基于渐变的条件着色 [英] Conditional coloring based on a gradient

问题描述

请考虑：

 操作[
 Row [{
图形[Disk []]， 
 Graphics [{
 Polygon [{{0，0}，{3，0}，{3，1}，{0，1}}，
 VertexColors  - > {白色，混合[{白色，蓝色}]，
混合[{白色，蓝色}]，白色}]，
黑色，厚，
线[{{i，0}， {i，1}}]}，ImageSize  - > 300]}]，
 {i，0，3}] 
  

在渐变填充

怎么可能我使用位于黑线之下的颜色对磁盘进行着色？

解决方案

这是一种解决方案，因为左侧的颜色是白色，渐变线性。

  With [{max = 3，color = Blend [{White，Blue}]}，
操作[
 Row [{Graphics [{Opacity [i / max]，color，Disk []}]，
 Graphics [{Polygon [{{0，0}，{max，0}，{max，1}，{0，1}}，
 VertexColors  - > {白色，颜色，颜色，白色}]，黑色，厚，
行[{{i，0}，{i，1}}]}，ImageSize  - > 300]}]，{i，0，max}]] 
  

---

如果每一端有两种不同的颜色（即 White 以外的其他颜色）， Opacity 方法不起作用。相反，您可以将可选的混合分数参数用于 Blend 所需比例的颜色。这里有一个例子：
$ b $ pre $ 使用[{max = 3，color1 = Red，color2 = Green}，
Manipulate [
行{[Graphics [{Blend [{color1，color2}，i / max]，Disk []}]，
Graphics [{Polygon [{{0，0}，{max，0} ，{max，1}，{0,1}}，
VertexColors - > {color1，color2，color2，color1}]，黑色，
Thick，Line [{{i，0}，{i，1}}]}，ImageSize - > 300]}]，{i，0，
max}]]


Please consider :

Manipulate[
Row[{
Graphics[Disk[]], 
Graphics[{
 Polygon[{{0, 0}, {3, 0}, {3, 1}, {0, 1}},
 VertexColors -> {White, Blend[{White, Blue}], 
 Blend[{White, Blue}], White}],
 Black, Thick,
 Line[{{i, 0}, {i, 1}}]}, ImageSize -> 300]}], 
{i, 0, 3}]

Using Szabolcs`s solution on Gradient Filling

How could I color the disk with the color located underneath the Black Line ?

解决方案

Here is one solution which works because the color on the left is White and the gradient is linear.

With[{max = 3, color = Blend[{White, Blue}]}, 
 Manipulate[
  Row[{Graphics[{Opacity[i/max], color, Disk[]}], 
    Graphics[{Polygon[{{0, 0}, {max, 0}, {max, 1}, {0, 1}}, 
       VertexColors -> {White, color, color, White}], Black, Thick, 
      Line[{{i, 0}, {i, 1}}]}, ImageSize -> 300]}], {i, 0, max}]]

---

If you had two different colors for each end (i.e., something other than White), the Opacity approach won't work. Instead, you can use the optional blending fraction argument to Blend the colors in the desired proportion. Here's an example:

With[{max = 3, color1 = Red, color2 = Green}, 
 Manipulate[
  Row[{Graphics[{Blend[{color1, color2}, i/max], Disk[]}], 
    Graphics[{Polygon[{{0, 0}, {max, 0}, {max, 1}, {0, 1}}, 
       VertexColors -> {color1, color2, color2, color1}], Black, 
      Thick, Line[{{i, 0}, {i, 1}}]}, ImageSize -> 300]}], {i, 0, 
   max}]]

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