用android来实现图片的绘制以及旋转缩放案例分析

在这点上Android 确实比J2ME 强大很多手机游戏开发最痛苦的是什么？？是游戏引擎的开发，但是工程师会把大部分时间浪费在对坐标上，如果写引擎的时候没有把自适应考虑周全后期会非常痛苦，现在手机屏幕分辨率是各式各样内存大小也是各式各样所以可见自适应屏幕算法有多么的重要。

package cn.m15.xys; import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Paint;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout; public class Image extends Activity {    ImageView imageView = null;     @Override    protected void onCreate(Bundle savedInstanceState) {        imageView = new ImageView(this);        setContentView(R.layout.image);        LinearLayout ll = (LinearLayout) findViewById(R.id.iamgeid);        ll.addView(imageView);        // 向左移动        Button botton0 = (Button) findViewById(R.id.buttonLeft);        botton0.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                imageView.setPosLeft();            }        });         // 向右移动        Button botton1 = (Button) findViewById(R.id.buttonRight);        botton1.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                imageView.setPosRight();            }        });        // 左旋转        Button botton2 = (Button) findViewById(R.id.buttonRotationLeft);        botton2.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                imageView.setRotationLeft();            }        });         // 右旋转        Button botton3 = (Button) findViewById(R.id.buttonRotationRight);        botton3.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                imageView.setRotationRight();            }        });         // 缩小        Button botton4 = (Button) findViewById(R.id.buttonNarrow);        botton4.setOnClickListener(new OnClickListener() {             @Override            public void onClick(View arg0) {                imageView.setNarrow();            }        });         // 放大        Button botton5 = (Button) findViewById(R.id.buttonEnlarge);        botton5.setOnClickListener(new OnClickListener() {             @Override            public void onClick(View arg0) {                imageView.setEnlarge();            }        });         super.onCreate(savedInstanceState);     }     class ImageView extends View {        Paint mPaint = null;        Bitmap bitMap = null;        Bitmap bitMapDisplay = null;        int m_posX = 120;        int m_posY = 50;        int m_bitMapWidth = 0;        int m_bitMapHeight = 0;        Matrix mMatrix = null;        float mAngle = 0.0f;        float mScale = 1f;//1为原图的大小         public ImageView(Context context) {            super(context);            mPaint = new Paint();            mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);            bitMap = BitmapFactory.decodeResource(this.getResources(),                    R.drawable.image);            bitMapDisplay = bitMap;            mMatrix = new Matrix();            // 获取图片宽高            m_bitMapWidth = bitMap.getWidth();            m_bitMapHeight = bitMap.getHeight();        }         // 向左移动        public void setPosLeft() {            m_posX -= 10;        }         // 向右移动        public void setPosRight() {            m_posX += 10;        }         // 向左旋转        public void setRotationLeft() {            mAngle--;            setAngle();        }         // 向右旋转        public void setRotationRight() {            mAngle++;            setAngle();        }         // 缩小图片        public void setNarrow() {            if (mScale > 0.5) {                mScale -= 0.1;                setScale();            }        }         // 放大图片        public void setEnlarge() {            if (mScale < 2) {                mScale += 0.1;                setScale();            }        }         // 设置缩放比例        public void setAngle() {            mMatrix.reset();            mMatrix.setRotate(mAngle);            bitMapDisplay = Bitmap.createBitmap(bitMap, 0, 0, m_bitMapWidth,                    m_bitMapHeight, mMatrix, true);        }         // 设置旋转比例        public void setScale() {            mMatrix.reset();            //float sx X轴缩放            //float sy Y轴缩放            mMatrix.postScale(mScale, mScale);            bitMapDisplay = Bitmap.createBitmap(bitMap, 0, 0, m_bitMapWidth,                    m_bitMapHeight, mMatrix, true);        }         @Override        protected void onDraw(Canvas canvas) {            super.onDraw(canvas);            canvas.drawBitmap(bitMapDisplay, m_posX, m_posY, mPaint);            invalidate();        }    }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"        android:id="@+id/iamgeid"    androidrientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >        <Button android:id="@+id/buttonLeft"            android:layout_width="fill_parent" android:layout_height="wrap_content"            android:text="图片向左移动"            />        <Button android:id="@+id/buttonRight"            android:layout_width="fill_parent" android:layout_height="wrap_content"            android:text="图片向右移动"            />        <Button android:id="@+id/buttonRotationLeft"            android:layout_width="fill_parent" android:layout_height="wrap_content"            android:text="图片左旋转"            />        <Button android:id="@+id/buttonRotationRight"            android:layout_width="fill_parent" android:layout_height="wrap_content"            android:text="图片右旋转"            />        <Button android:id="@+id/buttonNarrow"            android:layout_width="fill_parent" android:layout_height="wrap_content"            android:text="图片缩小"            />        <Button android:id="@+id/buttonEnlarge"            android:layout_width="fill_parent" android:layout_height="wrap_content"            android:text="图片放大"            /></LinearLayout>

更多相关文章

随机推荐