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Implement placemark level of details selector #843

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Implement placemark level of details selector #843

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27 changes: 20 additions & 7 deletions src/shapes/Placemark.js
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Original file line number Diff line number Diff line change
Expand Up @@ -424,13 +424,7 @@ define([
* cannot be created or should not be created at the time this method is called.
*/
Placemark.prototype.makeOrderedRenderable = function (dc) {
var w, h, s,
offset;

this.determineActiveAttributes(dc);
if (!this.activeAttributes) {
return null;
}
var w, h, s, offset;

// Compute the placemark's model point and corresponding distance to the eye point. If the placemark's
// position is terrain-dependent but off the terrain, then compute it ABSOLUTE so that we have a point for
Expand All @@ -442,6 +436,14 @@ define([

this.eyeDistance = this.alwaysOnTop ? 0 : dc.eyePoint.distanceTo(this.placePoint);

// Extension point to override placemark attributes depending on camera distance
this.selectLevelOfDetail(dc, this, this.eyeDistance);

this.determineActiveAttributes(dc);
if (!this.activeAttributes) {
return null;
}

if (this.mustDrawLeaderLine(dc)) {
dc.surfacePointForMode(this.position.latitude, this.position.longitude, 0,
this.altitudeMode, this.groundPoint);
Expand Down Expand Up @@ -513,6 +515,17 @@ define([
return this;
};

/**
* Set the placemark attributes for the current distance to the camera and highlighted state.
*
* @param {DrawContext} dc The current render context
* @param {Placemark} placemark The placemark needing a level of detail selection
* @param {Number} cameraDistance The distance from the placemark to the camera (meters)
*/
Placemark.prototype.selectLevelOfDetail = function (dc, placemark, cameraDistance) {
// Intentionally empty. Can be override in application if required.
};

// Internal. Intentionally not documented.
Placemark.prototype.determineActiveAttributes = function (dc) {
if (this.highlighted && this.highlightAttributes) {
Expand Down