Adding fading Background color (green --> yellow --> red) to plot(x,y)
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Daniel Leibundgut
le 24 Mar 2022
Commenté : Mathieu NOE
le 24 Mar 2022
I would like to add a fading colors into the backoground when using plot(x,y).
starting with green at 1.0 and below, fading to yellow (1.2) and yellow fading to red (1.8 and higher). This color schema shall be appllied in both directions x and y.
The following code does only color fading from green to red but noth using yellow:
xdata = [1.378 1.398 1.467 1.558 1.393 1.277 1.775 1.327];
ydata = [1.350 1.660 1.477 1.615 1.471 1.350 1.959 1.400];
figure(11); clf;
plot(xdata,ydata,'o'); grid;
axis square;
axis([1 2 1 2]);
% only two colors green --> red
hold on;
p = patch([1.00 2.00 2.00 1.00],[1.00 1.00 2.00 2.00],...
[1 0.63 0.48],'FaceVertexCData',[0 1 0; 1 0 0; 1 0 0; 1 0 0],...
'FaceColor','interp','EdgeColor','none','FaceAlpha',0.5); % light red
hold off;
Thank you for your help!
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Mathieu NOE
le 24 Mar 2022
hello daniel
try this and tune the pos_yellow parameter to get exactly the visual aspect yu want
xdata = [1.378 1.398 1.467 1.558 1.393 1.277 1.775 1.327];
ydata = [1.350 1.660 1.477 1.615 1.471 1.350 1.959 1.400];
figure(11); clf;
plot(xdata,ydata,'o'); grid;
axis square;
axis([1 2 1 2]);
% 3 colors green --> yellow --> red
hold on;
pos_yellow = 1.4; % try between 1.2 and 1.5 to match visually your expectations
p = patch([1 pos_yellow 2 2 1 1],[1 1 1 2 2 pos_yellow],[1 0.63 0.48],...
'FaceVertexCData',[0 1 0; 1 1 0; 1 0 0; 1 0 0; 1 0 0; 1 1 0],...
'FaceColor','interp','EdgeColor','none','FaceAlpha',0.5); % light red
hold off;
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Plus de réponses (1)
Chunru
le 24 Mar 2022
xdata = [1.378 1.398 1.467 1.558 1.393 1.277 1.775 1.327];
ydata = [1.350 1.660 1.477 1.615 1.471 1.350 1.959 1.400];
figure(11); clf;
plot(xdata,ydata,'o'); grid;
axis square;
axis([1 2 1 2]);
% only two colors green --> red
hold on;
% Adjust the vertex color
% [0 1 0; 1 0 0; 1 1 0; 1 0 0] => G R Y R for the 4 corners
p = patch([1.00 2.00 2.00 1.00],[1.00 1.00 2.00 2.00],...
[1 0.63 0.48],'FaceVertexCData',[0 1 0; 1 0 0; 1 1 0; 1 0 0],...
'FaceColor','interp','EdgeColor','none','FaceAlpha',0.5); % light red
hold off;
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