public void DrawRectangle(Pen pen, int x1, int y1, int w, int h)
{
APaint.Color = pen.Color.AColor();
APaint.Flags = (Android.Graphics.PaintFlags) 0;
APaint.Flags = Flags;
APaint.SetStyle(Android.Graphics.Paint.Style.Stroke);
APaint.StrokeWidth = LineWidth;
ACanvas.DrawRect(x1, y1, x1 + w, y1 + h, APaint);
}
public void SurfaceCreated(ISurfaceHolder holder)
{
this.holder = holder;
//畫筆定義
Android.Graphics.Paint mpaint = new Android.Graphics.Paint();
mpaint.Color = Android.Graphics.Color.Yellow;
mpaint.SetStyle(Android.Graphics.Paint.Style.Stroke);
mpaint.StrokeWidth = 4f;
//畫布
Android.Graphics.Canvas canvas = holder.LockCanvas();
//清除畫布用
canvas.DrawColor(Android.Graphics.Color.Transparent, Android.Graphics.PorterDuff.Mode.Clear);
// 畫布長寬
var w = sv_rec.Width;
var h = sv_rec.Height;
//控制正方形位置
Android.Graphics.Rect r = new Android.Graphics.Rect((int)w / 16, (int)h / 8, (int)w / 16 + 7 * w / 8, (int)h / 8 + h / 2);
//canvas.DrawRect(r, mpaint); //正方形
//左下框
canvas.DrawRect(r.Left - 2, r.Bottom, r.Left + 50, r.Bottom + 2, mpaint);
canvas.DrawRect(r.Left - 2, r.Bottom - 50, r.Left, r.Bottom, mpaint);
//左上框
canvas.DrawRect(r.Left - 2, r.Top - 2, r.Left + 50, r.Top, mpaint);
canvas.DrawRect(r.Left - 2, r.Top, r.Left, r.Top + 50, mpaint);
//右上框
canvas.DrawRect(r.Right - 50, r.Top - 2, r.Right + 2, r.Top, mpaint);
canvas.DrawRect(r.Right, r.Top, r.Right + 2, r.Top + 50, mpaint);
//右下框
canvas.DrawRect(r.Right - 50, r.Bottom, r.Right + 2, r.Bottom + 2, mpaint);
canvas.DrawRect(r.Right, r.Bottom - 50, r.Right + 2, r.Bottom, mpaint);
holder.UnlockCanvasAndPost(canvas);
}
public override Carto.Graphics.Bitmap OnDrawPopup(PopupDrawInfo popupDrawInfo)
{
PopupStyle style = popupDrawInfo.Popup.Style;
// Calculate scaled dimensions
float DPToPX = popupDrawInfo.DPToPX;
float PXTODP = 1 / DPToPX;
if (style.ScaleWithDPI)
{
DPToPX = 1;
}
else
{
PXTODP = 1;
}
float screenWidth = popupDrawInfo.ScreenBounds.GetWidth() * PXTODP;
float screenHeight = popupDrawInfo.ScreenBounds.GetHeight() * PXTODP;
// Update sizes based on scale (uses extension method, cf. Shared/Extensions
int fontSize = FontSize.Update(DPToPX);
int triangleWidth = TriangleSize.Update(DPToPX);
int triangleHeight = TriangleSize.Update(DPToPX);
int strokeWidth = StrokeWidth.Update(DPToPX);
int screenPadding = ScreenPadding.Update(DPToPX);
// Set font
var font = Android.Graphics.Typeface.Create("HelveticaNeue-Light", Android.Graphics.TypefaceStyle.Normal);
// Calculate the maximum popup size, adjust with dpi
int maxPopupWidth = (int)(Math.Min(screenWidth, screenHeight));
float halfStrokeWidth = strokeWidth * 0.5f;
int maxTextWidth = maxPopupWidth - (2 * screenPadding + strokeWidth);
// Measure text
TextPaint textPaint = new TextPaint {
Color = TextColor, TextSize = fontSize
};
textPaint.SetTypeface(font);
var textLayout = new StaticLayout(text, textPaint, maxTextWidth, Layout.Alignment.AlignNormal, 1, 0, false);
int textX = (int)Math.Min(textPaint.MeasureText(text), textLayout.Width);
int textY = textLayout.Height;
int popupWidth = textX + (2 * PopupPadding + strokeWidth + triangleWidth);
int popupHeight = textY + (2 * PopupPadding + strokeWidth);
var bitmap = Android.Graphics.Bitmap.CreateBitmap(popupWidth, popupHeight, Android.Graphics.Bitmap.Config.Argb8888);
var canvas = new Android.Graphics.Canvas(bitmap);
var trianglePath = new Android.Graphics.Path();
trianglePath.MoveTo(triangleWidth, 0);
trianglePath.LineTo(halfStrokeWidth, triangleHeight * 0.5f);
trianglePath.LineTo(triangleWidth, triangleHeight);
trianglePath.Close();
int triangleOffsetX = 0;
int triangleOffsetY = (popupHeight - triangleHeight) / 2;
// Create paint object
var paint = new Android.Graphics.Paint();
paint.AntiAlias = true;
paint.SetStyle(Android.Graphics.Paint.Style.Stroke);
paint.StrokeWidth = strokeWidth;
paint.Color = StrokeColor;
// Stroke background
var background = new Android.Graphics.RectF();
background.Left = triangleWidth;
background.Top = halfStrokeWidth;
background.Right = popupWidth - strokeWidth;
background.Bottom = popupHeight - strokeWidth;
canvas.DrawRect(background, paint);
// Stroke triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
// Fill background
paint.SetStyle(Android.Graphics.Paint.Style.Fill);
paint.Color = BackgroundColor;
canvas.DrawRect(background, paint);
// Fill triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
if (textLayout != null)
{
// Draw text
canvas.Save();
canvas.Translate(halfStrokeWidth + triangleWidth + PopupPadding, halfStrokeWidth + PopupPadding);
textLayout.Draw(canvas);
canvas.Restore();
}
return(BitmapUtils.CreateBitmapFromAndroidBitmap(bitmap));
}
public override Carto.Graphics.Bitmap OnDrawPopup(PopupDrawInfo popupDrawInfo)
{
PopupStyle style = popupDrawInfo.Popup.Style;
// Calculate scaled dimensions
float DPToPX = popupDrawInfo.DPToPX;
float PXTODP = 1 / DPToPX;
if (style.ScaleWithDPI)
{
DPToPX = 1;
}
else
{
PXTODP = 1;
}
float screenWidth = popupDrawInfo.ScreenBounds.GetWidth() * PXTODP;
float screenHeight = popupDrawInfo.ScreenBounds.GetHeight() * PXTODP;
// Update sizes based on scale (uses extension method, cf. Shared/Extensions
int fontSize = FontSize.Update(DPToPX);
int triangleWidth = TriangleSize.Update(DPToPX);
int triangleHeight = TriangleSize.Update(DPToPX);
int strokeWidth = StrokeWidth.Update(DPToPX);
int screenPadding = ScreenPadding.Update(DPToPX);
// Set font
var font = Android.Graphics.Typeface.Create("HelveticaNeue-Light", Android.Graphics.TypefaceStyle.Normal);
// Calculate the maximum popup size, adjust with dpi
int maxPopupWidth = (int)(Math.Min(screenWidth, screenHeight));
float halfStrokeWidth = strokeWidth * 0.5f;
int maxTextWidth = maxPopupWidth - (2 * screenPadding + strokeWidth);
// Measure text
TextPaint textPaint = new TextPaint { Color = TextColor, TextSize = fontSize };
textPaint.SetTypeface(font);
var textLayout = new StaticLayout(text, textPaint, maxTextWidth, Layout.Alignment.AlignNormal, 1, 0, false);
int textX = (int)Math.Min(textPaint.MeasureText(text), textLayout.Width);
int textY = textLayout.Height;
int popupWidth = textX + (2 * PopupPadding + strokeWidth + triangleWidth);
int popupHeight = textY + (2 * PopupPadding + strokeWidth);
var bitmap = Android.Graphics.Bitmap.CreateBitmap(popupWidth, popupHeight, Android.Graphics.Bitmap.Config.Argb8888);
var canvas = new Android.Graphics.Canvas(bitmap);
var trianglePath = new Android.Graphics.Path();
trianglePath.MoveTo(triangleWidth, 0);
trianglePath.LineTo(halfStrokeWidth, triangleHeight * 0.5f);
trianglePath.LineTo(triangleWidth, triangleHeight);
trianglePath.Close();
int triangleOffsetX = 0;
int triangleOffsetY = (popupHeight - triangleHeight) / 2;
// Create paint object
var paint = new Android.Graphics.Paint();
paint.AntiAlias = true;
paint.SetStyle(Android.Graphics.Paint.Style.Stroke);
paint.StrokeWidth = strokeWidth;
paint.Color = StrokeColor;
// Stroke background
var background = new Android.Graphics.RectF();
background.Left = triangleWidth;
background.Top = halfStrokeWidth;
background.Right = popupWidth - strokeWidth;
background.Bottom = popupHeight - strokeWidth;
canvas.DrawRect(background, paint);
// Stroke triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
// Fill background
paint.SetStyle(Android.Graphics.Paint.Style.Fill);
paint.Color = BackgroundColor;
canvas.DrawRect(background, paint);
// Fill triangle
canvas.Save();
canvas.Translate(triangleOffsetX, triangleOffsetY);
canvas.DrawPath(trianglePath, paint);
canvas.Restore();
if (textLayout != null)
{
// Draw text
canvas.Save();
canvas.Translate(halfStrokeWidth + triangleWidth + PopupPadding, halfStrokeWidth + PopupPadding);
textLayout.Draw(canvas);
canvas.Restore();
}
return BitmapUtils.CreateBitmapFromAndroidBitmap(bitmap);
}
protected override void DoDraw(Android.Graphics.Canvas canvas, Android.Graphics.Paint paint)
{
canvas.DrawRect(Bounds, paint);
}
/// <summary>
/// Get OCR text and draw lines on original photo
/// </summary>
/// <param name="imageBytes"></param>
/// <param name="threshhold"></param>
private async void PerformOCR(byte[] imageBytes, double threshhold)
{
if (_api.Initialized)
{
string resultText = "";
var result = await _api.SetImage(imageBytes);
if (result)
{
resultText = _api.Text;
bitmapWithBoxes = bitmap.Copy(bitmap.GetConfig(), true);
Android.Graphics.Canvas canvas = new Android.Graphics.Canvas(bitmapWithBoxes);
Android.Graphics.Color color = Android.Graphics.Color.IndianRed;
Android.Graphics.Paint paint = new Android.Graphics.Paint();
paint.SetStyle(Android.Graphics.Paint.Style.Stroke);
paint.StrokeWidth = 2;
foreach (Tesseract.Result r in _api.Results(Tesseract.PageIteratorLevel.Textline))
{
if (r.Confidence > 50)
{
paint.Color = Android.Graphics.Color.GreenYellow;
}
else if (r.Confidence > 10)
{
paint.Color = Android.Graphics.Color.DarkOrange;
}
else
{
paint.Color = Android.Graphics.Color.DarkRed;
}
canvas.DrawRect(r.Box.X, r.Box.Y, r.Box.X + r.Box.Width, r.Box.Y + r.Box.Height, paint);
}
canvas.Dispose();
Android.Util.Log.Info("tesseract result", resultText);
PostProcessing pp = new PostProcessing();
pp.ProcessString(resultText);
_data = pp.processedList;
}
}
else
{
Toast.MakeText(this, "OCR not initialized.", ToastLength.Long).Show();
}
}
