HRESULT IApplicationGE::SetCameraParams ( [in] double lat,
[in] double lon,
[in] double alt,
[in] AltitudeModeGE altMode,
[in] double range,
[in] double tilt,
[in] double azimuth,
[in] double speed
)
Flies to the specified camera without requiring an ICameraInfoGE instance.
This is provided for performance reasons.
This is an optimized way of setting the camera rather than using SetCamera since it requires a much smaller number of COM calls.
- Parameters:
-
|
lat |
Latitude in degrees. Between -90 and 90. |
|
lon |
Longitude in degrees. Between -180 and 180. |
|
alt |
Altitude in meters. |
|
altMode |
Altitude mode that defines altitude reference origin. |
|
range |
Distance between focus point and camera in meters. |
|
tilt |
Tilt angle in degrees. Between 0 and 90. |
|
azimuth |
Azimuth angle in degrees. |
|
speed |
Speed factor to use. Overrides autopilot speed. Value must be greater than 0. If greater than or equal to 5.0, the camera will immediately be set without any transition. This mode is called 'teleport'. |
- Return values:
-
|
S_OK |
Successfully set camera. |
|
S_TELEPORTED |
Given speed is grater than or equal to 5.0, in which case application's camera was teleported to the destination view. |
|
E_INVALIDARG |
invalid argument(s) (e.g. speed is not more than zero). |
|
E_APPLICATION_UNINITIALIZED |
Google Earth is not initialized. See IsInitialized. |
|
(other) |
Appropriate error code. |
- See also:
- SetCamera, ICameraInfoGE
上面是来自google earth com api 官方文档的资料，http://earth.google.com/comapi/interfaceIApplicationGE.html#9e1c8da5b36e8687fe718f2267224103
Description
Defines a virtual camera that is associated with any element derived from Feature. The LookAt element positions the "camera" in relation to the object that is being viewed. In Google Earth, the view "flies to" this LookAt viewpoint when the user double-clicks an item in the Places panel or double-clicks an icon in the 3D viewer.
Elements Specific to LookAt
- <longitude>
- Longitude of the point the camera is looking at. Angular distance in degrees, relative to the Prime Meridian. Values west of the Meridian range from ?180 to 0 degrees. Values east of the Meridian range from 0 to 180 degrees.
- <latitude>
- Latitude of the point the camera is looking at. Degrees north or south of the Equator (0 degrees). Values range from ?90 degrees to 90 degrees.
- <altitude>
- Distance from the earth's surface, in meters. See <altitudeMode> for how this value is interpreted.
- <heading>
- Direction (that is, North, South, East, West), in degrees. Default=0 (North). (See diagram below.) Values range from 0 to 360 degrees.
- <tilt>
- Angle between the direction of the LookAt position and the normal to the surface of the earth. (See diagram below.) Values range from 0 to 90 degrees. Values for <tilt> cannot be negative. A <tilt> value of 0 degrees indicates viewing from directly above. A <tilt> value of 90 degrees indicates viewing along the horizon.
- <range> (required)
- Distance in meters from the point specified by <longitude>, <latitude>, and <altitude> to the LookAt position. (See diagram below.)
- <altitudeMode>
- Specifies how the <altitude> specified for the LookAt point is interpreted. Possible values are as follows:
- clampToGround - (default) Indicates to ignore the <altitude> specification and place the LookAt position on the ground.
- relativeToGround - Interprets the <altitude> as a value in meters above the ground.
- absolute - Interprets the <altitude> as a value in meters above sea level.
This diagram illustrates the <range>, <tilt>, and <altitude> elements:
上面的图来自KML文档，解释的比较清楚
http://code.google.com/apis/kml/documentation/kmlreference.html#lookat
|
