ViewportQuad
查阅Mars3D API

new Cesium.ViewportQuad(rectangle, material)
engine/Source/Scene/ViewportQuad.js 26

A viewport aligned quad.
参数名称 类型 描述信息
rectangle BoundingRectangle 可选 The BoundingRectangle defining the quad's position within the viewport.
material Material 可选 The Material defining the surface appearance of the viewport quad.
使用示例:
const viewportQuad = new Cesium.ViewportQuad(new Cesium.BoundingRectangle(0, 0, 80, 40));
viewportQuad.material.uniforms.color = new Cesium.Color(1.0, 0.0, 0.0, 1.0);

成员(属性)

material : Material
engine/Source/Scene/ViewportQuad.js 73

The surface appearance of the viewport quad. This can be one of several built-in Material objects or a custom material, scripted with Fabric.

The default material is Material.ColorType.

使用示例:
// 1. Change the color of the default material to yellow
viewportQuad.material.uniforms.color = new Cesium.Color(1.0, 1.0, 0.0, 1.0);

// 2. Change material to horizontal stripes
viewportQuad.material = Cesium.Material.fromType(Cesium.Material.StripeType);
参考:

rectangle : BoundingRectangle
engine/Source/Scene/ViewportQuad.js 47

The BoundingRectangle defining the quad's position within the viewport.
使用示例:
viewportQuad.rectangle = new Cesium.BoundingRectangle(0, 0, 80, 40);

show : boolean
engine/Source/Scene/ViewportQuad.js 33

Determines if the viewport quad primitive will be shown.
默认值: true

方法

destroy()
engine/Source/Scene/ViewportQuad.js 174

Destroys the WebGL resources held by this object. Destroying an object allows for deterministic release of WebGL resources, instead of relying on the garbage collector to destroy this object.

Once an object is destroyed, it should not be used; calling any function other than isDestroyed will result in a DeveloperError exception. Therefore, assign the return value (undefined) to the object as done in the example.
Throws:
  • DeveloperError : This object was destroyed, i.e., destroy() was called.
使用示例:
quad = quad && quad.destroy();
参考:

isDestroyed() → boolean
engine/Source/Scene/ViewportQuad.js 154

Returns true if this object was destroyed; otherwise, false.

If this object was destroyed, it should not be used; calling any function other than isDestroyed will result in a DeveloperError exception.
返回值:
True if this object was destroyed; otherwise, false.
参考:

update()
engine/Source/Scene/ViewportQuad.js 91

Called when Viewer or CesiumWidget render the scene to get the draw commands needed to render this primitive.

Do not call this function directly. This is documented just to list the exceptions that may be propagated when the scene is rendered:

Throws:
packages/engine
packages/widgets