canvas-overview (#1087)

docs-2.0/nebula-explorer/canvas-operations/canvas-overview.md

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+# Canvas overview
+
+You can visually explore data on a canvas. This topic introduces the composition of a canvas and its related functions.
+
+Canvas overview diagram:
+
+![canvas](../figs/canvas-overview.png)
+
+## Tabs on the Top
+
+Click the plus sign ![canvas_tab](../figs/list-add.png) to add a new canvas. You can have operations on multiple canvases simultaneously.
+
+![canvas_overview](../figs/canvas-graphspace.png)
+
+- Canvas data on different canvases can come from the same graph space or from different graph spaces.
+- You can customize the name of a canvas except for the canvas in the left-most tab.
+
+## Visualization modes
+
+Graph data can be visually explored in **2D mode** and **3D mode**. For more information, [Visualization modes](visualization-mode.md).
+
+## Data storage
+
+Graph data on the current canvas can be stored by creating snapshots or exporting canvas data as images or CSV files.
+
+At the top right of the page, you can:
+
+- Click ![snapshot](../figs/graph-snapshot.png) to create a snapshot. For more information, see [Canvas snapshots](canvas-snapshot.md).
+- Click ![PNG](../figs/topbar-exportPNG.png) to store canvas data as images.
+- Click ![CSV](../figs/topbar-exportCSV.png) to store canvas data as CSV files.
+
+
+## Search box
+
+In the search box at the top left of the page, enter a VID or the property values of tags to locate target vertices.
+
+## Layouts
+
+Explorer provides 6 layouts to show the relationship between the data on a canvas.
+
+| Force | Dagre | Circular | Grid | Neural Network | Radial |
+| -------- | ------ | ------ | ----- | -------- | ----- |
+| ![graphView](../figs/Thumbnail-graphView.png) | ![treeView](../figs/Thumbnail-treeView.png) | ![sphereView](../figs/Thumbnail-sphereView.png) | ![grid](../figs/Thumbnail-Grid.png) | ![neural](../figs/Thumbnail-neuralNetwork.png) | ![radial](../figs/Thumbnail-Radial.png) |
+
+![layouts](../figs/layout.gif)
+
+## Minimap
+
+You can display the vertices on a canvas on full screen. You can also collapse the minimap, zoom in or zoom out the canvass, etc. The percentage of a canvas graph to the total is displayed in the lower-left corner of the minimap.
+
+![](../figs/thumbnail.png)
+
+## Data overview
+
+On the right side of the page, click ![list-left](../figs/list-left.png) to expand the data overview panel.
+
+![dataView](../figs/dataview.png)
+
+On the data overview panel, you are enabled to:
+
+- See the number of tags and edge types, and the number of the corresponding vertices and edges on a canvas. 
+- Click the tag color icon to customize the color, size, and icon of the vertices with the same tag.
+
+ !!! note
+ Vertices with the same tag have the same color. Right-click on a single vertex on a canvas to manually modify the style of the vertex.