Methods for programmatically manipulating sketches while digitizing features. r=bartvde (closes #3343)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12103 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/editing-methods.js

@@ -0,0 +1,83 @@
+var map = new OpenLayers.Map({
+    div: "map",
+    layers: [
+        new OpenLayers.Layer.WMS(
+            "Global Imagery",
+            "http://maps.opengeo.org/geowebcache/service/wms",
+            {layers: "bluemarble"},
+            {tileOrigin: new OpenLayers.LonLat(-180, -90)}
+        ),
+        new OpenLayers.Layer.Vector()
+    ],
+    center: new OpenLayers.LonLat(0, 0),
+    zoom: 1
+});
+
+var draw = new OpenLayers.Control.DrawFeature(
+    map.layers[1], OpenLayers.Handler.Path
+);
+map.addControl(draw);
+draw.activate();
+
+// handle clicks on method links
+$("insertXY").onclick = function() {
+    var values = parseInput(
+        window.prompt(
+            "Enter map coordinates for new point (e.g. '-111, 46')", "x, y"
+        )
+    );
+    if (values != null) {
+        draw.insertXY(values[0], values[1]);
+    }
+}
+$("insertDeltaXY").onclick = function() {
+    var values = parseInput(
+        window.prompt(
+            "Enter offset values for new point (e.g. '15, -10')", "dx, dy"
+        )
+    );
+    if (values != null) {
+        draw.insertDeltaXY(values[0], values[1]);
+    }
+}
+$("insertDirectionLength").onclick = function() {
+    var values = parseInput(
+        window.prompt(
+            "Enter direction and length offset values for new point (e.g. '-45, 10')", "direction, length"
+        )
+    );
+    if (values != null) {
+        draw.insertDirectionLength(values[0], values[1]);
+    }
+}
+$("insertDeflectionLength").onclick = function() {
+    var values = parseInput(
+        window.prompt(
+            "Enter deflection and length offset values for new point (e.g. '15, 20')", "deflection, length"
+        )
+    );
+    if (values != null) {
+        draw.insertDeflectionLength(values[0], values[1]);
+    }
+}
+$("cancel").onclick = function() {
+    draw.cancel();
+}
+$("finishSketch").onclick = function() {
+    draw.finishSketch();
+}
+
+function parseInput(text) {
+    var values = text.split(",");
+    if (values.length !== 2) {
+        values = null;
+    } else {
+        values[0] = parseFloat(values[0]);
+        values[1] = parseFloat(values[1]);
+        if (isNaN(values[0]) || isNaN(values[1])) {
+            window.alert("The two values must be numeric.");
+            values = null;
+        }
+    }
+    return values;
+}