueHolder

set the value of the instance variable 'minXHolder' (automatically generated)

 minYHolder

return the value of the instance variable 'minYHolder' (automatically generated)

 minYHolder: aValueHolder

set the value of the instance variable 'minYHolder' (automatically generated)

 showGridHolder

return the value of the instance variable 'showGridHolder' (automatically generated)

 showGridHolder: aValueHolder

set the value of the instance variable 'showGridHolder' (automatically generated)

 showUnitsXHolder

return the value of the instance variable 'showUnitsXHolder' (automatically generated)

 showUnitsXHolder: aValueHolder

set the value of the instance variable 'showUnitsXHolder' (automatically generated)

 showUnitsYHolder

return the value of the instance variable 'showUnitsYHolder' (automatically generated)

 showUnitsYHolder: aValueHolder

set the value of the instance variable 'showUnitsYHolder' (automatically generated)

 unitColorHolder

return the value of the instance variable 'unitColorHolder' (automatically generated)

 unitColorHolder: aValueHolder

set the value of the instance variable 'unitColorHolder' (automatically generated)

 sizeChanged: how from: oldExtentOrNil

my view has changed the size (not the contents)

 update: something with: someArgument from: changedObject

something changed - for now, do a full redraw

 chooseGrid

for every centimeter on the display ...

 computeGraph

compute the graph

 drawAxis

stepX := rangeX / nSteps.

 redrawX: x y: y width: w height: h

redraw the graph

 test: arg

redraw the graph

Usage example(s):

self basicNew test:nil

Examples:

        |top graphView|

        top := StandardSystemView extent:300@300.
        graphView := SimpleFunctionGraphView origin:0.0@0.0 corner:1.0@1.0 in:top.

        graphView minXHolder:(-5 asValue).
        graphView maxXHolder:(5 asValue).
        graphView minYHolder:(-2 asValue).
        graphView maxYHolder:(2 asValue).

        graphView function:[:x | x sin].

        top open.

        |top graphView|

        top := StandardSystemView extent:300@300.
        graphView := SimpleFunctionGraphView origin:0.0@0.0 corner:1.0@1.0 in:top.

        graphView graphColorHolder:(Color white).
        graphView backgroundColor:Color black.
        graphView minXHolder:(-5 asValue).
        graphView maxXHolder:(5 asValue).
        graphView minYHolder:(-2 asValue).
        graphView maxYHolder:(2 asValue).

        graphView function:[:x | x sin].

        top open.

        |top graphView minX maxX|

        top := StandardSystemView extent:300@300.
        graphView := SimpleFunctionGraphView origin:0.0@0.0 corner:1.0@1.0 in:top.

        graphView graphColorHolder:(Color white).
        graphView backgroundColor:Color black.
        graphView minXHolder:(minX := -5 asValue).
        graphView maxXHolder:(maxX := 5 asValue).
        graphView minYHolder:(-2 asValue).
        graphView maxYHolder:(2 asValue).

        graphView function:[:x | x sin].

        top openAndWaitUntilVisible.

        [
            [top realized] whileTrue:[
                Delay waitForSeconds:0.05.
                minX value:(minX value + 0.1).
                maxX value:(maxX value + 0.1).
            ]
        ] fork
                

        |top graphView functionList|

        functionList := OrderedCollection new.
        functionList add:[:x | x].
        functionList add:[:x | x * x].
        functionList add:[:x | x sqrt].
        functionList add:[:x | x sin].
        functionList add:[:x | x cos].
        functionList add:[:x | x tan].
        functionList add:[:x | x log].
        functionList add:[:x | x exp].
        functionList add:[:x | 0].

        top := StandardSystemView extent:300@300.
        graphView := SimpleFunctionGraphView origin:0.0@0.0 corner:1.0@1.0 in:top.

        graphView graphColorHolder:(Color white).
        graphView backgroundColor:Color black.
        graphView minXHolder:(-5 asValue).
        graphView maxXHolder:(5 asValue).
        graphView minYHolder:(-2 asValue).
        graphView maxYHolder:(2 asValue).
        graphView displayModeHolder:(#lineMode asValue).

        graphView function:(functionList last).

        top openAndWaitUntilVisible.

        [
            [top realized] whileTrue:[
                functionList do:[:funcBlock |
                    Delay waitForSeconds:1.
                    graphView displayModeHolder value:#dotMode.
                    Delay waitForSeconds:1.
                    graphView displayModeHolder value:#lineMode.
                    Delay waitForSeconds:1.
                    graphView displayModeHolder value:#dotMode.

                    Delay waitForSeconds:1.
                    graphView displayModeHolder value:#lineMode.
                    graphView functionHolder value:funcBlock.
                ]
            ]
        ] fork