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annotator-helper.js
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annotator-helper.js
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/**
* Control to duplicate features.
*/
DuplicateFeature = OpenLayers.Class(OpenLayers.Control, {
initialize : function(layer, options) {
OpenLayers.Control.prototype.initialize.apply(this, [ options ]);
this.layer = layer;
this.handler = new OpenLayers.Handler.Feature(this, layer, {
click : this.clickFeature
});
},
clickFeature : function(feature) {
this.layer.addFeatures([ feature.clone() ]);
},
setMap : function(map) {
this.handler.setMap(map);
OpenLayers.Control.prototype.setMap.apply(this, arguments);
},
CLASS_NAME : 'OpenLayers.Control.DuplicateFeature'
});
/**
* TransformFeature that support irregular transformations.
*/
TransformFeature = OpenLayers.Class(OpenLayers.Control.TransformFeature, {
/**
* APIProperty: irregular
* {Boolean} Make scaling/resizing work irregularly. If true then
* dragging a handle causes the feature to resize in the direction
* of movement. If false then the feature resizes symetrically
* about it's center.
*/
irregular: false,
/**
* Method: createBox
* Creates the box with all handles and transformation handles.
*/
createBox: function() {
var control = this;
this.center = new OpenLayers.Geometry.Point(0, 0);
var box = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(-1, -1),
new OpenLayers.Geometry.Point(0, -1),
new OpenLayers.Geometry.Point(1, -1),
new OpenLayers.Geometry.Point(1, 0),
new OpenLayers.Geometry.Point(1, 1),
new OpenLayers.Geometry.Point(0, 1),
new OpenLayers.Geometry.Point(-1, 1),
new OpenLayers.Geometry.Point(-1, 0),
new OpenLayers.Geometry.Point(-1, -1)
]), null,
typeof this.renderIntent == "string" ? null : this.renderIntent
);
// Override for box move - make sure that the center gets updated
box.geometry.move = function(x, y) {
control._moving = true;
OpenLayers.Geometry.LineString.prototype.move.apply(this, arguments);
control.center.move(x, y);
delete control._moving;
};
// Overrides for vertex move, resize and rotate - make sure that
// handle and rotationHandle geometries are also moved, resized and
// rotated.
var vertexMoveFn = function(x, y) {
OpenLayers.Geometry.Point.prototype.move.apply(this, arguments);
this._rotationHandle && this._rotationHandle.geometry.move(x, y);
this._handle.geometry.move(x, y);
};
var vertexResizeFn = function(scale, center, ratio) {
OpenLayers.Geometry.Point.prototype.resize.apply(this, arguments);
this._rotationHandle && this._rotationHandle.geometry.resize(
scale, center, ratio);
this._handle.geometry.resize(scale, center, ratio);
};
var vertexRotateFn = function(angle, center) {
OpenLayers.Geometry.Point.prototype.rotate.apply(this, arguments);
this._rotationHandle && this._rotationHandle.geometry.rotate(
angle, center);
this._handle.geometry.rotate(angle, center);
};
// Override for handle move - make sure that the box and other handles
// are updated, and finally transform the feature.
var handleMoveFn = function(x, y) {
var oldX = this.x, oldY = this.y;
OpenLayers.Geometry.Point.prototype.move.call(this, x, y);
if(control._moving) {
return;
}
var evt = control.dragControl.handlers.drag.evt;
var preserveAspectRatio = !control._setfeature &&
control.preserveAspectRatio;
var reshape = !preserveAspectRatio && !(evt && evt.shiftKey);
var oldGeom = new OpenLayers.Geometry.Point(oldX, oldY);
var centerGeometry = control.center;
this.rotate(-control.rotation, centerGeometry);
oldGeom.rotate(-control.rotation, centerGeometry);
var dx1 = this.x - centerGeometry.x;
var dy1 = this.y - centerGeometry.y;
var dx0 = dx1 - (this.x - oldGeom.x);
var dy0 = dy1 - (this.y - oldGeom.y);
// jvieira: patch to support irregular transformations
if (control.irregular && !control._setfeature) {
dx1 -= (this.x - oldGeom.x) / 2;
dy1 -= (this.y - oldGeom.y) / 2;
}
// end patch
this.x = oldX;
this.y = oldY;
var scale, ratio = 1;
if (reshape) {
scale = Math.abs(dy0) < 0.00001 ? 1 : dy1 / dy0;
ratio = (Math.abs(dx0) < 0.00001 ? 1 : (dx1 / dx0)) / scale;
} else {
var l0 = Math.sqrt((dx0 * dx0) + (dy0 * dy0));
var l1 = Math.sqrt((dx1 * dx1) + (dy1 * dy1));
scale = l1 / l0;
}
// rotate the box to 0 before resizing - saves us some
// calculations and is inexpensive because we don't drawFeature.
control._moving = true;
control.box.geometry.rotate(-control.rotation, centerGeometry);
delete control._moving;
control.box.geometry.resize(scale, centerGeometry, ratio);
control.box.geometry.rotate(control.rotation, centerGeometry);
control.transformFeature({scale: scale, ratio: ratio});
// jvieira: patch to support irregular transformations
if (control.irregular && !control._setfeature) {
var newCenter = centerGeometry.clone();
newCenter.x += Math.abs(oldX - centerGeometry.x) < 0.00001 ? 0 : (this.x - oldX);
newCenter.y += Math.abs(oldY - centerGeometry.y) < 0.00001 ? 0 : (this.y - oldY);
control.box.geometry.move(this.x - oldX, this.y - oldY);
control.transformFeature({center: newCenter});
}
// end patch
};
// Override for rotation handle move - make sure that the box and
// other handles are updated, and finally transform the feature.
var rotationHandleMoveFn = function(x, y){
var oldX = this.x, oldY = this.y;
OpenLayers.Geometry.Point.prototype.move.call(this, x, y);
if(control._moving) {
return;
}
var evt = control.dragControl.handlers.drag.evt;
var constrain = (evt && evt.shiftKey) ? 45 : 1;
var centerGeometry = control.center;
var dx1 = this.x - centerGeometry.x;
var dy1 = this.y - centerGeometry.y;
var dx0 = dx1 - x;
var dy0 = dy1 - y;
this.x = oldX;
this.y = oldY;
var a0 = Math.atan2(dy0, dx0);
var a1 = Math.atan2(dy1, dx1);
var angle = a1 - a0;
angle *= 180 / Math.PI;
control._angle = (control._angle + angle) % 360;
var diff = control.rotation % constrain;
if(Math.abs(control._angle) >= constrain || diff !== 0) {
angle = Math.round(control._angle / constrain) * constrain -
diff;
control._angle = 0;
control.box.geometry.rotate(angle, centerGeometry);
control.transformFeature({rotation: angle});
}
};
var handles = new Array(8);
var rotationHandles = new Array(4);
var geom, handle, rotationHandle;
for(var i=0; i<8; ++i) {
geom = box.geometry.components[i];
handle = new OpenLayers.Feature.Vector(geom.clone(), null,
typeof this.renderIntent == "string" ? null :
this.renderIntent);
if(i % 2 == 0) {
rotationHandle = new OpenLayers.Feature.Vector(geom.clone(),
null, typeof this.rotationHandleSymbolizer == "string" ?
null : this.rotationHandleSymbolizer);
rotationHandle.geometry.move = rotationHandleMoveFn;
geom._rotationHandle = rotationHandle;
rotationHandles[i/2] = rotationHandle;
}
geom.move = vertexMoveFn;
geom.resize = vertexResizeFn;
geom.rotate = vertexRotateFn;
handle.geometry.move = handleMoveFn;
geom._handle = handle;
handles[i] = handle;
}
this.box = box;
this.rotationHandles = rotationHandles;
this.handles = handles;
}
});