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52 lines
1.6 KiB
Markdown
52 lines
1.6 KiB
Markdown
# CanvasOverlay
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Allows applications to overlay data on top of maps using a canvas.
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## Properties
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##### `redraw` (Function)
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Called every time the map updates.
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Parameters:
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- `ctx` {CanvasRenderingContext2D} - rendering context of the canvas
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- `width` {Number} - width of the viewport
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- `height` {Number} - height of the viewport
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- `project` {Function} - get screen position `[x, y]` from geo coordinates `[lng, lat]`
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- `unproject` {Function} - get geo coordinates `[lng, lat]` from screen position `[x, y]`
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##### `captureScroll` (Boolean)
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- default: `false`
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Stop propagation of mouse wheel event to the map component. Can be used to stop map from zooming when this component is scrolled.
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##### `captureDrag` (Boolean)
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- default: `false`
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Stop propagation of dragstart event to the map component. Can be used to stop map from panning when this component is dragged.
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##### `captureClick` (Boolean)
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- default: `false`
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Stop propagation of click event to the map component. Can be used to stop map from calling the `onClick` callback when this component is clicked.
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##### `captureDoubleClick` (Boolean)
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- default: `false`
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Stop propagation of dblclick event to the map component. Can be used to stop map from zooming when this component is double clicked.
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##### `capturePointerMove` (Boolean)
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- default: `false`
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Stop propagation of pointermove event to the map component. Can be used to stop map from calling the `onMouseMove` or `onTouchMove` callback when this component is hovered.
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## Source
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[canvas-overlay.js](https://github.com/visgl/react-map-gl/tree/6.1-release/src/overlays/canvas-overlay.js)
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