Question

如何在画布上绘制可绘制的图像？我从资源中获取我的图像并在画布上绘制该图像。这可能我们可以声明多个画布并将所有画布设置为一个吗？我已经在画布上有图像了，想在那上画一个可绘制的图像？

private Bitmap drawtextonimage(Bitmap bitmap, String text, String caption) {
    caption = caption.replace("\n", " ");

声明画布和画图？

    Canvas cs = new Canvas(bitmap);
    Paint tPaint = new Paint();
    Paint captionPaint = new Paint();

    if (text.equals("Good")) {
        tPaint.setColor(Color.GREEN);
    } else {
        tPaint.setColor(Color.RED);
    }

    tPaint.setStyle(Style.FILL);
    tPaint.setTextSize(30);

    //

    captionPaint.setColor(Color.CYAN);
    captionPaint.setAlpha(100);
    captionPaint.setTextSize(25);
    captionPaint.setTextScaleX((float) 0.7);
    captionPaint.setTextAlign(Align.CENTER);
    captionPaint.setTypeface(Typeface.SERIF);
    captionPaint.setShadowLayer(1f, 0, 1f, Color.WHITE);

    /*Canvas cs1 = new Canvas(bitmap);

        cs1.drawRect(0, bitmap.getHeight(), bitmap.getWidth(), 500, tPaint);

       // canvas.drawRect(33, 33, 77, 60, paint );
        Paint zPaint = new Paint();
         cs1.drawARGB((int) 0.5,54,54,200);*/ 

//         cs.drawText(text, 60, 60, tPaint);

这个方法得到我的可绘制图像并在画布上绘制，但它不起作用？

     Resources res = getResources();
     Bitmap bitmapx = BitmapFactory.decodeResource(res, R.drawable.overlay_good_full);
     Bitmap bitmapxx = BitmapFactory.decodeResource(res, R.drawable.overlay_bad_full);
    if(text.equals("Good"))
    {


        cs.drawBitmap(bitmapx, 0, 0, new Paint());
        //cs.drawBitmap(bitmapx, 0, 0, tPaint);

    }
    else
    {
         // cs.drawBitmap(bitmapxx, 0, 0, tPaint);

    }

    cs.drawText(caption, (bitmap.getWidth() / 2), bitmap.getHeight()
            , captionPaint);




//  canvas.drawBitmap(image, 0, 0, null);


//  Log.i("Caption", caption);
    return bitmap;

}

Answer 1

以下代码将Drawable从资源绘制到从Bitmap创建的画布上（在本例中为相机预览中的位图）。这已经过测试，适用于API 22+（尚未使用早期版本进行测试）：

protected void pictureBox1_Paint(object sender, PaintEventArgs e)
{
   Graphics papel = e.Graphics();
   Pen lapiz = new Pen(Color.Black);
   //Dibujo de ejes X y Y
   papel.DrawLine(lapiz, 20, 425, 742, 425);
   papel.DrawLine(lapiz, 20, 425, 20, 20);
   papel.DrawString("X", myFont, Brushes.Black, new Point(745, 418));
   papel.DrawString("Y", myFont, Brushes.Black, new Point(14, 5));
}

在画布上绘制我的可绘图像？

1 个答案: