@visactor/vrender-core/es/render/render-service.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { DefaultDrawContribution } from "./contributions/render/draw-contribution";

export class DefaultRenderService {
    constructor(drawContribution = new DefaultDrawContribution) {
        this.drawContribution = drawContribution;
    }
    prepare(updateBounds) {
        updateBounds && this.renderTreeRoots.forEach((g => {
            this._prepare(g, updateBounds);
        }));
    }
    _prepare(g, updateBounds) {
        g.forEachChildren((g => {
            this._prepare(g, updateBounds);
        })), g.update({
            bounds: updateBounds,
            trans: !0
        });
    }
    prepareRenderList() {}
    beforeDraw(params) {}
    draw(params) {
        this.drawContribution.draw(this, Object.assign({}, this.drawParams));
    }
    afterDraw(params) {
        this.drawContribution.afterDraw && this.drawContribution.afterDraw(this, Object.assign({}, this.drawParams));
    }
    reInit() {
        this.drawContribution.reInit();
    }
    render(groups, params) {
        this.renderTreeRoots = groups, this.drawParams = params;
        const updateBounds = params.updateBounds;
        this.prepare(updateBounds), this.prepareRenderList(), this.beforeDraw(params), this.draw(params), 
        this.afterDraw(params), this.drawParams = null;
    }
}
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