* Example billboards *
*
1.0 enlarges the billboard while a scale less than 1.0 shrinks it.
* *
0.5, 1.0, and 2.0.
* x increases from left to right, and y increases from top to bottom.
* *
default |
* b.pixeloffset = new Cartesian2(50, 25); |
*
x points towards the viewer's
* right, y points up, and z points into the screen.
* * An eye offset is commonly used to arrange multiple billboards or objects at the same position, e.g., to * arrange a billboard above its corresponding 3D model. *
* Below, the billboard is positioned at the center of the Earth but an eye offset makes it always * appear on top of the Earth regardless of the viewer's or Earth's orientation. **
 |
*  |
*
b.eyeOffset = new Cartesian3(0.0, 8000000.0, 0.0);
* image.
* This has two common use cases. First, the same white texture may be used by many different billboards,
* each with a different color, to create colored billboards. Second, the color's alpha component can be
* used to make the billboard translucent as shown below. An alpha of 0.0 makes the billboard
* transparent, and 1.0 makes the billboard opaque.
* *
default |
* alpha : 0.5 |
*
alignedAxis.
* @memberof BillboardGraphics.prototype
* @type {Property}
* @default 0
*/
rotation : createPropertyDescriptor('rotation'),
/**
* Gets or sets the {@link Cartesian3} Property specifying the unit vector axis of rotation
* in the fixed frame. When set to Cartesian3.ZERO the rotation is from the top of the screen.
* @memberof BillboardGraphics.prototype
* @type {Property}
* @default Cartesian3.ZERO
*/
alignedAxis : createPropertyDescriptor('alignedAxis'),
/**
* Gets or sets the boolean Property specifying if this billboard's size will be measured in meters.
* @memberof BillboardGraphics.prototype
* @type {Property}
* @default false
*/
sizeInMeters : createPropertyDescriptor('sizeInMeters'),
/**
* Gets or sets the numeric Property specifying the width of the billboard in pixels.
* When undefined, the native width is used.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
width : createPropertyDescriptor('width'),
/**
* Gets or sets the numeric Property specifying the height of the billboard in pixels.
* When undefined, the native height is used.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
height : createPropertyDescriptor('height'),
/**
* Gets or sets {@link NearFarScalar} Property specifying the scale of the billboard based on the distance from the camera.
* A billboard's scale will interpolate between the {@link NearFarScalar#nearValue} and
* {@link NearFarScalar#farValue} while the camera distance falls within the upper and lower bounds
* of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
* Outside of these ranges the billboard's scale remains clamped to the nearest bound.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
scaleByDistance : createPropertyDescriptor('scaleByDistance'),
/**
* Gets or sets {@link NearFarScalar} Property specifying the translucency of the billboard based on the distance from the camera.
* A billboard's translucency will interpolate between the {@link NearFarScalar#nearValue} and
* {@link NearFarScalar#farValue} while the camera distance falls within the upper and lower bounds
* of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
* Outside of these ranges the billboard's translucency remains clamped to the nearest bound.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
translucencyByDistance : createPropertyDescriptor('translucencyByDistance'),
/**
* Gets or sets {@link NearFarScalar} Property specifying the pixel offset of the billboard based on the distance from the camera.
* A billboard's pixel offset will interpolate between the {@link NearFarScalar#nearValue} and
* {@link NearFarScalar#farValue} while the camera distance falls within the upper and lower bounds
* of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
* Outside of these ranges the billboard's pixel offset remains clamped to the nearest bound.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
pixelOffsetScaleByDistance : createPropertyDescriptor('pixelOffsetScaleByDistance'),
/**
* Gets or sets the Property specifying a {@link BoundingRectangle} that defines a
* sub-region of the image to use for the billboard, rather than the entire image,
* measured in pixels from the bottom-left.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
imageSubRegion : createPropertyDescriptor('imageSubRegion'),
/**
* Gets or sets the {@link DistanceDisplayCondition} Property specifying at what distance from the camera that this billboard will be displayed.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
distanceDisplayCondition : createPropertyDescriptor('distanceDisplayCondition'),
/**
* Gets or sets the distance from the camera at which to disable the depth test to, for example, prevent clipping against terrain.
* When set to zero, the depth test is always applied. When set to Number.POSITIVE_INFINITY, the depth test is never applied.
* @memberof BillboardGraphics.prototype
* @type {Property}
*/
disableDepthTestDistance : createPropertyDescriptor('disableDepthTestDistance')
});
/**
* Duplicates this instance.
*
* @param {BillboardGraphics} [result] The object onto which to store the result.
* @returns {BillboardGraphics} The modified result parameter or a new instance if one was not provided.
*/
BillboardGraphics.prototype.clone = function(result) {
if (!defined(result)) {
return new BillboardGraphics(this);
}
result.show = this._show;
result.image = this._image;
result.scale = this._scale;
result.pixelOffset = this._pixelOffset;
result.eyeOffset = this._eyeOffset;
result.horizontalOrigin = this._horizontalOrigin;
result.verticalOrigin = this._verticalOrigin;
result.heightReference = this._heightReference;
result.color = this._color;
result.rotation = this._rotation;
result.alignedAxis = this._alignedAxis;
result.sizeInMeters = this._sizeInMeters;
result.width = this._width;
result.height = this._height;
result.scaleByDistance = this._scaleByDistance;
result.translucencyByDistance = this._translucencyByDistance;
result.pixelOffsetScaleByDistance = this._pixelOffsetScaleByDistance;
result.imageSubRegion = this._imageSubRegion;
result.distanceDisplayCondition = this._distanceDisplayCondition;
result.disableDepthTestDistance = this._disableDepthTestDistance;
return result;
};
/**
* Assigns each unassigned property on this object to the value
* of the same property on the provided source object.
*
* @param {BillboardGraphics} source The object to be merged into this object.
*/
BillboardGraphics.prototype.merge = function(source) {
//>>includeStart('debug', pragmas.debug);
if (!defined(source)) {
throw new DeveloperError('source is required.');
}
//>>includeEnd('debug');
this.show = defaultValue(this._show, source.show);
this.image = defaultValue(this._image, source.image);
this.scale = defaultValue(this._scale, source.scale);
this.pixelOffset = defaultValue(this._pixelOffset, source.pixelOffset);
this.eyeOffset = defaultValue(this._eyeOffset, source.eyeOffset);
this.horizontalOrigin = defaultValue(this._horizontalOrigin, source.horizontalOrigin);
this.verticalOrigin = defaultValue(this._verticalOrigin, source.verticalOrigin);
this.heightReference = defaultValue(this._heightReference, source.heightReference);
this.color = defaultValue(this._color, source.color);
this.rotation = defaultValue(this._rotation, source.rotation);
this.alignedAxis = defaultValue(this._alignedAxis, source.alignedAxis);
this.sizeInMeters = defaultValue(this._sizeInMeters, source.sizeInMeters);
this.width = defaultValue(this._width, source.width);
this.height = defaultValue(this._height, source.height);
this.scaleByDistance = defaultValue(this._scaleByDistance, source.scaleByDistance);
this.translucencyByDistance = defaultValue(this._translucencyByDistance, source.translucencyByDistance);
this.pixelOffsetScaleByDistance = defaultValue(this._pixelOffsetScaleByDistance, source.pixelOffsetScaleByDistance);
this.imageSubRegion = defaultValue(this._imageSubRegion, source.imageSubRegion);
this.distanceDisplayCondition = defaultValue(this._distanceDisplayCondition, source.distanceDisplayCondition);
this.disableDepthTestDistance = defaultValue(this._disableDepthTestDistance, source.disableDepthTestDistance);
};
export default BillboardGraphics;