Use colormap to color axis?

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Roger Breton
Roger Breton 2022-1-16
评论： Walter Roberson 2022-1-17
From reading the documentation, it seems axes colors can only be 'uniform'.
Would there be a way to apply a colormap to an axes color property?
  2 个评论
Roger Breton
Roger Breton 2022-1-16
Seems all I can possibly control is through the X, Y and ZColor :
set(ax, {'XColor', 'YColor', 'ZColor'}....
The default is [0.15 0.15 0.15] RGB triplet.
I don't see any 'colormap' option here... unless there is a hack? I'm about to throw the towel :(
Image Analyst
Image Analyst 2022-1-16
Why throw in the towel? Didn't my answer below do what you want?

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回答（1 个）

Image Analyst
Image Analyst 2022-1-16
I think you'd have to use line() to draw colored line segments along the x axis:
plot(1 : 10, 'b.-', 'LineWidth', 2, 'MarkerSize', 30);
xl = xlim()
yl = ylim()
xs = linspace(xl(1), xl(2), 200);
hold on;
colorList = turbo(length(xs));
xAxisWidth = 4;
for k = 1 : length(xs)
thisColor = colorList(k, :);
line([xs(k), xl(end)], [0, 0], 'Color', thisColor, 'LineWidth', xAxisWidth)
end
hold off;
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Roger Breton
Roger Breton 2022-1-17
I have no idea where to go look for the reply, Walter.
Meanwhile, I analyse Image Analyst code. This is one of the most interesting and powerful feature of Matlab, to be able to step through the script one line at a time and to be able to inspect every value :
plot(1 : 10, 'b.-', 'LineWidth', 2, 'MarkerSize', 30);
xl = xlim();
yl = ylim();
% y = linspace(x1,x2,n) generates n points. The spacing between the points is (x2-x1)/(n-1)
% xs = linspace(xl(1), xl(2), 200);
% xs = linspace(xl(1), xl(2), 10);
xs = linspace(1, 10, 10);
hold on;
% turbo = colormap array
% colorList = turbo(length(xs)); % 10 Rangées x 3 double, RGB
colorList = winter(length(xs));
% j = colorList(1, :)
% colorList = [0.3 0.9 0.1]
xAxisWidth = 50;
% First coordinate, specified as a vector or a matrix.
% the first coordinate is x-axis position in data units
% the second coordinate is y-axis position in data units
% color = double RGB triplet
% line([xs(1), xl(end)], [0, 0], 'Color', colorList(1, :), 'LineWidth', xAxisWidth)
% line([1, 10], [0, 0], 'Color', colorList(1, :), 'LineWidth', xAxisWidth)
for k = 1 : length(xs)
fprintf('Itération = %i \n',k);
fprintf('ColorList = R%4.2f G%4.2f B%4.2f \n', colorList(k, 1), colorList(k, 2), colorList(k, 3))
thisColor = colorList(k, :);
fprintf('Line Origin (xs(k) x1(end)) = [%i, %i] \n', xs(k), xl(end));
fprintf('thisColor = [R%4.2f G%4.2f B%4.2f] \n', thisColor(1), thisColor(2), thisColor(3));
line([xs(k), xl(end)], [0, 0], 'Color', thisColor, 'LineWidth', xAxisWidth)
end
hold off;
I think it's a good idea. Trouble is to come up with the custom colormap in the first place... My next target for study. Thank you for all your help.

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