public final class VisionPoint

Object
VisionPoint

Immutable point in a normalized, top-left-origin coordinate space. X grows right and Y grows down; 0 and 1 correspond to image edges, independent of source pixel dimensions.

toPoint(int, int, int, int) converts one back to pixels for drawing:

public void paint(Graphics g) {
    super.paint(g);
    g.setColor(0xff3b30);
    for (Face face : lastFaces) {
        VisionPoint eye = face.getLandmark(FaceLandmarks.LEFT_EYE);
        if (eye != null) {
            Point p = eye.toPoint(this);
            g.fillArc(p.getX() - 8, p.getY() - 8, 16, 16, 0, 360);
        }
    }
}

Constructors

public VisionPoint(float x, float y) Creates a point in the oriented input image’s top-left coordinate space.

Methods

`public float getX()`
`public float getY()`
`public` `Point toPoint(int x, int y, int width, int height)`	Maps this normalized point onto a pixel rectangle.
`public` `Point toPoint(Component target)`	Maps this normalized point onto a component’s absolute on-screen bounds, which is the coordinate space a `paint` method draws in.

Inherited methods

From Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait, clone

Constructor details

VisionPoint

public VisionPoint(float x, float y)

Creates a point in the oriented input image’s top-left coordinate space.

Parameters

x float: horizontal coordinate
y float: vertical coordinate

Method details

getX

public float getX()

Returns

horizontal coordinate normalized to the oriented input width

getY

public float getY()

Returns

downward vertical coordinate normalized to input height

toPoint

public Point toPoint(int x, int y, int width, int height)

Maps this normalized point onto a pixel rectangle.

The mapping stretches the whole 0..1 range across width and height. That is correct when the destination has the same aspect ratio as the analyzed image, which is the usual case for an image drawn to fit. A live preview scaled with ScaleType.CROP does not: pass the rectangle the frame actually occupies rather than the component’s own bounds.

Parameters

x int: left edge of the destination rectangle in pixels
y int: top edge of the destination rectangle in pixels
width int: destination width in pixels
height int: destination height in pixels

Returns

the corresponding pixel position, rounded to the nearest pixel

toPoint

public Point toPoint(Component target)

Maps this normalized point onto a component’s absolute on-screen bounds, which is the coordinate space a paint method draws in.

Parameters

target Component: component the analyzed image is displayed in

Returns

the corresponding absolute pixel position

Throws

NullPointerException: if target is null