What is the correct way to draw transparent text on a DC

Question

0.00/5 (No votes)

See more:

I am drawing a text string with a transparent background using CDC::SetBkMode(TRANSPARENT) and CDC::DrawText().

This works fine but if the text changes, I (obviously) end up with a mess on the screen as each time I draw the string, it is on top of the previous one.

What is the preferred method to erase the background before drawing the string?

What I have tried:

I have tried calling InvalidateRect() and UpdateWindow() to erase the background. I have also tried capturing the background to a bitmap and re-drawing it before drawing the text on top.

Both methods work but I would like to know if there is a better way.

Posted 17-Sep-19 20:04pm

softwaremonkey

Updated 18-Sep-19 15:50pm

Add a Solution

1 solution

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Rick York · Accepted Answer · 2019-09-18T15:50:00

Solution 1

InvalidateRect is the appropriate method. You probably have to pass it true to cause the background to be redrawn since the text is transparent.

Posted 18-Sep-19 15:50pm

Rick York

What is the correct way to draw transparent text on a DC

1 solution

Solution 1

Add your solution here

Preview 0

What is the correct way to draw transparent text on a DC

1 solution

Solution 1

Add your solution here

Preview 0

Existing Members

...or Join us