about contour and transparent

Hi,

     I am trying to plot coutour overlaying on the top of imagesc. But my result is contour blocking the imagesc. I tried to make countour transparency.

     So, please show me how to make countour transparency.

     Thanks.

Answer 1

[Walter Roberson]

thick = 0.8;   %alpha value
ch = contourf(...);
patches = findobj(ch,'-property','AlphaData')
for ph = patches
 set(ph,'AlphaData', thick * get(ph,'AlphaData'));
end

[Dawn]

Thank you.

My codes are: two dataset- d ,d1

imagesc(d); % plot figure

hold on;

thick = 0.8; %alpha value

ch =contour(d1,'black'); % overlay a transparent contour over imagesc

patches = findobj(ch,'-property','AlphaData');

for ph = patches

set(ph,'AlphaData', thick * get(ph,'AlphaData'));

end

Aftr running the codes, error message is:

Invalid handle

Error in ==> contourplot at 5

patches = findobj(ch,'-property','AlphaData');

[Dawn]

Thank you.

My codes are: two dataset- d ,d1

imagesc(d); % plot figure

hold on;

thick = 0.8; %alpha value

ch =contour(d1,'black'); % overlay a transparent contour over imagesc

patches = findobj(ch,'-property','AlphaData');

for ph = patches

set(ph,'AlphaData', thick * get(ph,'AlphaData'));

end

Aftr running the codes, error message is:

Invalid handle

Error in ==> contourplot at 5

patches = findobj(ch,'-property','AlphaData');

Answer 2

[Jaime Calle]

Once you have the handle to contour plot (ch), look for 'FaceAlpha' property in the contour plot children.

Patches = findobj(ch,'-property','FaceAlpha');

Then you can set transparency value to those patches by means of:

set(Patches, 'FaceAlpha', thick)

For patches and surfaces, the object property is 'FaceAlpha':