柱状图把值编码为同一基线上矩形的长度。威廉·普莱费尔，1786年《商业与政治图集》。
工作报告、广告与作业中适合一次性比较少量类别。若类别过多、3D 或双轴，换一种形式。
Parts
- 标记 — The core mark of 柱状图 is 同一基线上矩形的长度.
- 尺度 — The scale must show zero (or a declared break) and units.
- 轴 — Axis titles name the variable, not a mood.
- 图例 — A legend is weaker than a direct label. Write beside the mark when you can.
- 标签 — Numbers are optional. If comparison is the job, label the ends only.
- 网格 — Keep the grid faint. Data should own the ink.
- 注释 — One annotation sentence. Date the source.
- 外框 — A thin frame. Never a 3-D box.
Variants
- 条形图 — Variant 1 of 柱状图. Same encoding, different layout.
- 分类柱 — Variant 2 of 柱状图. Same encoding, different layout.
- 普莱费尔柱 — Variant 3 of 柱状图. Same encoding, different layout.
- 柱状图 4 — Variant 4 of 柱状图. Same encoding, different layout.
Labels
- 轴 — On 柱状图, make Mark readable.
- 图例 — On 柱状图, make Scale readable.
- 标签 — On 柱状图, make Axis readable.
- 网格 — On 柱状图, make Legend readable.
- 注释 — On 柱状图, make Label readable.
柱状图: honour 同一基线上矩形的长度, and switch when 类别过多、3D 或双轴.