Android 倒车影像车道线，3D效果

Android 倒车影像车道线

1、直接上代码

public class LaneLineView extends View {
   
    private Paint paint;
    private Camera camera;
    private Matrix matrix;

    //尺度标记得长短，可调整
    private int tran = 200;
    //笔粗细，由近到远是由粗到细，变化跟倾斜得角度有关，可调整
    private int strokeWidth = 70;


    public LaneLineView(Context context) {
   
        super(context);
        init();
    }

    public LaneLineView(Context context, @Nullable AttributeSet attrs) {
   
        super(context, attrs);
        init();
    }

    private void init(){
   
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        paint.setStrokeWidth(strokeWidth);

        //矩阵变化所需要的东西
        camera = new Camera();
        matrix = new Matrix();
    }
}

2、然后开始画线，重写onDraw方法

    @Override
    protected void onDraw(Canvas canvas) {
   
        super.onDraw(canvas);
        
        nt height = getHeight();
        int width = getWidth();
        //每个刻度之间的长度，可调整
        int h_coefficient = 1000;
        //左右边界距离，可调整
        int w_coefficient = width / 6;
        //可适当调整俩条线之间的角度
        int skewing = 300;

        //计算画布旋转角度
        double v = Math.sqrt(Math.pow(h_coefficient, 2) - Math.pow(skewing, 2));
        double angle