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128 lines
2.9 KiB
JavaScript
128 lines
2.9 KiB
JavaScript
import { Camera } from './Camera';
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import { Object3D } from '../core/Object3D';
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/**
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* @author alteredq / http://alteredqualia.com/
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* @author arose / http://github.com/arose
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*/
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function OrthographicCamera( left, right, top, bottom, near, far ) {
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Camera.call( this );
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this.type = 'OrthographicCamera';
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this.zoom = 1;
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this.view = null;
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this.left = left;
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this.right = right;
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this.top = top;
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this.bottom = bottom;
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this.near = ( near !== undefined ) ? near : 0.1;
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this.far = ( far !== undefined ) ? far : 2000;
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this.updateProjectionMatrix();
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}
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OrthographicCamera.prototype = Object.assign( Object.create( Camera.prototype ), {
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constructor: OrthographicCamera,
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isOrthographicCamera: true,
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copy: function ( source ) {
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Camera.prototype.copy.call( this, source );
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this.left = source.left;
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this.right = source.right;
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this.top = source.top;
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this.bottom = source.bottom;
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this.near = source.near;
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this.far = source.far;
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this.zoom = source.zoom;
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this.view = source.view === null ? null : Object.assign( {}, source.view );
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return this;
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},
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setViewOffset: function( fullWidth, fullHeight, x, y, width, height ) {
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this.view = {
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fullWidth: fullWidth,
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fullHeight: fullHeight,
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offsetX: x,
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offsetY: y,
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width: width,
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height: height
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};
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this.updateProjectionMatrix();
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},
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clearViewOffset: function() {
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this.view = null;
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this.updateProjectionMatrix();
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},
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updateProjectionMatrix: function () {
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var dx = ( this.right - this.left ) / ( 2 * this.zoom );
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var dy = ( this.top - this.bottom ) / ( 2 * this.zoom );
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var cx = ( this.right + this.left ) / 2;
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var cy = ( this.top + this.bottom ) / 2;
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var left = cx - dx;
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var right = cx + dx;
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var top = cy + dy;
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var bottom = cy - dy;
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if ( this.view !== null ) {
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var zoomW = this.zoom / ( this.view.width / this.view.fullWidth );
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var zoomH = this.zoom / ( this.view.height / this.view.fullHeight );
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var scaleW = ( this.right - this.left ) / this.view.width;
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var scaleH = ( this.top - this.bottom ) / this.view.height;
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left += scaleW * ( this.view.offsetX / zoomW );
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right = left + scaleW * ( this.view.width / zoomW );
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top -= scaleH * ( this.view.offsetY / zoomH );
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bottom = top - scaleH * ( this.view.height / zoomH );
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}
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this.projectionMatrix.makeOrthographic( left, right, top, bottom, this.near, this.far );
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},
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toJSON: function ( meta ) {
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var data = Object3D.prototype.toJSON.call( this, meta );
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data.object.zoom = this.zoom;
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data.object.left = this.left;
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data.object.right = this.right;
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data.object.top = this.top;
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data.object.bottom = this.bottom;
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data.object.near = this.near;
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data.object.far = this.far;
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if ( this.view !== null ) data.object.view = Object.assign( {}, this.view );
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return data;
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}
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} );
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export { OrthographicCamera };
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