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MaterialProperty.js
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MaterialProperty.js
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import Color from '../Core/Color.js';
import defined from '../Core/defined.js';
import defineProperties from '../Core/defineProperties.js';
import DeveloperError from '../Core/DeveloperError.js';
import Material from '../Scene/Material.js';
/**
* The interface for all {@link Property} objects that represent {@link Material} uniforms.
* This type defines an interface and cannot be instantiated directly.
*
* @alias MaterialProperty
* @constructor
* @abstract
*
* @see ColorMaterialProperty
* @see CompositeMaterialProperty
* @see GridMaterialProperty
* @see ImageMaterialProperty
* @see PolylineGlowMaterialProperty
* @see PolylineOutlineMaterialProperty
* @see StripeMaterialProperty
*/
function MaterialProperty() {
DeveloperError.throwInstantiationError();
}
defineProperties(MaterialProperty.prototype, {
/**
* Gets a value indicating if this property is constant. A property is considered
* constant if getValue always returns the same result for the current definition.
* @memberof MaterialProperty.prototype
*
* @type {Boolean}
* @readonly
*/
isConstant : {
get : DeveloperError.throwInstantiationError
},
/**
* Gets the event that is raised whenever the definition of this property changes.
* The definition is considered to have changed if a call to getValue would return
* a different result for the same time.
* @memberof MaterialProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged : {
get : DeveloperError.throwInstantiationError
}
});
/**
* Gets the {@link Material} type at the provided time.
* @function
*
* @param {JulianDate} time The time for which to retrieve the type.
* @returns {String} The type of material.
*/
MaterialProperty.prototype.getType = DeveloperError.throwInstantiationError;
/**
* Gets the value of the property at the provided time.
* @function
*
* @param {JulianDate} time The time for which to retrieve the value.
* @param {Object} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {Object} The modified result parameter or a new instance if the result parameter was not supplied.
*/
MaterialProperty.prototype.getValue = DeveloperError.throwInstantiationError;
/**
* Compares this property to the provided property and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
* @function
*
* @param {Property} [other] The other property.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
MaterialProperty.prototype.equals = DeveloperError.throwInstantiationError;
/**
* @private
*/
MaterialProperty.getValue = function(time, materialProperty, material) {
var type;
if (defined(materialProperty)) {
type = materialProperty.getType(time);
if (defined(type)) {
if (!defined(material) || (material.type !== type)) {
material = Material.fromType(type);
}
materialProperty.getValue(time, material.uniforms);
return material;
}
}
if (!defined(material) || (material.type !== Material.ColorType)) {
material = Material.fromType(Material.ColorType);
}
Color.clone(Color.WHITE, material.uniforms.color);
return material;
};
export default MaterialProperty;