gnuplot：绘制正确的比例&位于图像顶部 [英] gnuplot: Plot in correct scale & position on top of image

问题描述

我的问题是在图像上绘制一个情节。
图像不仅仅是一个很好的背景，而且应该与情节对齐。

情节是许多有色点代表汽车的速度和位置在坐标系中。这是有效的。

现在我想用一张道路图像排列情节，我有问题。

数据文件如下所示：

  -60.2501 106.115 0 0 
 -68.1729 98.0388 0 0 
 [...] 
  

x-pos，y-pos，speed，ignore last last

以下是我目前的情况：

  set multiplot 
 
 set yrange [-1280：1280] 
 set xrange [-1280：1280] 
＃set xrange [-1470：1280] 
 
 set size ratio 1 
 plot'BL.jpg'binary filetype = jpg origin =（ -  1280，-1280）with rgbimage 
 
 set origin 0,0 
 set size ratio 1 
 
 set yrange [-1280：1280] 
 set xrange [-1280：1280] 
 set key autotitle columnhead 
 set palette defined（0black，0.25blue ，0.5红色，0.75黄色，1绿色）
绘图'output.txt'使用1：2：3使用点调色板pt 6 ps 0.1 
 
 unset multiplot 
  

悲伤地沿着x轴它没有排列：

（sor ry，该网站不允许我发布2个以上的链接（需要10个声望））

解决方案

你不需要为此使用 multiplot ，只需用一个 plot 命令绘制两个文件（感谢提示：））：

 重置
设置尺寸比率1 
 set autoscale fix 
 set key autotitle columnhead 
 set palette defined（0black，0.25blue，0.5red，0.75yellow，1green）
 plot'BL.jpg'binary filetype = jpg center =（0,0）with rgbimage notitle，\ 
'output.txt'with 1：2：3 with points palette pt 6 ps 0.1 title columnheader（1） 
  

这给出：

注意：

• 设置自动缩放修复使用紧密范围（ x ， y 和 cb ），没有expandi到下一个抽搐。




• 使用 center =（0,0）删除最后一个显式依赖项确切的图像尺寸

My problem is drawing a plot atop an image. The image is not just meant to be a nice background but should line up with the plot.

The plot is many colored points representing a car's speed and position in a coordinates system. That works.

Now I want to line up the plot with an image of the road and there I have problems.

The data file looks like this:

-60.2501 106.115 0 0
-68.1729 98.0388 0 0
[...]

x-pos, y-pos,speed, ignore last number

Here is what I have so far:

set multiplot

set yrange [-1280:1280]
set xrange [-1280:1280]
# set xrange [-1470:1280]

set size ratio 1
plot 'BL.jpg' binary filetype=jpg origin = (-1280,-1280) with rgbimage

set origin 0, 0
set size ratio 1

set yrange [-1280:1280]
set xrange [-1280:1280]
set key autotitle columnhead
set palette defined (0 "black", 0.25 "blue", 0.5 "red", 0.75 "yellow", 1 "green")
plot 'output.txt' using 1:2:3 with points palette pt 6 ps 0.1

unset multiplot

Sadly along the x-axis it is not lined up:

http://www.abload.de/img/doesnotlineuposs6n.png (1280 x 960 Pixels, 311KB)

By adjusting some numbers I can kind of line it up but that is just random guessing.

I tried adding this after the set multiplot :

set lmargin at screen 0.1
set rmargin at screen 0.98
set tmargin at screen 0.98
set bmargin at screen 0.2

which results in a bit better fit but now the scale is wrong?

Also the road image disappears when zooming in by selecting a rectangle with RMB?

link to example data file and track image: http://pastebin.com/e5Yy5BaZ (sorry, the site does not allow me to post more than 2 links (need 10 reputation))

解决方案

You don't need to use multiplot for this, just plot the two files with a single plot command (Thanks for the hint :)):

reset
set size ratio 1
set autoscale fix
set key above autotitle columnhead
set palette defined (0 "black", 0.25 "blue", 0.5 "red", 0.75 "yellow", 1 "green")
plot 'BL.jpg' binary filetype=jpg center=(0,0) with rgbimage notitle,\
     'output.txt' using 1:2:3 with points palette pt 6 ps 0.1 title columnheader(1)

This gives:

Notes:

• set autoscale fix uses tight ranges (for x, y and cb), without expanding to the next tic.

• Using center=(0,0) removes the last explicit dependency on the exact image dimensions

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