Solved

Dashed lines

Posted on 1997-09-01
2
308 Views
Last Modified: 2010-04-04
How can I set the color of the 'gaps' in a dashed line?

I have a component ('chart') which draws lines on its canvas, it is over a form ('desktop') with a black panel on it. The dashed lines show silver gaps (from the silver form?) instead of transparent or black gaps to match the black panel that forms the background for the lines.
      Chart := TChartPlot.create(DeskTop);
      Chart.parent := DeskTop.BlackPanel;
If I can't get it to work correctly, then if I can just set the color of the gaps to black I'll be happy!

Thanks,
Frog.
0
Comment
Question by:frog
2 Comments
 
LVL 1

Accepted Solution

by:
arh earned 100 total points
ID: 1343335
Use windows API calls: SetBkMode or SetBkColor.
Here is an example (i tested it on a simple form with one
button):

procedure TForm1.Button1Click(Sender: TObject);
begin
  canvas.pen.style:=psDash;
  canvas.pen.color:=clYellow;
  canvas.pen.width:=1;
{ sets 'gap' color to red }
  setbkcolor(canvas.handle, clRed );
  canvas.moveto( 0, height );
  canvas.lineto( width, 0 );
{ sets 'gap' color to transparent }
  setbkmode( canvas.handle, transparent );
  canvas.moveto( 0, 0 );
  canvas.lineto( width, height );
end;

0
 

Author Comment

by:frog
ID: 1343336
As usual it's all in the help, just a matter of finding it.

Thanks for your help.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Delphi XE2 application frozen on Windows 10 10 277
select query - oracle 16 95
Delphi...Split view - idea? 1 42
How to load 2 images in same column in Delphi 2 34
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
In this video I am going to show you how to back up and restore Office 365 mailboxes using CodeTwo Backup for Office 365. Learn more about the tool used in this video here: http://www.codetwo.com/backup-for-office-365/ (http://www.codetwo.com/ba…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now