Merge branch '31113-add-guidelines-for-illustrations' into 'master'

Guidelines for illustrations

See merge request gitlab-org/gitlab-ce!13097

doc/development/ux_guide/illustrations.md

+# Illustrations
+
+The illustrations should always align with topics and goals in specific context.
+
+## Principles
+
+#### Be simple.
+- For clarity, we use simple and specific elements to create our illustrations.
+
+#### Be optimistic.
+- We are an open-minded, optimistic, and friendly team. We should reflect those values in our illustrations to connect with our brand experience.
+
+#### Be gentle.
+- Our illustrations assist users in understanding context and guide users in the right direction. Illustrations are supportive, so they should be obvious but not aggressive.
+
+
+## Style
+
+#### Shapes
+- All illustrations are geometric rather than organic.
+- The illustrations are made by circles, rectangles, squares, and triangles.
+
+<img src="img/illustrations-geometric.png" width=224px alt="Example for geometric" />
+
+#### Stroke
+- Standard border thickness: **4px**
+- Depending on the situation, border thickness can be changed to **3px**. For example, when the illustration size is small, an illustration with 4px border thickness would look tight. In this case, the border thickness can be changed to 3px.
+- We use **rounded caps** and **rounded corner**.
+
+| Do | Don't |
+| -------- | -------- |
+| <img src="img/illustrations-caps-do.png" width= 133px alt="Do: caps and corner" /> | <img src="img/illustrations-caps-don't.png" width= 133px alt="Don't: caps and corner"/> |
+
+#### Radius
+- Standard corner radius: **10px**
+- Depending on the situation, corner radius can be changed to **5px**. For example, when the illustration size is small, an illustration with 10px corner radius would be over-rounded. In this case, the corner radius can be changed to 5px.
+
+<img src="img/illustrations-border-radius.png" width= 464px alt="Example for border radius"/>
+
+#### Size
+Depends on the situation, the illustration size can be the 3 types below:
+
+**Large**
+* Use case: Empty states, error pages(e.g. 404, 403)
+* For vertical layout, the illustration should not larger than **430*300 px**.
+* For horizontal layout, the illustration should not larger than **430*380 px**.
+
+| Vertical layout | Horizontal layout |
+| --------------- | ----------------- |
+| <img src="img/illustration-size-large-vertical.png" />  | <img src="img/illustration-size-large-horizontal.png" />
+
+**Medium**
+* Use case: Banner
+* The illustration should not larger than **240*160 px**
+* The illustration should keep simple and clear. We recommend not including too many elements in the medium size illustration.
+
+<img src="img/illustration-size-medium.png" width=983px />
+
+**Small**
+* Use case: Graphics for explanatory text, graphics for status.
+* The illustration should not larger than **160*90 px**.
+* The illustration should keep simple and clear. We recommend not including too many elements in the small size illustration.
+
+<img src="img/illustration-size-small.png" width=983px />
+
+**Illustration on mobile**
+- Keep the proportions in original ratio.
+
+#### Colors palette
+
+For consistency, we recommend choosing colors from our color palette.
+
+| Orange | Purple | Grey |
+| -------- | -------- | -------- |
+| <img src="img/illustrations-color-orange.png" width= 160px alt="Orange" /> | <img src="img/illustrations-color-purple.png" width= 160px alt="Purple" /> | <img src="img/illustrations-color-grey.png" width= 160px alt="Grey" /> |
+| #FC6D26   | #6B4FBB | #EEEEEE |
+
+#### Don't
+- Don't include the typography in the illustration.
+- Don't include tanuki in the illustration. If necessary, we recommend having tanuki monochromatic.
+
+---
+
+| Orange | Purple |
+| -------- | -------- |
+| <img src="img/illustrations-palette-oragne.png" width= 160px alt="Palette - Orange" /> | <img src="img/illustrations-palette-purple.png" width= 160px alt="Palette - Purple" /> |

doc/development/ux_guide/index.md

@@ -21,6 +21,11 @@ Guidance on the timing, curving and motion for GitLab.
 
 ---
 
+### [Illustrations](illustrations.md)
+Guidelines for principals and styles related to illustrations for GitLab.
+
+---
+
 ### [Copy](copy.md)
 Conventions on text and messaging within labels, buttons, and other components.