mantao/Gnuplot.jl
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Giorgio Calderone 2020-03-30 14:36:03 +02:00
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11
docs/src/advanced.md
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@ -15,6 +15,17 @@ fxy = [fz(x,y) for x in x, y in y]
@gsp :- 2 x y fxy "w pm3d notit"
```
```julia
img = testimage("earth_apollo17");
@gp "set multiplot layout 2,2 tit 'rotate keyword (positive direction is counter-clockwise)'" :-
@gp :- "set size square" "set autoscale fix" "unset tics" "\$img"=>(img,) :-
@gp :- 1 tit="Original" "plot \$img with rgbimage notit" :-
@gp :- 2 tit="rotate=-90 deg" "plot \$img rotate=-90deg with rgbimage notit" :-
@gp :- 3 tit="rotate=0.5pi" "plot \$img rotate=0.5pi with rgbimage notit" :-
@gp :- 4 tit="rotate=180 deg" "plot \$img rotate=180deg with rgbimage notit"
```
## Multiple sessions
## Named datasets
## Histograms (1D)

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docs/src/basic.md
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@ -139,24 +139,35 @@ can be replaced with a shorter version:
**Gnuplot.jl** can also display images, i.e. 2D arrays:
```@example abc
img = randn(Float64, 30, 50)
img[10,:] .= -4
img[10,:] .= -5
@gp img "w image notit"
saveas("basic7a") # hide
```
![](assets/basic7a.png)
Note that the first index corresponds to the `X` coordinate when the image is displayed.
Note that the first index in the `img` matrix corresponds to the `x` coordinate when the image is displayed.
The following example shows how to fix orientation of an image by means of the `using` clause (the `TestImages` package is required to run this example):
If the orientation is not the correct one you may adjust it with the gnuplot `rotate=` keyword (the following example requires the `TestImages` package to be installed):
```@example abc
using TestImages
img = testimage("lena");
@gp "set size square" "set autoscale fix" img "u 2:(-\$1):3:4:5 with rgbimage notit"
img = testimage("lighthouse");
@gp "set size square" "set autoscale fix" img "rotate=-90deg with rgbimage notit"
save(term="jpeg size 480,360", output="assets/basic7b.jpg") # hide
```
![](assets/basic7b.jpg)
To display a gray image use `with image` in place of `with rgbimage`, e.g.:
```@example abc
img = testimage("walkbridge");
@gp palette(:thermal) "set size square" "set autoscale fix" img "rotate=-0.5pi with image notit"
save(term="jpeg size 480,360", output="assets/basic7c.jpg") # hide
```
![](assets/basic7c.jpg)
Note that we used a custom palette (`:thermal`) and the rotation angle has been expressed in radians.
## [3D plots](@id plots3d)
3D plots follow the same rules as 2D ones, just replace the `@gp` macro with `@gsp` and add the required columns (according to the plotting style).