Solved

how to create a brush with a transparent bitmap

Posted on 1997-11-20
5
667 Views
Last Modified: 2013-12-03
I need to fill polygons with a certain pattern and a certain color. This is most easilly done with a patterned brush.
However the pattern must be transparent.( it must consist of one transparent part an one coloured part) It must work just  like a mask, but a mask only works on other bit arrays. What i need is more like another predefined hatchbrush.
These will work with any color, but i need a lot more patterns.  

It is possible to create a brush with CreatePatternBrush() (windows API), but with this method the background is affected.(NOT transparent)

In short: I need a way to create a brush with any pattern(not the predefined rubbish) and any color that must be partially transparent.

It must be a solution that will work with windows API calls only, not with OWL or something like that.
0
Comment
Question by:molli500
5 Comments
 

Author Comment

by:molli500
ID: 1408639
Edited text of question
0
 
LVL 15

Expert Comment

by:Tommy Hui
ID: 1408640
There isn't anything in Windows that knows about transparencies other than cursors and icons. You will need to write the code yourself if you want transparent brushes.
0
 
LVL 10

Expert Comment

by:RONSLOW
ID: 1408641
Masks and bitmap operations are the best way to achieve this.

0
 

Author Comment

by:molli500
ID: 1408642
Masks and bitmap operations don't work with the predefined draw functions. That is why I need a brush. I can very probably program my way around this by using masks and such, but thta is what i am trying to avoid. One answer suggested this, but that wasn't the question. What I need is a brush that will not affect the background except where its pattern is. It should be possible to use any colour for any pattern.
0
 

Accepted Solution

by:
Sprocket earned 350 total points
ID: 1408643
HDC hdc = GetDC(m_hWnd);

if (hdc)
{
long x=0, y=0, width=0, height=0;
            
            if (m_HorzDrag.size())
            {
                  HBRUSH hOld = (HBRUSH)SelectObject(hdc, m_hBrush);

                  x = m_recHDrag.left;
                  y = m_recHDrag.top;
                  width  = m_recHDrag.right -x;
                  height = m_recHDrag.bottom-y;

                  PatBlt(hdc, x, y, width, height, PATINVERT);
                  SelectObject(hdc, hOld);
            }
            if (m_VertDrag.size())
            {
                  HBRUSH hOld = (HBRUSH)SelectObject(hdc, m_hBrush);

                  x = m_recVDrag.left;
                  y = m_recVDrag.top;
                  width  = m_recVDrag.right -x;
                  height = m_recVDrag.bottom-y;

                  PatBlt(hdc, x, y, width, height, PATINVERT);
                  SelectObject(hdc, hOld);
            }

            ReleaseDC(m_hWnd, hdc);
      }
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

This article describes how to programmatically preset the "Pages per Sheet" option that's available with most printer drivers.   This setting lets you do "n-Up" printing, where two, four, or more pages are printed on each sheet of paper. If your …
A theme is a collection of property settings that allow you to define the look of pages and controls, and then apply the look consistently across pages in an application. Themes can be made up of a set of elements: skins, style sheets, images, and o…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

829 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