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颜色很重要

边和节点都可以设颜色，颜色的值可以在http://www.graphviz.org/content/color-names中查到。

下面我们举个例子，看看颜色的作用：

digraph G{
node [shape = "Mrecord", color="skyblue", style="filled",fontname="SimSun"];
edge [color="darkgreen", fontname="SimHei"];

armv4[label="ARM v4", color="antiquewhite4"]
armv4T[label="ARM-V4T", color="bisque3"]
ARMv5TE[label="ARMv5TE",color="burlywood"]
ARMv6[label="ARM v6",color="cyan3"]
ARMv7A[label="ARM v7-A",color="gold1"]
ARMv8A[label="ARMv8-A",color="chartreuse1"]

arm32[label="ARM 32位指令集",color="darkolivegreen1"]
thumb16[label="Thumb指令集",color="darkseagreen3"]
thumb32[label="Thumb2指令集",color="chocolate3"]
arm64 [label="ARM 64位指令集",color="deepskyblue"]

armv4 -> armv4T [label="发展",color="deeppink"]
armv4T -> ARMv5TE [label="发展",color="deeppink"]
ARMv5TE -> ARMv6 [label="发展",color="deeppink"]
ARMv6 -> ARMv7A [label="发展",color="deeppink"]
ARMv7A -> ARMv8A [label="发展",color="deeppink"]

armv4 -> arm32 [label="支持"]
armv4T -> arm32 [label="支持"]
ARMv5TE -> arm32 [label="支持"]
ARMv6 -> arm32 [label="支持"]
ARMv7A -> arm32 [label="支持"]
ARMv8A -> arm32 [label="支持"]

armv4T -> thumb16 [label="支持"]
ARMv5TE -> thumb16 [label="支持"]
ARMv6 -> thumb16 [label="支持"]

ARMv6 -> thumb32 [label="可选"];
ARMv7A -> thumb32 [label="支持"]
ARMv8A -> thumb32 [label="支持"]

ARMv8A -> arm64 [label="支持"]
}
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