Android Shape 形狀

標籤：android   shape   

Shape繼承體系：

Shape (android.graphics.drawable.shapes)
----PathShape (android.graphics.drawable.shapes)
----RectShape (android.graphics.drawable.shapes)
--------ArcShape (android.graphics.drawable.shapes)
--------OvalShape (android.graphics.drawable.shapes)
--------RoundRectShape (android.graphics.drawable.shapes)

RectShape

RectShape rectShape = new RectShape();ShapeDrawable drawable = new ShapeDrawable(rectShape);drawable.getPaint().setColor(Color.RED);drawable.getPaint().setStyle(Paint.Style.FILL); //填充view.setBackgroundDrawable(drawable);

 矩形

RoundRectShape

float[] outerRadii = {20, 20, 40, 40, 60, 60, 80, 80};//外矩形 左上、右上、右下、左下 圓角半徑//float[] outerRadii = {20, 20, 20, 20, 20, 20, 20, 20};//外矩形 左上、右上、右下、左下 圓角半徑RectF inset = new RectF(100, 100, 200, 200);//內矩形距外矩形，左上方x,y距離， 右下角x,y距離float[] innerRadii = {20, 20, 20, 20, 20, 20, 20, 20};//內矩形 圓角半徑//RoundRectShape roundRectShape = new RoundRectShape(outerRadii, inset, innerRadii);RoundRectShape roundRectShape = new RoundRectShape(outerRadii, null, innerRadii); //無內矩形ShapeDrawable drawable = new ShapeDrawable(roundRectShape);drawable.getPaint().setColor(Color.MAGENTA);drawable.getPaint().setAntiAlias(true);drawable.getPaint().setStyle(Paint.Style.STROKE);//描邊view.setBackground(drawable);

 無內矩形的圓角矩形  帶內矩形的圓角矩形

OvalShape

OvalShape ovalShape = new OvalShape();ShapeDrawable drawable = new ShapeDrawable(ovalShape);drawable.getPaint().setColor(Color.RED);drawable.getPaint().setStyle(Paint.Style.FILL_AND_STROKE);view.setBackgroundDrawable(drawable);

 橢圓。 當View的寬高相等時，就繪出了圓

ArcShape

ArcShape arcShape = new ArcShape(45, 270); //順時針  開始角度45， 掃描的角度270   扇形ShapeDrawable drawable = new ShapeDrawable(arcShape);drawable.getPaint().setColor(Color.RED);drawable.getPaint().setStyle(Paint.Style.FILL);// Bitmap bitmap =  ((BitmapDrawable)getResources().getDrawable(R.drawable.aa)).getBitmap();// BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.MIRROR, Shader//                .TileMode.REPEAT);// Matrix matrix = new Matrix();// matrix.preScale(600.00f / bitmap.getWidth(), 600.00f / bitmap.getHeight());//view:w=600,h=600// bitmapShader.setLocalMatrix(matrix);// drawable.getPaint().setShader(bitmapShader);view.setBackgroundDrawable(drawable);

 扇形圖

 結合BitmapShader

PathShape

Path path = new Path();path.moveTo(50, 0);path.lineTo(0, 50);path.lineTo(50, 100);path.lineTo(100, 50);path.lineTo(50, 0);PathShape pathShape = new PathShape(path, 200, 100);ShapeDrawable drawable = new ShapeDrawable(pathShape);drawable.getPaint().setColor(Color.RED);drawable.getPaint().setStyle(Paint.Style.FILL);imageView.setBackgroundDrawable(drawable);

以Path路徑對象，來設定圖形。

PathShape的建構函式：PathShape(path, stdWidth, stdHeight);

   stdWidth：標準寬度

   stdHeight：標準高度

 在構造PathShape對象時，設定了寬高的標準。內建函式 

protected void onResize(float width, float height) {    mScaleX = width / mStdWidth;    mScaleY = height / mStdHeight;}public void draw(Canvas canvas, Paint paint) {    canvas.save();    canvas.scale(mScaleX, mScaleY);    canvas.drawPath(mPath, paint);    canvas.restore();}

  Shape基類中有函數 resize()，其中調用了onResize()；ShapeDrawable中會調用resize()。

  有了設定的標準寬高，再算出實際寬高與標準寬高的比率，最後在繪製時，畫布canvas縮放。

  造成的效果： path中的(x,y)座標值 乘以 比率值，即是 最終呈現出的座標值(實際內部是縮放的canvas)

  比如，這裡view的 w=400， h=400

  如果標準寬高都等於400，那麼canvas最終不縮放，即1:1。 

  PathShape pathShape = new PathShape(path, 400, 400);

    stdx=400, stdy=400

PathShape pathShape = new PathShape(path, 100, 100);

 stdx=100, stdy=100  

PathShape pathShape = new PathShape(path, 200, 100);

 stdx=200, stdy=100

  

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Android Shape 形狀