Thread: HOW TO CREATE A PIECHART

Originally Posted by s1mon1980

I need help in a project in davhid schmidt book . Here's the task :
Here is the application that does this; test your coding of class PieChartWriter with it.

Please help me as soon as you can.

Personally, I don't have that book ... and I don't know what is the PieChartWriter.
So, what's your problem/question?

Originally Posted by s1mon1980

PieChartWriter is the class that I should make . My question is how to start with this i have made few piecharts but not close with this one so i need to know how someone tell me a part of it.

Obviously, I know what is a "pie chart". The question is: do you need to generate an image file (e.g. png)? Or do you need to show the pie chart in a window? Or other?

Originally Posted by s1mon1980

I have to show it in a window .

Ok, and how much do you know about Swing, components and custom painting?
And are you sure that your PieChartWriter should have methods like setSlice1, setSlice2 etc..? In other words with the pie number "cabled" in the method name? So how many parts you want to have? fixed to 4? Potentially any number?

Originally Posted by s1mon1980

Here's the photo on how should it look:
View image: Capture

Ok, now the graphics appearance is clear. What are your further problems/questions? Are you able to create a JFrame that contains a panel in which you draw, for example, an initial circle?
I can't support you all the day every ten minutes, continuing to ask you things .... you should have some basics, if not, please start at Creating a GUI With JFC/Swing.
Then ask for specific problems/questions whenever is necessary.

Originally Posted by s1mon1980

I just don't know how to create setSlice methods with three parameters within it(like testchart above) , other part is clear now thank you.

Before other things, you should understand (and eventually clarify here) what is the role of PieChartWriter class.

I can think two possibilities:

a) PieChartWriter is a simple "bean" class, that contains only those informations (with fields for datas and any necessary getter/setter method), and nothing else about graphical aspects. In this sense, PieChartWriter should be named as PieChart since it doesn't "write" anything. Then an instance of PieChart can be passed to a component to display those informations.

or

b) PieChartWriter is the panel that shows the pie chart. It still contains those informations (using fields, etc...) but the class also "knows" how to paint the chart into the panel.