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RectUtils.javaAPI DocAndroid 5.1 API3033Thu Mar 12 22:22:50 GMT 2015com.android.bitmap.util

RectUtils

public class RectUtils extends Object

Fields Summary
Constructors Summary
Methods Summary
public static voidrotateRect(int degrees, int px, int py, android.graphics.Rect rect)

        final RectF rectF = new RectF(rect);
        final Matrix matrix = new Matrix();
        matrix.setRotate(degrees, px, py);
        matrix.mapRect(rectF);
        rect.set((int) rectF.left, (int) rectF.top, (int) rectF.right, (int) rectF.bottom);
public static voidrotateRectForOrientation(int orientation, android.graphics.Rect fullRect, android.graphics.Rect partialRect)
Transform the upright full rectangle so that it bounds the original rotated image, given by the orientation. Transform the upright partial rectangle such that it would apply to the same region of the transformed full rectangle. The top-left of the transformed full rectangle will always be placed at (0, 0).

param
orientation The exif orientation (0, 90, 180, 270) of the original image. The transformed full and partial rectangles will be in this orientation's coordinate space.
param
fullRect The upright full rectangle. This rectangle will be modified.
param
partialRect The upright partial rectangle. This rectangle will be modified.

        final Matrix matrix = new Matrix();
        // Exif orientation specifies how the camera is rotated relative to the actual subject.
        // First rotate in the opposite direction.
        matrix.setRotate(-orientation);
        final RectF fullRectF = new RectF(fullRect);
        final RectF partialRectF = new RectF(partialRect);
        matrix.mapRect(fullRectF);
        matrix.mapRect(partialRectF);
        // Then translate so that the upper left corner of the rotated full rect is at (0,0).
        matrix.reset();
        matrix.setTranslate(-fullRectF.left, -fullRectF.top);
        matrix.mapRect(fullRectF);
        matrix.mapRect(partialRectF);
        // Orientation transformation is complete.
        fullRect.set((int) fullRectF.left, (int) fullRectF.top, (int) fullRectF.right,
                (int) fullRectF.bottom);
        partialRect.set((int) partialRectF.left, (int) partialRectF.top, (int) partialRectF.right,
                (int) partialRectF.bottom);