旋转ImageView

川长思鸟来 2022-08-22 15:27 187阅读 0赞

![这里写图片描述][20160601202141687]

![这里写图片描述][20160601202308566]

![这里写图片描述][20160601202337268]

![这里写图片描述][20160601202359394]

package aurobot.interjoy.com.angleimageview;
    
    import android.app.Activity;
    import android.content.BroadcastReceiver;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Canvas;
    import android.graphics.Paint;
    import android.os.Bundle;
    import android.util.DisplayMetrics;
    import android.util.Log;
    import android.view.Display;
    import android.view.Window;
    import android.widget.ImageView;
    
    public class XuanZhuanActivity extends Activity { 
        private ImageView iv_avoid;
        private int[] num = {
       0, 0, 0, 0, 0};//方位预警数据，0代表安全，为白色雷达，1代表危险，为红色雷达
        private int[] angles = {-45, 45, -135, 180, 135};//雷达图标分别需要旋转的角度
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.activity_xuan_zhuan);
            iv_avoid = (ImageView) findViewById(R.id.myIV);
            mergeBitmap(getBitmaps(num));
        }
    
        /** * 根据方位预警数据数组 返回对应颜色雷达图标的数组 * * @param info 方位预警数据数组 * @return */
        private Bitmap[] getBitmaps(int[] info) {
            Bitmap[] lines = new Bitmap[info.length];
            for (int i = 0; i < info.length; i++) {
                if (1 == info[i]) {
                    lines[i] = BitmapFactory.decodeResource(getResources(), R.drawable.red_line);
                } else if (0 == info[0]) {
                    lines[i] = BitmapFactory.decodeResource(getResources(), R.drawable.white_line);
                }
            }
            return lines;
        }
    
        /** * 绘制图片 * * @param bitmaps 雷达图标的数组 */
        private void mergeBitmap(Bitmap[] bitmaps) {
            //兔子图片对象
            Bitmap rabitRes = BitmapFactory.decodeResource(getResources(), R.drawable.rabit_line);
            //获取屏幕宽高做适配
            Display defaultDisplay = getWindowManager().getDefaultDisplay();
            DisplayMetrics metrics = new DisplayMetrics();
            defaultDisplay.getMetrics(metrics);
            int height = metrics.heightPixels;//此界面是横屏，所以高度为720或者1080
    
            float canvasW_H = height * 200 / 720;//画布宽高(720屏幕中是200)
            float centerX = canvasW_H / 2;//雷达的旋转中心X坐标（100,100）
            float centerY = canvasW_H / 2;//雷达的旋转中心Y坐标
            float startX = canvasW_H * 55 / 200;//画雷达的起始位置X坐标(55,0)
            Log.d("@@@", "startX==" + startX);
            float startY = 0.0f;//画雷达的起始位置Y坐标
            float rabitX = startX;//画兔子起始位置X坐标(55,55)
            float rabitY = rabitX;//画兔子起始位置Y坐标
    
            //新建画笔，为了画圆形背景
            float radius = centerX;//半径 100，等值于，圆心XY坐标
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            paint.setARGB(76, 0, 0, 0);//透明度30% 0-255， 0是完全透明
            paint.setStrokeWidth(radius);//设置画笔宽度 为圆的半径，即实心圆
    
            //新建画布
            Bitmap bitmap2 = Bitmap.createBitmap((int) canvasW_H, (int) canvasW_H, bitmaps[0].getConfig());
    // Bitmap bitmap2 = Bitmap.createBitmap((int) canvasW_H, (int) canvasW_H, Bitmap.Config.RGB_565);
            Canvas canvas = new Canvas(bitmap2);
            canvas.drawCircle(centerX, centerY, radius, paint);//画圆
            //绘制各个方向的雷达
            for (int i = 0; i < bitmaps.length; i++) {
                canvas.save();
                canvas.rotate(angles[i], centerX, centerY);
                canvas.drawBitmap(bitmaps[i], startX, startY, null);
                canvas.restore();
            }
            //绘制中心兔子
            canvas.drawBitmap(rabitRes, rabitX, rabitY, null);
            Log.d("@@@", "rabitX==" + rabitX);
            iv_avoid.setImageBitmap(bitmap2);
        }
    }

[20160601202141687]: /images/20220722/1299941dbd054153ad26345d0ae00b2b.png
[20160601202308566]: /images/20220722/72f3e6015829452f9f65412d0c953c20.png
[20160601202337268]: /images/20220722/12dcd81c2c7d4356a573ace5c9c9d886.png
[20160601202359394]: /images/20220722/200f02bea9d9441c9f0d9c90f74606c5.png