Hi,
A number of forum posts and the online help mention that you can specify the alpha value for colors to make them transparent (or semi-transparent). They say just to enter a 4th number after the RGB values.
This does not always seem to work when entering the values into the properties of the RadChart control. For example if I enter "255,128,0,128" into the Appearance/FillStyle/MainColor it gets changed to "Purple" i.e. 128,0,128. It has stripped out the first number in the quartet. Whenever the Red value is 255 then it strips that value out.
Also the color swatch next to the values does not display the color correctly if there is an alpha value in there. e.g. If you enter "0,0,255,128" it should show half transparent blue. But ti shows white. Even entering "0,0,255,0" does not show blue.
Clayton.
A number of forum posts and the online help mention that you can specify the alpha value for colors to make them transparent (or semi-transparent). They say just to enter a 4th number after the RGB values.
This does not always seem to work when entering the values into the properties of the RadChart control. For example if I enter "255,128,0,128" into the Appearance/FillStyle/MainColor it gets changed to "Purple" i.e. 128,0,128. It has stripped out the first number in the quartet. Whenever the Red value is 255 then it strips that value out.
Also the color swatch next to the values does not display the color correctly if there is an alpha value in there. e.g. If you enter "0,0,255,128" it should show half transparent blue. But ti shows white. Even entering "0,0,255,0" does not show blue.
Clayton.
3 Answers, 1 is accepted
0
Accepted
Hi Clayton,
Actually, the alpha value is the first number, not the fourth one.
Is it OK now?
All the best,
Dimo
the Telerik team
Instantly find answers to your questions at the new Telerik Support Center
Actually, the alpha value is the first number, not the fourth one.
Is it OK now?
All the best,
Dimo
the Telerik team
Instantly find answers to your questions at the new Telerik Support Center
0
skysailor
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answered on 12 Mar 2008, 10:39 PM
Hi,
Thanks for that - my mistake.
However there seems to be some confusion in your documentation. I'm looking at the current Prometheus documentation for RadChart.
The section called "Setting The Background" under "Styling RadCharts" mentions Opacity and the greater the opacity value the less transparent it is. And then it shows the first value as transparency level 0-255. Is the number the transparency or the opacity? Is 0 fully transparent or fully opaque?
The section called "How do I make colors display with partial transparency" in the "How To" section says the first value is the transparency value as a percentage! It says that 80 means 80% transparent.
So now I'm a little confused...
Clayton.
Thanks for that - my mistake.
However there seems to be some confusion in your documentation. I'm looking at the current Prometheus documentation for RadChart.
The section called "Setting The Background" under "Styling RadCharts" mentions Opacity and the greater the opacity value the less transparent it is. And then it shows the first value as transparency level 0-255. Is the number the transparency or the opacity? Is 0 fully transparent or fully opaque?
The section called "How do I make colors display with partial transparency" in the "How To" section says the first value is the transparency value as a percentage! It says that 80 means 80% transparent.
So now I'm a little confused...
Clayton.
0
Hello Clayton,
The greater the value is, the less transparent the image becomes. That is -- 0 is fully transparent. As for the How-to help topic -- It seems we have made a mistake there - it is not 80% transparent, but the alpha channel has a value of 80, that is nearly two thirds transparent.
We will make sure this help topic is corrected. Your Telerik points have been updated.
Greetings,
Ves
the Telerik team
Instantly find answers to your questions at the new Telerik Support Center
The greater the value is, the less transparent the image becomes. That is -- 0 is fully transparent. As for the How-to help topic -- It seems we have made a mistake there - it is not 80% transparent, but the alpha channel has a value of 80, that is nearly two thirds transparent.
We will make sure this help topic is corrected. Your Telerik points have been updated.
Greetings,
Ves
the Telerik team
Instantly find answers to your questions at the new Telerik Support Center