Overlaying gradient patches in single plot.

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Eric
Eric 2021-5-29
评论： darova 2021-6-5
I have created two gradient patches: the colormap for one goes from red to white (i.e., [1,0,0] --> [1, 1, 1]) over the range [1000,1600] along the x-axis of a subplot, while the other colormap goes from white to blue (i.e., [1, 1, 1] --> [0, 0, 1]/) over the range [1400, 2000] along the x-axis of a second subplot. xlim for both suplots is [1000, 2000], and I use a for loop with 256 iterations to create the colormaps. Is there any way to superimpose the two patches in one x-y plot (adjusting transparency so that both gradients are visible where the colored portions of the two patches overlap (i.e., x = 1400 --> 1600)? Thanks in advance.
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Eric
Eric 2021-6-1
function varargout = Tamb_vs_Altitude_gradient()
clc; close all;
x_lo = [1000 ; 1000; 1600; 1600]; % x-limits for RED gradient
x_hi = [1400 ; 1400; 2000; 2000]; % x-limits for BLUE gradient
y = [0; 500; 500; 0]; % y-limits for BOTH gradients
c = [0; 0; 1; 1];
num_steps = 256;
for cm = 1:num_steps % Create the colormaps
Ag_colormap_lo(cm,:) = [255, 0 + cm*(255-0)/num_steps, 0 + cm*(255-0)/num_steps]/255;
Ag_colormap_hi(cm,:) = [255 - cm*(255-0)/num_steps, 255 - cm*(255-0)/num_steps, 255]/255;
end
save('Tamb_gradient_colormap.mat','Ag_colormap_lo','Ag_colormap_hi');
figure();
ax(1) = subplot(2,1,1); % Plot the RED gradient
p_lo = patch(x_lo,y,c);
set(p_lo,'FaceAlpha',1) % Adjust transparency of RED gradient
shading interp;
colorbar;
xlim([1000 2000]); ylim([0 500]);
ax(2) = subplot(2,1,2); % Plot the BLUE gradient
p_hi = patch(x_hi,y,c);
set(p_hi,'FaceAlpha',1) % Adjust transparency of BLUE gradient
shading interp;
colorbar;
xlim([1000 2000]); ylim([0 500]);
colormap(ax(1),Ag_colormap_lo); % Assign RED colormap to RED gradient
colormap(ax(2),Ag_colormap_hi); % Assign BLUE colormap to BLUE gradient
end
%%
Eric
Eric 2021-6-1
Here're the gradients I wish to superimpose on the one axis.

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darova
darova 2021-6-5
编辑：darova 2021-6-5
Ran in:
See this
% x_lo = [1000 ; 1000; 1600; 1600]; % x-limits for RED gradient
% x_hi = [1400 ; 1400; 2000; 2000]; % x-limits for BLUE gradient
% y = [0; 500; 500; 0]; % y-limits for BOTH gradients
num_steps = 10;
x = [linspace(1000,1400,num_steps) linspace(1600,2000,num_steps)]; % x coord
X = [x;x]; % the same top and bottom
Y = [0*x;0*x+500]; % Y coord
c = linspace(0,1,num_steps); % color interpolatioon
red = interp1([0 1],[1 0 0;1 1 1],c); % create red chanel
blu = interp1([0 1],[1 1 1;0 0 1],c); % create blue chanel
C = reshape([red;blu],1,[],3); % 3D matrix of colors
C = [C;C]; % the same top and bottom
surf(X,Y,X*0,C)
view(0,90)
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Eric
Eric 2021-6-5
Hello, Darova -
That's good stuff, but not quite what I was hoping would be possible, which would be the two gradients overlapping in the range of x = [1400 1600], producing a 'zone' that would go from red (RGB = [255, 0, 0] near 1400) to blue (RGB = [0, 0, 255] near 1600), and progressing from red through various shades of violet in between.
However, THANKS TO YOUR ANSWER, I learned enough to be able to produce exactly what I wanted. Couldn't have done it without your help. A gazillion thanks to you!!!
Eric

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