如何根據數據逐漸設置背景

Question

我試圖將背景畫得更「紅」，冒號2的數字越高。但我沒有運氣完成這件事。

set terminal wx size 700,300 
set palette defined (0 "white", 1 "red") 
set autoscale cbfix 
set autoscale xfix 
set autoscale yfix 
set y2range [0:1] 
set y2tics 

$data << EOD 
1501293600 0 2348.81 
1501297200 8 2338.23 
1501300800 7 2325.25 
1501304400 16 2349.49 
1501308000 13 2354.78 
1501311600 18 2349.97 
1501315200 14 2361.19 
1501318800 16 2350.1 
1501322400 8 2325.57 
1501326000 12 2296.07 
1501329600 24 2309.74 
1501333200 30 2301.21 
1501336800 30 2308.85 
1501340400 19 2321.49 
1501344000 24 2315.54 
1501347600 17 2331.58 
1501351200 17 2350.56 
1501354800 20 2344.22 
1501358400 15 2339.81 
1501362000 19 2326.6 
1501365600 8 2313.58 
1501369200 13 2318.37 
EOD 

plot '$data' using 1:(1):2 with image axes x1y2, \ # just use 1 (the max y2 value) as y value 
    '$data' using 1:3 with lines axes x1y1 

Answer 1

你可以嘗試使用彩色框樣式，而不是像風格：

set style fill solid 
plot '$data' using 1:(1):2 with boxes linecolor palette axes x1y2, \ 
    '$data' using 1:3 with lines axes x1y1 

結果：