BackgroundColor limits white drawing color

AVT · 2017-07-18T18:21:15+00:00

Graphical instructions together with BackgroundColor have a funny limit: No matter what BG color you set, lines and text on that background are limited to a very bright gray but can not be white. This is what I found: at least two of the color values must be not higher than 235 (then the third color can have 255). Bug? Code for Tests: BACKGROUNDCOLOR(0,0,0) // color unimportant R=235 // 1st 235 G=235 // 2nd 235 B=255 // last can have 255 DrawText("■",barindex,0,Monospaced,Bold,16) coloured(R,G,B) Return

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07/18/2017 at 7:21 PM #41028 quote
AVT
Participant

Senior
Graphical instructions together with BackgroundColor have a funny limit: No matter what BG color you set, lines and text on that background are limited to a very bright gray but can not be white. This is what I found: at least two of the color values must be not higher than 235 (then the third color can have 255). Bug?

Code for Tests:
```
BACKGROUNDCOLOR(0,0,0) // color unimportant
R=235  // 1st 235
G=235  // 2nd 235
B=255  // last can have 255
DrawText("■",barindex,0,Monospaced,Bold,16) coloured(R,G,B)
Return
```
07/19/2017 at 9:20 AM #41048 quote

Nicolas
Keymaster

Legend

That’s not a bug, this is intentional, it is not possible to set a color brighter or darker than the actual background color. It was already the case with the color panel in the indicator setting, setting a dark gray color when you have a very dark background reverse the color to a brighter one. I know this is annoying when you want to plot something almost transparent… already discussed with IT finance team, I just add this query to my own wish list into the dedicated thread: https://www.prorealcode.com/topic/centralization-of-queries-and-suggestions-on-prorealtime/page/8/#post-41047

AVT and Bel thanked this post

07/19/2017 at 1:10 PM #41075 quote

AVT
Participant

Senior

I tried automatic inverting the colors when a user changes the background color. But here I am really lost, how a general formula should look like which works around these limits. Well for now it’s just one line and found a simple solution. (And for transparency we have the Alpha value now, great to use).

Thanks Nicolas.

07/19/2017 at 1:44 PM #41081 quote

Nicolas
Keymaster

Legend

Stop me if I’m wrong but the transparency will not help in this case: even if you make a line fully transparent with Alpha value it will not render as invisible?

07/20/2017 at 11:52 AM #41150 quote
AVT
Participant

Senior
Yes, you can completely fade out color. Example here:

Background black, Text color white (well not really completely bright white, but as far as we can go) and then fading out with Alpha. Code:
```
BACKGROUNDCOLOR(0,0,0) // color unimportant
R=235  // 1st 235
G=235  // 2nd 235
B=255  // last can have 255

Fade0=255  // bright
Fade1=128  // bit less
Fade2=64   // more less
Fade3=32   // even more less
Fade4=0    // invisible

DrawText("■",barindex,0.4,Monospaced,Bold,30) coloured(R,G,B,Fade0)
DrawText("■",barindex,0.2,Monospaced,Bold,30) coloured(R,G,B,Fade1)
DrawText("■",barindex,0,Monospaced,Bold,30) coloured(R,G,B,Fade2)
DrawText("■",barindex,-0.2,Monospaced,Bold,30) coloured(R,G,B,Fade3)
DrawText("■",barindex,-0.4,Monospaced,Bold,30) coloured(R,G,B,Fade4)
Return
```
Nicolas and AlgoAlex thanked this post

FadeOutExample.png
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BackgroundColor limits white drawing color

ProBuilder: Indicators & Custom Tools

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AVT @avt Participant

Summary

This topic contains 4 replies,
has 2 voices, and was last updated by AVT
9 years, 2 months ago.

Topic Details

Forum:	ProBuilder: Indicators & Custom Tools
Language:	English
Started:	07/18/2017
Status:	Active
Attachments:	1 files