96 lines
3.2 KiB
Java
96 lines
3.2 KiB
Java
package com.aoleyun.sn.view;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.PointF;
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import android.util.AttributeSet;
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import android.view.View;
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import androidx.annotation.Nullable;
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import java.util.Locale;
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public class FaceOverlayView extends View {
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private Paint pointPaint;
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private Paint textPaint;
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private PointF leftEye;
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private PointF rightEye;
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private double distance;
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private int imageWidth;
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private int imageHeight;
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public FaceOverlayView(Context context) {
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super(context);
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init();
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}
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public FaceOverlayView(Context context, @Nullable AttributeSet attrs) {
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super(context, attrs);
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init();
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}
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private void init() {
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pointPaint = new Paint();
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pointPaint.setColor(Color.RED);
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pointPaint.setStyle(Paint.Style.FILL);
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pointPaint.setStrokeWidth(10f);
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textPaint = new Paint();
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textPaint.setColor(Color.YELLOW);
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textPaint.setTextSize(60f);
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textPaint.setFakeBoldText(true);
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textPaint.setShadowLayer(5, 0, 0, Color.BLACK);
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}
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public void updateData(double distance, PointF leftEye, PointF rightEye, int imageWidth, int imageHeight) {
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this.distance = distance;
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this.leftEye = leftEye;
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this.rightEye = rightEye;
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this.imageWidth = imageWidth;
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this.imageHeight = imageHeight;
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postInvalidate();
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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if (leftEye == null || rightEye == null || imageWidth <= 0 || imageHeight <= 0) {
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canvas.drawText("未检测到人脸", 50, 100, textPaint);
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return;
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}
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// 1. 获取 View 的尺寸
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float viewWidth = getWidth();
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float viewHeight = getHeight();
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// 2. 计算缩放比例 (适配 PreviewView 的 FILL_CENTER 逻辑)
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// FILL_CENTER：取宽高缩放比例中较大的一个，使图像填满 View 且不拉伸，多出的部分被裁剪
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float scale = Math.max(viewWidth / imageWidth, viewHeight / imageHeight);
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// 3. 计算偏移量（由居中裁剪产生）
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float postScaleWidth = imageWidth * scale;
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float postScaleHeight = imageHeight * scale;
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float offsetX = (viewWidth - postScaleWidth) / 2f;
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float offsetY = (viewHeight - postScaleHeight) / 2f;
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// 4. 坐标映射并处理镜像
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// CameraX 的 PreviewView 显示前置摄像头时默认是镜像的
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// 映射公式： viewX = viewWidth - (imageX * scale + offsetX)
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float lx = viewWidth - (leftEye.x * scale + offsetX);
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float ly = leftEye.y * scale + offsetY;
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float rx = viewWidth - (rightEye.x * scale + offsetX);
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float ry = rightEye.y * scale + offsetY;
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// 绘制眼睛点位
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canvas.drawCircle(lx, ly, 15, pointPaint);
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canvas.drawCircle(rx, ry, 15, pointPaint);
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// 绘制连线，更直观
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canvas.drawLine(lx, ly, rx, ry, pointPaint);
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canvas.drawText(String.format(Locale.getDefault(), "瞳距: %.2f", distance), 50, 100, textPaint);
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}
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}
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