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feat: show vertices of drawn polygon #57

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Merged
jessicamcinchak merged 2 commits into from
Sep 21, 2021
Merged

feat: show vertices of drawn polygon #57

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deaa378
show vertices of drawing, red translucent fill instead of white
jessicamcinchak Sep 12, 2021
b56c175
tidy up
jessicamcinchak Sep 21, 2021
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2 changes: 1 addition & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@
/>
</head>
<body>
<my-map zoom="18" drawMode />
<my-map zoom="18" maxZoom="20" drawMode />

<script>
const map = document.querySelector("my-map");
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61 changes: 44 additions & 17 deletions src/draw.ts
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Original file line number Diff line number Diff line change
@@ -1,11 +1,23 @@
import MultiPoint from 'ol/geom/MultiPoint';
import { Draw, Modify, Snap } from "ol/interaction";
import { Vector as VectorLayer } from "ol/layer";
import { Vector as VectorSource } from "ol/source";
import { Circle as CircleStyle, Fill, Stroke, Style } from "ol/style";
import { Circle as CircleStyle, Fill, RegularShape, Stroke, Style } from "ol/style";

const redLineStroke = new Stroke({
color: "#ff0000",
const redLineBase = {
color: '#ff0000',
width: 3,
};

const redLineStroke = new Stroke(redLineBase);

const redDashedStroke = new Stroke({
...redLineBase,
lineDash: [2, 8],
});

const redLineFill = new Fill({
color: "rgba(255, 0, 0, 0.1)",
});

const drawingPointer = new CircleStyle({
Expand All @@ -15,37 +27,52 @@ const drawingPointer = new CircleStyle({
}),
});

const drawingVertices = new Style({
image: new RegularShape({
fill: new Fill({
color: "#fff"
}),
stroke: new Stroke({
color: "#ff0000",
width: 2,
}),
points: 4, // squares
radius: 5,
angle: Math.PI / 4,
}),
geometry: function (feature) {
// return the coordinates of the drawn polygon
const coordinates = feature.getGeometry().getCoordinates()[0];
return new MultiPoint(coordinates);
},
});

export const drawingSource = new VectorSource();

export const drawingLayer = new VectorLayer({
source: drawingSource,
style: new Style({
fill: new Fill({
color: "rgba(255, 255, 255, 0.4)",
style: [
new Style({
fill: redLineFill,
stroke: redLineStroke,
}),
stroke: redLineStroke,
}),
drawingVertices,
]
});

export const draw = new Draw({
source: drawingSource,
type: "Polygon",
style: new Style({
stroke: new Stroke({
color: "#ff0000",
width: 3,
lineDash: [2, 8],
}),
fill: new Fill({
color: "rgba(255, 255, 255, 0.2)",
}),
stroke: redDashedStroke,
fill: redLineFill,
image: drawingPointer,
}),
});

export const snap = new Snap({
source: drawingSource,
pixelTolerance: 5,
pixelTolerance: 15,
});

export const modify = new Modify({
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