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Divide the draw features example into two examples

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This commit is contained in:
Tim Schaub
2016-10-16 16:38:00 -06:00
parent ec1ad89338
commit ac805e804b
4 changed files with 115 additions and 37 deletions
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9
examples/draw-features.html
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@@ -5,11 +5,8 @@ shortdesc: Example of using the ol.interaction.Draw interaction.
docs: >
Example of using the Draw interaction. Select a geometry type from the
dropdown above to start drawing. To finish drawing, click the last
point. To activate freehand drawing for lines and polygons, hold the `Shift`
key. Square drawing is achieved by using Circle mode with a `geometryFunction`
that creates a 4-sided regular polygon instead of a circle. Box drawing uses a
custom `geometryFunction` that takes start and end point of a line with 2
points and creates a rectangular box.
point. To activate freehand drawing for lines, polygons, and circles, hold
the `Shift` key.
tags: "draw, edit, freehand, vector"
---
<div id="map" class="map"></div>
@@ -20,8 +17,6 @@ tags: "draw, edit, freehand, vector"
<option value="LineString">LineString</option>
<option value="Polygon">Polygon</option>
<option value="Circle">Circle</option>
<option value="Square">Square</option>
<option value="Box">Box</option>
<option value="None">None</option>
</select>
</form>

32
examples/draw-features.js
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@@ -5,10 +5,6 @@ goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.source.OSM');
goog.require('ol.source.Vector');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');
var raster = new ol.layer.Tile({
source: new ol.source.OSM()
@@ -17,22 +13,7 @@ var raster = new ol.layer.Tile({
var source = new ol.source.Vector({wrapX: false});
var vector = new ol.layer.Vector({
source: source,
style: new ol.style.Style({
fill: new ol.style.Fill({
color: 'rgba(255, 255, 255, 0.2)'
}),
stroke: new ol.style.Stroke({
color: '#ffcc33',
width: 2
}),
image: new ol.style.Circle({
radius: 7,
fill: new ol.style.Fill({
color: '#ffcc33'
})
})
})
source: source
});
var map = new ol.Map({
@@ -50,18 +31,9 @@ var draw; // global so we can remove it later
function addInteraction() {
var value = typeSelect.value;
if (value !== 'None') {
var geometryFunction;
if (value === 'Square') {
value = 'Circle';
geometryFunction = ol.interaction.Draw.createRegularPolygon(4);
} else if (value === 'Box') {
value = 'Circle';
geometryFunction = ol.interaction.Draw.createBox();
}
draw = new ol.interaction.Draw({
source: source,
type: /** @type {ol.geom.GeometryType} */ (value),
geometryFunction: geometryFunction
type: /** @type {ol.geom.GeometryType} */ (typeSelect.value)
});
map.addInteraction(draw);
}

25
examples/draw-shapes.html Normal file
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@@ -0,0 +1,25 @@
---
layout: example.html
title: Draw Shapes
shortdesc: Using the ol.interaction.Draw to create regular shapes
docs: >
This demonstrates the use of the `geometryFunction` option for the
`ol.interaction.Draw`. Select a shape type from the dropdown above to start
drawing. To activate freehand drawing, hold the `Shift` key. Square drawing is
achieved by using `type: 'Circle'` type with a `geometryFunction` that creates
a 4-sided regular polygon instead of a circle. Box drawing uses `type: 'Circle'`
with a `geometryFunction` that creates a box-shaped polygon instead of a
circle. Star drawing uses a custom geometry function that coverts a circle
into a start using the center and radius provided by the draw interaction.
tags: "draw, edit, freehand, vector"
---
<div id="map" class="map"></div>
<form class="form-inline">
<label>Shape type &nbsp;</label>
<select id="type">
<option value="Square">Square</option>
<option value="Box">Box</option>
<option value="Star">Star</option>
<option value="None">None</option>
</select>
</form>

86
examples/draw-shapes.js Normal file
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@@ -0,0 +1,86 @@
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.geom.Polygon');
goog.require('ol.interaction.Draw');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.source.OSM');
goog.require('ol.source.Vector');
var raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
var source = new ol.source.Vector({wrapX: false});
var vector = new ol.layer.Vector({
source: source
});
var map = new ol.Map({
layers: [raster, vector],
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
var typeSelect = document.getElementById('type');
var draw; // global so we can remove it later
function addInteraction() {
var value = typeSelect.value;
if (value !== 'None') {
var geometryFunction;
if (value === 'Square') {
value = 'Circle';
geometryFunction = ol.interaction.Draw.createRegularPolygon(4);
} else if (value === 'Box') {
value = 'Circle';
geometryFunction = ol.interaction.Draw.createBox();
} else if (value === 'Star') {
value = 'Circle';
geometryFunction = function(coordinates, geometry) {
if (!geometry) {
geometry = new ol.geom.Polygon(null);
}
var center = coordinates[0];
var last = coordinates[1];
var dx = center[0] - last[0];
var dy = center[1] - last[1];
var radius = Math.sqrt(dx * dx + dy * dy);
var rotation = Math.atan2(dy, dx);
var newCoordinates = [];
var numPoints = 12;
for (var i = 0; i < numPoints; ++i) {
var angle = rotation + i * 2 * Math.PI / numPoints;
var fraction = i % 2 === 0 ? 1 : 0.5;
var offsetX = radius * fraction * Math.cos(angle);
var offsetY = radius * fraction * Math.sin(angle);
newCoordinates.push([center[0] + offsetX, center[1] + offsetY]);
}
newCoordinates.push(newCoordinates[0].slice());
geometry.setCoordinates([newCoordinates]);
return geometry;
};
}
draw = new ol.interaction.Draw({
source: source,
type: /** @type {ol.geom.GeometryType} */ (value),
geometryFunction: geometryFunction
});
map.addInteraction(draw);
}
}
/**
* Handle change event.
*/
typeSelect.onchange = function() {
map.removeInteraction(draw);
addInteraction();
};
addInteraction();