matlab 改变视点

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view

Viewpoint specification

Syntax

view(az,el) view([az,el]) view([x,y,z]) view(2) view(3) view(ax,...) [az,el] = view T = view

Description

The position of the viewer (the viewpoint) determines the orientationof the axes. You specify the viewpoint in terms of azimuth and elevation,or by a point in three-dimensional space.

view(az,el) and view([az,el]) setthe viewing angle for a three-dimensional plot. The azimuth,az,is the horizontal rotation about the z-axis asmeasured in degrees from the negativey-axis.Positive values indicate counterclockwise rotation of the viewpoint.el isthe vertical elevation of the viewpoint in degrees. Positive valuesof elevation correspond to moving above the object; negative valuescorrespond to moving below the object.

view([x,y,z]) sets theviewpoint to the Cartesian coordinatesx, y,and z. The magnitude of (x,y,z) isignored.

view(2) sets the defaulttwo-dimensional view,az = 0, el = 90.

view(3) sets the defaultthree-dimensional view,az = –37.5, el= 30.

view(ax,...) uses axes ax insteadof the current axes.

[az,el] = view returnsthe current azimuth and elevation.

T = view returns the current4-by-4 transformation matrix.

Remarks

Azimuth is a polar angle in thex-y plane,with positive angles indicating counterclockwise rotation of the viewpoint.Elevation is the angle above (positive angle) or below (negativeangle) thex-y plane.

This diagram illustrates the coordinatesystem. The arrows indicate positive directions.

Examples

View the object from directly overhead.

az = 0;el = 90;view(az, el);

Set the view along the y-axis,with thex-axis extendinghorizontally and thez-axisextending vertically in the figure.

view([0 0]);

Rotate the view about the z-axisby 180º.

az = 180;el = 90;view(az, el);