Re: [Scilab-users] How to create transparent polygon

[jaipur]

Thank you all.

I understand that scilab has the ability to draw transparent polygon any
way.
But changing of pixel_drawing_mode property affect already existent way of
drawing, we have to be careful when doing.
Especially when changing of pixel_drawing_mode property two or more times.

Thank you.

H.T.



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Re: [Scilab-users] How to create transparent polygon

[Chin Luh Tan]

the previous method is the implementation as suggested by Samuel, another 
approach would be using Matplot.



you could play with the last line obj1 and obj2 (alpha blending) to get the 
desired intersection color. 


x = zeros(100,100,3);

obj1 = x;
obj2 = x;

obj1(21:60,21:60) = 1;
obj1(:,:,2:3) = 0;

obj2(41:80,41:80,2) = 1;
obj2(:,:,[1,3]) = 0;

Matplot(obj1+obj2)







 On Tue, 12 Nov 2019 11:39:38 +0800 Chin Luh Tan 
 wrote 


Hi,

If it is not necessary to have real transparent color mixing, but just want to 
have the transparent effect, you could try to play with the 
"pixel_drawing_mode". 
f = figure("background", 1,"pixel_drawing_mode", "or");
plot2d(0,0,-1,"010"," ",[-2,-2,2,2]);

x=sin(2*%pi*(0:4)/5);
y=cos(2*%pi*(0:4)/5);
plot2d(0,0,-1,"010"," ",[-2,-2,2,2]);
gca().foreground = 12;
xfpoly(x,y);
gca().foreground = 27;
xfpoly(x+0.3,y+0.3)






example from https://help.scilab.org/docs/6.0.2/en_US/pixel_drawing_mode.html

rgds,
CL


 On Sat, 09 Nov 2019 21:19:44 +0800 jaipur  wrote 











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Dear all 
 
When making a polygon by xpoly for example, can we set transparency effect 
as the following polygon? 
If it's possible, could you suggest the way of doing? 
 
Regards 
Hiroshi Tachihara 
 
 
 
 
 
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Re: [Scilab-users] How to create transparent polygon

[Chin Luh Tan]

Hi,

If it is not necessary to have real transparent color mixing, but just want to 
have the transparent effect, you could try to play with the 
"pixel_drawing_mode". 
f = figure("background", 1,"pixel_drawing_mode", "or");
plot2d(0,0,-1,"010"," ",[-2,-2,2,2]);

x=sin(2*%pi*(0:4)/5);
y=cos(2*%pi*(0:4)/5);
plot2d(0,0,-1,"010"," ",[-2,-2,2,2]);
gca().foreground = 12;
xfpoly(x,y);
gca().foreground = 27;
xfpoly(x+0.3,y+0.3)






example from https://help.scilab.org/docs/6.0.2/en_US/pixel_drawing_mode.html

rgds,
CL


 On Sat, 09 Nov 2019 21:19:44 +0800 jaipur  wrote 



Dear all 
 
When making a polygon by xpoly for example, can we set transparency effect 
as the following polygon? 
If it's possible, could you suggest the way of doing? 
 
Regards 
Hiroshi Tachihara 
 
 
 
 
 
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Re: [Scilab-users] How to create transparent polygon

[Samuel Gougeon]

Le 09/11/2019 à 14:19, jaipur a écrit :

Dear all

When making a polygon by xpoly for example, can we set transparency effect
as the following polygon?

No, AFAIK it is not properly possible.
There is just the *gcf().**pixel_drawing_mode property*, but it's a 
global one for the whole figure,

and it is not easy to manage. This way is rather a hack.
help.scilab.org/docs/6.0.2/en_US/pixel_drawing_mode.html



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[Scilab-users] How to create transparent polygon

[jaipur]

Dear all

When making a polygon by xpoly for example, can we set transparency effect
as the following polygon?
If it's possible, could you suggest the way of doing?

Regards
Hiroshi Tachihara

 



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