在畫布中旋轉文字

Question

如何旋轉畫布中的文字？我需要翻轉我倒過來的文字。

paint.setTextSize(20); 
canvas.drawText("3AM", xStored, yStored, paint); 

Answer 1

我從評論的解決方案通過羅曼蓋伊接受的答案

How can you display upside down text with a textview in Android?

下面引用您可以通過-1只是規模上的Y軸。

@Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     int cx = this.getMeasuredWidth()/2; 
     int cy = this.getMeasuredHeight()/2; 
     canvas.scale(1f, -1f, cx, cy); 
     canvas.drawText("3AM", cx, cy, p); 


} 

完整的例子：

public class SView extends View { 

    Paint p,paint; 
    public SView(Context context) { 
     super(context); 
     // TODO Auto-generated constructor stub 
     p = new Paint(); 
     p.setColor(Color.RED); 
     p.setTextSize(40); 
     paint = new Paint(); 
     paint.setColor(Color.BLUE); 
     paint.setTextSize(40); 
    } 
    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     int cx = this.getMeasuredWidth()/2; 
     int cy = this.getMeasuredHeight()/2; 

     canvas.drawText("3AM", cx, cy, paint); 
     canvas.save(); 

     canvas.scale(1f, -1f, cx, cy); 
     canvas.drawText("3AM", cx, cy, p); 
     canvas.restore(); 
} 
} 

快

Answer 2

您需要到畫布上的drawText（）調用之前旋轉：

canvas.save(); // svare the current state of the canvas 
canvas.rotate(180.0f); //rotates 180 degrees 
canvas.drawText("3AM", xStored, yStored, paint); 
canvas.restore(); //return to 0 degree 

**編輯 - 這隻會反轉，但它會回來到前。您實際上需要在文本基線上進行鏡像，假設這就是您的意思。

Answer 3

請參閱本link

int x = 75; 
    int y = 185; 
    paint.setColor(Color.GRAY); 
    paint.setTextSize(25); 
    String rotatedtext = "Rotated helloandroid :)"; 

    //Draw bounding rect before rotating text: 

    Rect rect = new Rect(); 
    paint.getTextBounds(rotatedtext, 0, rotatedtext.length(), rect); 
    canvas.translate(x, y); 
    paint.setStyle(Paint.Style.FILL); 

    canvas.drawText(rotatedtext , 0, 0, paint); 
    paint.setStyle(Paint.Style.STROKE); 
    canvas.drawRect(rect, paint); 

    canvas.translate(-x, -y); 


    paint.setColor(Color.RED); 
    canvas.rotate(-45, x + rect.exactCenterX(),y + rect.exactCenterY()); 
    paint.setStyle(Paint.Style.FILL); 
    canvas.drawText(rotatedtext, x, y, paint);