rasterRenderers

用于导入渲染器类的便捷模块，可用于在使用 TypeScript 开发时渲染 ImageryLayer。例如，不是像这样一次导入一个渲染器：

import FlowRenderer from "geoscene/renderers/FlowRenderer";
import ClassBreaksRenderer from "geoscene/renderers/ClassBreaksRenderer";
import UniqueValueRenderer from "geoscene/renderers/UniqueValueRenderer";
import RasterStretchRenderer from "geoscene/renderers/RasterStretchRenderer";
import RasterColormapRenderer from "geoscene/renderers/RasterColormapRenderer";
import RasterShadedReliefRenderer from "geoscene/renderers/RasterShadedReliefRenderer";
import VectorFieldRenderer from "geoscene/renderers/VectorFieldRenderer";

您可以使用此模块在一行中导入它们：

import { FlowRenderer, ClassBreaksRenderer, UniqueValueRenderer, RasterColormapRenderer, RasterStretchRenderer, RasterShadedReliefRenderer, VectorFieldRenderer } from "geoscene/rasterRenderers";

此模块还允许您在渲染器上实现类型保护，从而使代码更加智能。

import { Renderer } from "geoscene/rasterRenderers";

function logRenderer(renderer: RasterStretchRenderer): void {
 if (renderer.type == "raster-stretch") {
   // the compiler knows the renderer must be a RasterStretchRenderer
   console.log("renderer color ramp: ", renderer.colorRamp);
 }
}