@itwin/core-frontend
Version:
iTwin.js frontend components
67 lines • 2.46 kB
JavaScript
/*---------------------------------------------------------------------------------------------
* Copyright (c) Bentley Systems, Incorporated. All rights reserved.
* See LICENSE.md in the project root for license terms and full copyright notice.
*--------------------------------------------------------------------------------------------*/
/** @packageDocumentation
* @module WebGL
*/
import { assert } from "@itwin/core-bentley";
import { Transform } from "@itwin/core-geometry";
import { ViewFlags } from "@itwin/core-common";
import { FeatureSymbology } from "../../../render/FeatureSymbology";
import { BranchState } from "./BranchState";
import { EdgeSettings } from "./EdgeSettings";
/**
* Represents the current state of the scene graph. As the scene graph is traversed,
* branch states are pushed and popped. Pushing a branch state replaces the current view flags
* and multiplies the current transform with the branch's transform. Popping it inverts this
* operation. The state at the top of the stack applies to the rendering of all primitives.
* The stack does not store the scene graph itself.
* @internal
*/
export class BranchStack {
_stack = [];
constructor() {
const state = new BranchState({
viewFlags: new ViewFlags(),
transform: Transform.createIdentity(),
edgeSettings: EdgeSettings.create(undefined),
contourLine: undefined,
is3d: true,
symbologyOverrides: new FeatureSymbology.Overrides(),
});
this.pushState(state);
}
get top() {
assert(!this.empty);
return this._stack[this._stack.length - 1];
}
get bottom() {
assert(!this.empty);
return this._stack[0];
}
get length() { return this._stack.length; }
get empty() { return 0 === this.length; }
pushBranch(branch) {
assert(this.length > 0);
this.pushState(BranchState.fromBranch(this.top, branch));
}
pushState(state) {
this._stack.push(state);
}
pop() {
assert(!this.empty);
if (!this.empty) {
this._stack.pop();
}
}
changeRenderPlan(vf, is3d, hline, contour) {
assert(1 === this.length);
this.top.changeRenderPlan(vf, is3d, hline, contour);
}
setSymbologyOverrides(ovrs) {
assert(1 === this.length);
this.top.symbologyOverrides = ovrs;
}
}
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