Class: BarChartWidget

• Inheritance
• Description
• Instance protocol
  • accessing
  • accessing-color & font
  • change & update
  • drawing
  • event handling
  • hooks
  • initialization
  • private
  • views
• Examples

Inheritance:

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

Package:

stx:libwidg3

Category:

Views-Graphs

Version:

rev: 1.20 date: 2023/11/29 15:21:33

user: cg

file: BarChartWidget.st directory: libwidg3

module: stx stc-classLibrary: libwidg3

Description:

This is a demo widget programmed as a learning experience...

hallo erstmal...

a simple BarChart, 

The model is a collection of chart description items,
each being a dictionary filled with entries for:
    #value  aNumber         the numeric value
    #color  aColor          the color

see example on how to fill such a chartDescription model.



[instance variables:]
    minWidth        left Viewport limit 
    maxWidth        right Viewport limit
    maxHeight       top Viewport limit
    minHeight       bottom Viewport limit
    xAbstand        difference between vertical lines
    yMaxScale       limit of horizontal value
    anzahl          number of values
    summe           summe of all values
    maxWert         biggest value
    schrumpf        factor of ...
    aod             Aray of Dictionaries
    foregroundColor color for label
    backgroundColor color for background lines
    label1          name of bar chart
    style           fontstyle
    newfont 
    oldfont

copyright
COPYRIGHT (c) 1998 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:

 anzahl

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

 anzahl: something

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

 aod

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

 aod: something

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

 barChartName

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

 barChartName: something

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

 label

(comment from inherited method)
return the view's label - this is nil here

 label: aString

(comment from inherited method)
set the view's label.
Ignored here.

 maxHeight

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

 maxHeight: something

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

 maxWert

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

 maxWert: something

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

 maxWidth

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

 maxWidth: something

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

 minHeight

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

 minHeight: something

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

 minWidth

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

 minWidth: something

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

 model: newModel

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

 newfont

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

 newfont: something

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

 oldfont

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

 oldfont: something

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

 schrumpf

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

 schrumpf: something

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

 style

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

 style: something

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

 summe

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

 summe: something

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

 xAbstand

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

 xAbstand: something

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

 yMaxScale

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

 yMaxScale: something

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

 backgroundColor

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

 backgroundColor: something

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

 foregroundColor

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

 foregroundColor: something

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

 update: something with: aParameter from: changedObject

 drawBarBars

draw some filled rectangle as like bars in a barChart.

 drawBarChart

get number of bars

 drawBarScale

xAbstand is a instanzVariable

 drawBarScale2

xAbstand is a instanzVariable

 drawLogo

put demo values into model

 redrawBarChart

Instanzvariablen initialisieren

 writeLabel

 redrawX: x y: y width: w height: h

(comment from inherited method)
redraw part of myself immediately, given logical coordinates
(if transformation is nonNil)
The default here is to redraw everything
- subclasses usually redefine this, adding more intelligence

 sizeChanged: how from: oldExtentOrNil

my view has changed the size (not the contents)

 postBuildWith: aBuilder

automatically generated by UIPainter ...

Usage example(s):

super postBuildWith:aBuilder

 initialize

initialisierung und sein Kind

 getAnzahl

ermittelt die Anzahl der belegten Diagrammstücke

 getMaxWert

initialisiert die Instanzvariable maxWert mit dem größten Wert

 getSumme

initialisiert die Instanzvariable summe mit der Gesamtsumme

 standardColors

 valuesDo: aBlock

 getBarChartWidget

Examples:

        |p chart bars holder|

        chart := OrderedCollection new.
        bars := Dictionary new.
        bars at:#value put:50.
        bars at:#color put:Color red.
        chart add:bars.

        bars := Dictionary new.
        bars at:#value put:100.
        bars at:#color put:Color blue.
        chart add:bars.

        p := BarChartWidget new.
        p model:(holder := ValueHolder new).
        p extent:400@250.
        p label:'demo BarChart'.
        p open.
        holder value:chart.
        Delay waitForSeconds:2.

        1 to: 5 do:[:i |
            bars := Dictionary new.
            bars at:#value put:30.

            bars at:#color put:(i odd ifTrue:[Color green] 
                                       ifFalse:[Color magenta]).
            chart add:bars.

            holder value:nil.
            holder value:chart.
        ]