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31 lines
970 B
Go
31 lines
970 B
Go
// Copyright 2016, 2017 Florian Pigorsch. All rights reserved.
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//
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package sm
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import (
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"github.com/fogleman/gg"
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"github.com/golang/geo/s2"
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)
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// MapObject is the interface for all objects on the map
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type MapObject interface {
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// Bounds returns the geographical boundary rect (excluding the actual pixel dimensions).
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Bounds() s2.Rect
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// ExtraMarginPixels returns the left, top, right, bottom pixel margin of the object.
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ExtraMarginPixels() (float64, float64, float64, float64)
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// Draw draws the object in the given graphical context.
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Draw(dc *gg.Context, trans *Transformer)
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}
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// CanDisplay checks if pos is generally displayable (i.e. its latitude is in [-85,85])
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func CanDisplay(pos s2.LatLng) bool {
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const minLatitude float64 = -85.0
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const maxLatitude float64 = 85.0
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return (minLatitude <= pos.Lat.Degrees()) && (pos.Lat.Degrees() <= maxLatitude)
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}
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