How can I make them the same color even when overlapping?
I want to use transparent to some degree.
Plot[{1 + x, 2 - x}, {x, 0, 1},
PlotStyle ->
Directive[Red, Thickness[0.03], Opacity[0.3], CapForm["Round"]]]
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2 Answers
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How can I make them the same color even when overlapping?
One possibility?
p1 = Plot[1 + x, {x, 0, 1}, PlotStyle ->
Directive[Red, Thickness[0.03], Opacity[0.3], CapForm["Round"]]];
p2 = Plot[2 - x, {x, 0, 1}, PlotStyle ->
Directive[Red, Thickness[0.03], Opacity[0.3], CapForm["Round"]]];
ImageCompose[Rasterize[p1],
ColorReplace[Rasterize[p2], White -> Transparent]]
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$\begingroup$ I think I didn't say it clearly. I actually want Opacity for the lines not the background. $\endgroup$– hanaCommented Aug 16, 2022 at 16:06
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You can use a simplified function to mimic alpha blending:
alphaBlend[rgb_RGBColor, alpha_, back_ : White] := Blend[{rgb, back}, 1 - alpha]
Plot[{1 + x, 2 - x}, {x, 0, 1},
PlotStyle ->
Directive[alphaBlend[Red, 0.3], Thickness[0.03],
CapForm["Round"]]]
You can also account for the background color
Plot[{1 + x, 2 - x}, {x, 0, 1},
PlotStyle ->
Directive[alphaBlend[Red, 0.3, LightBlue], Thickness[0.03],
CapForm["Round"]], Background -> LightBlue]
(On preview this is basically what @kglr is saying)
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$\begingroup$ But this is not transparent, like Opacity[0.3]. I think I didn't say it clearly. I actually want Opacity for the lines not the background. $\endgroup$– hanaCommented Aug 16, 2022 at 16:01
PlotStyle -> Directive[Blend[{Red, White}, .7], Thickness[0.03], CapForm["Round"]]? $\endgroup$