Adding fading Background color (green --> yellow --> red) to plot(x,y)

Question

Daniel Leibundgut 2022-3-24

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1679289-adding-fading-background-color-green-yellow-red-to-plot-x-y

评论： Mathieu NOE 2022-3-24

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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Answer 1

Mathieu NOE 2022-3-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1679289-adding-fading-background-color-green-yellow-red-to-plot-x-y#answer_925694

在 MATLAB Online 中打开

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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Mathieu NOE 2022-3-24

在 MATLAB Online 中打开

hello again Daniel

so first version gave this

I tried this second version

code :

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
%% version #1 
% 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
%% version #2 
p = patch([pos_yellow 2 1 1 pos_yellow],[pos_yellow 1 1 2 pos_yellow],[1 0.63 0.48],...
   'FaceVertexCData',[1 1 0; 1 0 0; 0 1 0; 1 0 0; 1 1 0],...
    'FaceColor','interp','EdgeColor','none','FaceAlpha',0.5); % light red
p = patch([pos_yellow 2 2 1 pos_yellow],[pos_yellow 1 2 2 pos_yellow],[1 0.63 0.48],...
   'FaceVertexCData',[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;