一渲染
第一種情況——位圖渲染
package com.example.paintgaojishiyong.render;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/11/27 20:06
* @note 渲染
*/
public class MyGradientView extends View {
private Bitmap mBitmap;
private Paint mPaint;
private int width;
private int height;
public MyGradientView(Context context) {
super(context);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mBitmap = ((BitmapDrawable)getResources().getDrawable(R.drawable.xyjy2)).getBitmap();
mPaint = new Paint();
width = mBitmap.getWidth();
height = mBitmap.getHeight();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.GREEN);
/**
* TileMode.CLAMP 拉伸最後一個像素去鋪滿剩下的地方
* TileMode.MIRROR 通過鏡像翻轉鋪滿剩下的地方。
* TileMode.REPEAT 重複圖片平鋪整個畫面(電腦設置壁紙)
* 在圖片和顯示區域大小不符的情況進行擴充渲染
*/
/**
* 位圖渲染,BitmapShader(@NonNull Bitmap bitmap, @NonNull TileMode tileX, @NonNull TileMode tileY)
* Bitmap:構造shader使用的bitmap
* tileX:X軸方向的TileMode
* tileY:Y軸方向的TileMode
*/
BitmapShader bitmapShader = new BitmapShader(mBitmap, Shader.TileMode.REPEAT,Shader.TileMode.MIRROR);
mPaint.setShader(bitmapShader);
mPaint.setAntiAlias(true);
canvas.drawRect(new Rect(0,0,1000,1600),mPaint);
}
}
MainActivity中的設置
package com.example.paintgaojishiyong;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import com.example.paintgaojishiyong.render.MyGradientView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new MyGradientView(this));
}
}
其中的一種效果
第二種情況——線性渲染
package com.example.paintgaojishiyong.render;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/11/27 20:06
* @note 渲染
*/
public class MyGradientView extends View {
private Bitmap mBitmap;
private Paint mPaint;
private int[] colors = new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW};
public MyGradientView(Context context) {
super(context);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mBitmap = ((BitmapDrawable)getResources().getDrawable(R.drawable.xyjy2)).getBitmap();
mPaint = new Paint();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.WHITE);
/**線性渲染
* x0, y0, 起始點
* x1, y1, 結束點
* int[] mColors, 中間依次要出現的幾個顏色
* float[] positions 位置數組,position的取值範圍[0,1],作用是指定幾個顏色分別放置在那個位置上,
* 如果傳null,漸變就線性變化。
* tile 用於指定控件區域大於指定的漸變區域時,空白區域的顏色填充方法
*/
LinearGradient linearGradient = new LinearGradient(0,0,800,800,colors,new float[]{0.25f,0.5f,0.75f,0.9f},Shader.TileMode.MIRROR);
mPaint.setShader(linearGradient);
canvas.drawRect(0,0,800,800,mPaint);
}
}
我們看下效果
例子:跑馬燈效果
package com.dn_alan.myapplication.render;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.util.AttributeSet;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatTextView;
/**
* 線性渲染
*/
public class LinearGradientTextView extends AppCompatTextView {
private LinearGradient mLinearGradient;
private Matrix mGradientMatrix;
private Paint mPaint;
private int mViewWidth = 0;
private int mTranslate = 0;
private int delta = 15;
public LinearGradientTextView(Context context) {
super(context);
}
public LinearGradientTextView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
// 控件大小發生改變時調用,初始化只會被調用一次
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (mViewWidth == 0) {
//得到控件的寬度
mViewWidth = getMeasuredWidth();
//大於0表示TextView有內容。
if (mViewWidth > 0) {
//TextView中獲取畫筆
mPaint = getPaint();
//獲取文字長度
String text = getText().toString();
//下面就是計算高亮文字的大小是多少。
int size;
if (text.length() > 0) {
//mViewWidth除字體總數就得到了每個字的像素 然後*3 表示3個文字的像素
size = mViewWidth / text.length() * 3;
} else {
size = mViewWidth;
}
// 從左邊-size開始,左邊看不見的地方開始,滾動掃描過來
mLinearGradient = new LinearGradient(-size, 0, 0, 0,
new int[]{0x33ffffff, 0xffffffff, 0x33ffffff},
new float[]{0, 0.2f, 1}, Shader.TileMode.CLAMP); //邊緣融合
mPaint.setShader(mLinearGradient);`在這裏插入代碼片`
mGradientMatrix = new Matrix();
}
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//getTextBounds() 還可以獲得高度信息,因爲其使用一個 Rect 對象對寬高信息進行存儲;而measureText() 則只是返回寬度信息。
float mTextWidth = getPaint().measureText(getText().toString());
mTranslate += delta;
/**
* 如果位置已經移動到了整方了那個文字的地就開始往回滾動。
* 但是如果小於1 了那麼又開始遞增,走另外一個邏輯
*/
if (mTranslate > mTextWidth + 1 || mTranslate < 1) {
delta = -delta;
}
mGradientMatrix.setTranslate(mTranslate, 0);
mLinearGradient.setLocalMatrix(mGradientMatrix);
//paint是textview的所以只需要不斷色控制畫筆的shader 然後利用矩陣控制位移即可
postInvalidateDelayed(30);
}
}
佈局文件
<com.dn_alan.myapplication.render.LinearGradientTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textColor="#666666"
android:text="歡迎同學們來到動腦學院高級UI"/>
第三種情況,掃描渲染
package com.example.gaojiui;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
public class MyGradientView extends View {
private int[] colors = new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW};
private Paint paint;
public MyGradientView(Context context) {
super(context);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 第一、二個參數:漸變中心座標
* 第三個參數:漸變開始和結束的顏色
* 最後一個參數爲null時候,根據顏色線性漸變
*/
SweepGradient sweepGradient = new SweepGradient(200,200,colors,new float[]{0,0.5f,0.6f,0.9f});
paint.setShader(sweepGradient);
canvas.drawCircle(200,200,200,paint);
}
}
例子不斷旋轉掃描
package com.dn_alan.myapplication.render;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import androidx.annotation.Nullable;
/**
* 漸變渲染/梯度渲染
*/
public class RadarGradientView extends View {
private int mWidth, mHeight;
//五個圓
private float[] pots = {0.05f, 0.1f, 0.15f, 0.2f, 0.25f};
private Shader scanShader; // 掃描渲染shader
private Matrix matrix = new Matrix(); // 旋轉需要的矩陣
private int scanSpeed = 5; // 掃描速度
private int scanAngle; // 掃描旋轉的角度
private Paint mPaintCircle; // 畫圓用到的paint
private Paint mPaintRadar; // 掃描用到的paint
public RadarGradientView(Context context) {
super(context);
// 畫圓用到的paint
mPaintCircle = new Paint();
mPaintCircle.setStyle(Paint.Style.STROKE); // 描邊
mPaintCircle.setStrokeWidth(1); // 寬度
mPaintCircle.setAlpha(100); // 透明度
mPaintCircle.setAntiAlias(true); // 抗鋸齒
mPaintCircle.setColor(Color.parseColor("#ff0000")); // 設置紅色
// 掃描用到的paint
mPaintRadar = new Paint();
mPaintRadar.setStyle(Paint.Style.FILL_AND_STROKE); // 填充
mPaintRadar.setAntiAlias(true); // 抗鋸齒
post(run);
}
public RadarGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public RadarGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// 取屏幕的寬高是爲了把雷達放在屏幕的中間
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
mWidth = mHeight = Math.min(mWidth, mHeight);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//畫圈圈
for (int i = 0; i < pots.length; i++) {
canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * pots[i], mPaintCircle);
}
// 畫布的旋轉變換 需要調用save() 和 restore()
canvas.save();
//顏色漸變從透明到綠色
scanShader = new SweepGradient(mWidth / 2, mHeight / 2,
new int[]{Color.TRANSPARENT, Color.parseColor("#00ff00")}, null);
mPaintRadar.setShader(scanShader); // 設置着色器
/**
* 1,canvas.concat的作用可以理解成對matrix的變換應用到canvas上的所有對象.
* 2,在自定義View的時候,我們經常會用到Canvas進行繪製,其中也會用到Matrix對圖像進行移動、旋轉等操作,
* 這個時候就會涉及到concat和setMatrix這兩個方法,將Matrix的變化效果設置到Canvas上
* 3,setMatrix作用的是當前的畫布,而concat作用的是畫布上的組件。具體講的詳細一點的話,如果我對matrix放大兩倍,使用setMatrix的話,
* 相當於整個座標軸放大了兩倍,而繪製的參數並沒有改變。因爲canvas的原點並沒有在左上角,導致實際上會有偏差。
* 而concat改變的是繪製的參數,200變400,100變200,而座標軸不變,所以整體上就當好是兩倍的效果。
*/
canvas.concat(matrix);
canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * pots[4], mPaintRadar);
canvas.restore();
}
private Runnable run = new Runnable() {
@Override
public void run() {
scanAngle = (scanAngle + scanSpeed) % 360; // 旋轉角度 對360取餘,保證旋轉角度在360以內
/**
* setRotate : 使用的是setRotate()方法對指針圖片進行旋轉操作,再用了setTranslate()方法進行平移操作,則之前的旋轉效果就沒有 了,只有平移效果
* 原因:Matrix方法中的setRotate()方法會先清除該矩陣,之後設置旋轉操作的,同樣,setTranslate()等方法也是一樣的。所以各種效果 是不能疊加在一起的
* postRotate :可以實現多種效果同時使用
*/
matrix.postRotate(scanSpeed, mWidth / 2, mHeight / 2); // 旋轉矩陣
invalidate(); // 通知view重繪
postDelayed(run, 50); // 調用自身 重複繪製
}
};
}
第四種情況:環形渲染
package com.example.gaojiui;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
public class MyGradientView extends View {
private int[] colors = new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW};
private Paint paint;
public MyGradientView(Context context) {
super(context);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 環形渲染
* centerX ,centerY:shader的中心座標,開始漸變的座標
* radius:漸變的半徑
* centerColor,edgeColor:中心點漸變顏色,邊界的漸變顏色
* colors:漸變顏色數組
* stops:漸變位置數組,類似掃描漸變的positions數組,取值[0,1],中心點爲0,半徑到達位置爲1.0f
* tileMode:shader未覆蓋以外的填充模式
*/
RadialGradient radialGradient = new RadialGradient(300,300,100,colors,null, Shader.TileMode.REPEAT);
paint.setShader(radialGradient);
canvas.drawCircle(300,300,300,paint);
}
}
看下效果
例子:手指點擊出現波紋效果
package com.example.gaojiui;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import androidx.annotation.Nullable;
public class MyGradientView extends View {
private Shader radialGradient;
private Paint paint;
private int x;
private int y;
private int radious;
public MyGradientView(Context context) {
super(context);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
int width = getMeasuredWidth();
int height = getMeasuredHeight();
radious = Math.max(width,height);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.BLUE);
if(radialGradient!=null){
paint.setShader(radialGradient);
canvas.drawCircle(x,y,radious,paint);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//蛇者alpha通道(透明度)
x = (int) event.getX();
y = (int) event.getY();
paint.setAlpha(400);
radialGradient = new RadialGradient(event.getX(),event.getY(),48,new int[]{Color.WHITE,Color.TRANSPARENT},
null,Shader.TileMode.REPEAT);
postInvalidate();
return true;
}
}
第五種情況組合模式
package com.example.paintgaojishiyong.render;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposeShader;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/11/27 20:06
* @note 渲染
*/
public class MyGradientView extends View {
private int width;
private int height;
private Paint paint;
public MyGradientView(Context context) {
super(context);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width = getMeasuredWidth();
height = getMeasuredHeight();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 組合渲染,
* ComposeShader(@NonNull Shader shaderA, @NonNull Shader shaderB, Xfermode mode)
* ComposeShader(@NonNull Shader shaderA, @NonNull Shader shaderB, PorterDuff.Mode mode)
* shaderA,shaderB:要混合的兩種shader
* Xfermode mode: 組合兩種shader顏色的模式
* PorterDuff.Mode mode: 組合兩種shader顏色的模式
*/
/*ComposeShader mComposeShader = new ComposeShader(linearGradient, mBitmapShader, PorterDuff.Mode.SRC_OVER);
mPaint.setShader(mComposeShader);
canvas.drawRect(0, 0, 800, 1000, mPaint);*/
/***************用ComposeShader即可實現心形圖漸變效果*********************************/
//創建BitmapShader,用以繪製心
Bitmap mBitmap = ((BitmapDrawable)getResources().getDrawable(R.drawable.heart)).getBitmap();
BitmapShader bitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
//創建LinearGradient,用以產生從左上角到右下角的顏色漸變效果
LinearGradient linearGradient = new LinearGradient(0, 0, width, height,
Color.RED, Color.BLACK, Shader.TileMode.CLAMP);
//bitmapShader對應目標像素,linearGradient對應源像素,像素顏色混合採用MULTIPLY模式
ComposeShader composeShader = new ComposeShader(linearGradient, bitmapShader, PorterDuff.Mode.MULTIPLY);
//將組合的composeShader作爲畫筆paint繪圖所使用的shader
paint.setShader(composeShader);
//用composeShader繪製矩形區域
canvas.drawRect(0, 0, mBitmap.getWidth(), mBitmap.getHeight(), paint);
}
}
運行效果,本來我們的心,是白色的圖片,運行完變成紅色了。我們看下效果
例子,放大鏡效果
package com.dn_alan.myapplication.render;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Shader;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.view.MotionEvent;
import android.view.View;
import com.dn_alan.myapplication.R;
/**
* 放大鏡效果
*/
public class ZoomImageView extends View {
//放大倍數
private static final int FACTOR = 2;
//放大鏡的半徑
private static final int RADIUS = 100;
// 原圖
private Bitmap mBitmap;
// 放大後的圖
private Bitmap mBitmapScale;
// 製作的圓形的圖片(放大的局部),蓋在Canvas上面
private ShapeDrawable mShapeDrawable;
private Matrix mMatrix;
public ZoomImageView(Context context) {
super(context);
//加載一張圖片,要放大的圖片
mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy3);
mBitmapScale = mBitmap;
//放大後的整個圖片
mBitmapScale = Bitmap.createScaledBitmap(mBitmapScale,mBitmapScale.getWidth() * FACTOR,
mBitmapScale.getHeight() * FACTOR,true);
BitmapShader bitmapShader = new BitmapShader(mBitmapScale, Shader.TileMode.CLAMP,
Shader.TileMode.CLAMP);
mShapeDrawable = new ShapeDrawable(new OvalShape());
mShapeDrawable.getPaint().setShader(bitmapShader);
// 切出矩形區域,用來畫圓(內切圓)
mShapeDrawable.setBounds(0,0,RADIUS * 2,RADIUS * 2);
mMatrix = new Matrix();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 1、畫原圖
canvas.drawBitmap(mBitmap, 0 , 0 , null);
// 2、畫放大鏡的圖
mShapeDrawable.draw(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
// 將放大的圖片往相反的方向挪動
mMatrix.setTranslate(RADIUS - x * FACTOR, RADIUS - y *FACTOR);
mShapeDrawable.getPaint().getShader().setLocalMatrix(mMatrix);
// 切出手勢區域點位置的圓
mShapeDrawable.setBounds(x-RADIUS,y - RADIUS, x + RADIUS, y + RADIUS);
invalidate();
return true;
}
}
二濾鏡
濾鏡效果就是拿到圖像裏所有的像素點,改變其RGB值。有一種簡單的方法,就是使用顏色矩陣。
效果一模糊遮罩濾鏡
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//關閉單個View的硬件加速功,只針對當前View,不讓它硬件加速
setLayerType(View.LAYER_TYPE_SOFTWARE,null);
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight());
//50是陰影的半徑
// 四種模式:NORMOL -- 整個圖像都被模糊掉
// SOLID -- 圖像邊界外產生一層與Paint顏色一致陰影效果,不影響圖像的本身
// OUTER -- 圖像邊界外產生一層陰影,並且將圖像變成透明效果
// INNER -- 在圖像內部邊沿產生模糊效果
paint.setMaskFilter(new BlurMaskFilter(50,BlurMaskFilter.Blur.NORMAL));
canvas.drawRect(rectF,paint);
}
}
效果二浮雕遮罩濾鏡
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.EmbossMaskFilter;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//關閉單個View的硬件加速功,只針對當前View,不讓它硬件加速
setLayerType(View.LAYER_TYPE_SOFTWARE,null);
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight());
/**
* Create an emboss maskfilter
*
* @param direction 指定光源的位置,長度爲xxx的數組標量[x,y,z]
* @param ambient 環境光的因子 (0~1),越接近0,環境光越暗
* @param specular 鏡面反射係數 越接近0,鏡面反射越強
* @param blurRadius 模糊半徑 值越大,模糊效果越明顯
*/
paint.setMaskFilter(new EmbossMaskFilter(new float[]{1,1,1},0.2f,60,80));
canvas.drawRect(rectF,paint);
}
}
以上兩個效果都不常用,常用的是使用矩形改變像素點
效果三矩陣——平移運算,加法
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
//第一行表示R,第二行表示G,第三行表示B,第四行表示A
1,0,0,0,0,
0,1,0,0,100,
0,0,1,0,0,
0,0,0,1,0,
});
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight()+100);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,null,rectF,paint);
}
}
效果四:矩陣反相效果 – 底片效果
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
-1, 0,0,0,255,
0,-1,0,0,255,
0,0,-1,0,255,
0,0,0,1,0,
});
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight()+100);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,null,rectF,paint);
}
}
效果五:縮放運算—乘法 – 顏色增強
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
1.2f, 0,0,0,0,
0,1.2f,0,0,0,
0,0,1.2f,0,0,
0,0,0,1.2f,0,
});
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight()+100);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,null,rectF,paint);
}
}
上圖是原圖,下圖是應用了效果後的圖
效果五:黑白效果
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight());
canvas.drawBitmap(bitmap,null, rectF,paint);
paint.reset();
/** 黑白照片
*是將我們的三通道變爲單通道的灰度模式
*去色原理:只要把R G B 三通道的色彩信息設置成一樣,那麼圖像就會變成灰色,
*同時爲了保證圖像亮度不變,同一個通道里的R+G+B =1
*/
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
0.213f, 0.715f,0.072f,0,0,
0.213f, 0.715f,0.072f,0,0,
0.213f, 0.715f,0.072f,0,0,
0,0,0,1,0,
});
RectF rectF1 = new RectF(200,bitmap.getHeight()+100,bitmap.getWidth()+200,bitmap.getHeight()*2+100);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,null,rectF1,paint);
}
}
上圖是原圖,下圖是效果圖
效果六 髮色效果—(比如紅色和綠色交換)
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight());
canvas.drawBitmap(bitmap,null, rectF,paint);
paint.reset();
// 髮色效果---(比如紅色和綠色交換)
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
1,0,0,0,0,
0, 0,1,0,0,
0,1,0,0,0,
0,0,0,0.5F,0,
});
RectF rectF1 = new RectF(200,bitmap.getHeight()+100,bitmap.getWidth()+200,bitmap.getHeight()*2+100);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,null,rectF1,paint);
}
}
效果七復古效果
package com.example.paintgaojishiyong.guolv;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.example.paintgaojishiyong.R;
/**
* @author writing
* @time 2019/12/3 16:17
* @note
*/
public class FilterView extends View {
private Paint paint;
private Bitmap bitmap;
public FilterView(Context context) {
super(context);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public FilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.RED);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xyjy2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
RectF rectF = new RectF(200,100,bitmap.getWidth()+200,bitmap.getHeight());
canvas.drawBitmap(bitmap,null, rectF,paint);
paint.reset();
// 復古效果
ColorMatrix colorMatrix = new ColorMatrix(new float[]{
1/2f,1/2f,1/2f,0,0,
1/3f, 1/3f,1/3f,0,0,
1/4f,1/4f,1/4f,0,0,
0,0,0,1,0,
});
RectF rectF1 = new RectF(200,bitmap.getHeight()+100,bitmap.getWidth()+200,bitmap.getHeight()*2+100);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,null,rectF1,paint);
}
}
第三Xfermode
https://developer.android.google.cn/reference/android/graphics/PorterDuff.Mode?hl=en#ADD
https://blog.csdn.net/cquwentao/article/details/51423371
https://www.jianshu.com/p/d11892bbe055
以上是三篇參考的文章
第一:PorterDuff.Mode.DST_IN效果
保留覆蓋源像素的目標像素,丟棄其餘的源像素和目標像素。
我們看下兩張圖片