How to draw accurate shapes in Windows 8 store application

Question

Hi all,

I am using drawing paint in my windows 8 store application.But the shapes are not getting in a accurate manner. Here is my code below. Kindly help me. Thanks in advance.

public sealed partial class ConjunctivaMainView : UserControl

{

Rect _windowBounds;

InkManager _inkManager = new InkManager();

InkDrawingAttributes _drawingAttributes = new InkDrawingAttributes();

private uint _penID;

private uint _touchID;

Rect selectedStrokes;

private Point _previousContactPt;

private PointerPoint _firstContactPt;

private bool _isMoved;

Color _chosenColor;

Point rememberPt;

int i = 0;

double imgBrWidth;

double imgBrHeigth;

Thickness ViewMargin;

bool IsStrokesLoaded = false;

public ConjunctivaMainView()

{

this.InitializeComponent();

// FlipView4.ItemsSource = PageCollection;

try

{

//ContextControl.ItemsSource = PageCollection;

//ContextControl.SelectedIndex = 0;

_windowBounds = Window.Current.Bounds;

InkCanvas.PointerExited += new PointerEventHandler(InkCanvas_PointerReleased);

ColorsListBox.SelectedIndex = 0;

sizeCombo.SelectedIndex = 1;

_drawingAttributes.PenTip = PenTipShape.Circle;

//ReadFromXML_Click_1();

//ViewMargin = MRBorder.Margin;

//this.ConjunctivaPopupRect.Visibility = Visibility.Collapsed;

//MinimiseViewBoxButton.Visibility = Visibility.Collapsed;

}

catch { }

}

#region Image

private void InkCanvas_PointerPressed(object sender, PointerRoutedEventArgs e)

{

try

{

_isMoved = false;

PointerPoint pt = e.GetCurrentPoint(InkCanvas);

_previousContactPt = pt.Position;

_firstContactPt = pt;

if (i == 0)

rememberPt = pt.Position;

i = 1;

PointerDeviceType pointerDevType = e.Pointer.PointerDeviceType;

if (pointerDevType == PointerDeviceType.Pen || pointerDevType == PointerDeviceType.Touch ||

pointerDevType == PointerDeviceType.Mouse &&

pt.Properties.IsLeftButtonPressed)

{

_inkManager.ProcessPointerDown(pt);

_penID = pt.PointerId;

e.Handled = true;

}

}

catch

{

e.Handled = true;

}

}

private void InkCanvas_PointerMoved(object sender, PointerRoutedEventArgs e)

{

try

{

if (e.Pointer.PointerId == _penID)

{

PointerPoint pt = e.GetCurrentPoint(InkCanvas);

Point currentContactPt = pt.Position;

if (Distance(currentContactPt, _previousContactPt) > 2)

{

_isMoved = true;

Line line = new Line()

{

X1 = _previousContactPt.X,

Y1 = _previousContactPt.Y,

X2 = currentContactPt.X,

Y2 = currentContactPt.Y,

StrokeThickness = _drawingAttributes.Size.Width,

Stroke = new SolidColorBrush(_drawingAttributes.Color)

};

_previousContactPt = currentContactPt;

InkCanvas.Children.Add(line);

_inkManager.ProcessPointerUpdate(pt);

}

}

e.Handled = true;

}

catch

{

e.Handled = true;

}

}

private double Distance(Point currentContactPt, Point _previousContactPt)

{

double d = 0;

d = Math.Sqrt(Math.Pow((currentContactPt.X - _previousContactPt.X), 2) + Math.Pow((currentContactPt.Y - _previousContactPt.Y), 2));

return d;

}

private void InkCanvas_PointerReleased(object sender, PointerRoutedEventArgs e)

{

try

{

int strokeCount = -1;

if (e.Pointer.PointerId == _penID)

{

PointerPoint pt = e.GetCurrentPoint(InkCanvas);

_inkManager.ProcessPointerUp(pt);

strokeCount = _inkManager.GetStrokes().Count;

if (strokeCount > 0)

(_inkManager.GetStrokes())[strokeCount - 1].DrawingAttributes = _drawingAttributes;

if (_inkManager.Mode == InkManipulationMode.Selecting)

selectedStrokes = _inkManager.SelectWithLine(_firstContactPt.Position, pt.Position);

}

_touchID = 0;

_penID = 0;

if (_isMoved == true)

{

RenderAllStrokes();

}

e.Handled = true;

}

catch

{

e.Handled = true;

}

}

private async void RenderAllStrokes()

{

var img = InkCanvas.Children.ElementAt(0);

InkCanvas.Children.Clear();

InkCanvas.Children.Add(img);

RenderingHelpers.RenderInk(InkCanvas, _inkManager, _chosenColor);

Task savestrokesTask = SaveStrokes();

await savestrokesTask;

}

private void Eraser_Click(object sender, RoutedEventArgs e)

{

_inkManager.Mode = InkManipulationMode.Erasing;

}

private void Pencil_Click(object sender, RoutedEventArgs e)

{

_inkManager.Mode = InkManipulationMode.Inking;

}

private void ColorsListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)

{

int selectedIndex = ((ListBox)sender).SelectedIndex;

switch (selectedIndex)

{

case 0:

_drawingAttributes.Color = Colors.Red;

break;

case 1:

_drawingAttributes.Color = Colors.Green;

break;

case 2:

_drawingAttributes.Color = Colors.Blue;

break;

case 3:

_drawingAttributes.Color = Colors.Gray;

break;

case 4:

_drawingAttributes.Color = Colors.Yellow;

break;

case 5:

_drawingAttributes.Color = Colors.Black;

break;

default:

_drawingAttributes.Color = Colors.Black;

break;

}

}

private void sizeCombo_SelectionChanged_1(object sender, SelectionChangedEventArgs e)

{

int selectedIndex = ((ComboBox)sender).SelectedIndex;

switch (selectedIndex)

{

case 0:

_drawingAttributes.Size = new Size(1.0, 1.0);

break;

case 1:

_drawingAttributes.Size = new Size(3.0, 3.0);

break;

case 2:

_drawingAttributes.Size = new Size(5.0, 5.0);

break;

case 3:

_drawingAttributes.Size = new Size(8.0, 8.0);

break;

default:

_drawingAttributes.Size = new Size(1.0, 1.0);

break;

}

}

byte[] strokes;

InMemoryRandomAccessStream mem;

//private async void Save_Click(object sender, RoutedEventArgs e)

//{

// Task t=SaveStrokes();

// await t;

//}

private async Task SaveStrokes()

{

try

{

// Bug fix - Last stroke wasn't cleared

// by Usha 18th Jun '13

if (_inkManager.GetStrokes().Count > 0)

{

using (InMemoryRandomAccessStream mem = new InMemoryRandomAccessStream())

{

await _inkManager.SaveAsync(mem);

mem.Seek(0);

strokes = new byte[mem.Size];

mem.AsStream().Read(strokes, 0, strokes.Count());

(this.DataContext as EyeTouch.ViewModel.Exams.SLE.ExamConjunctivaViewModel).EyeImageXAML = new byte[strokes.Length];

strokes.CopyTo((this.DataContext as EyeTouch.ViewModel.Exams.SLE.ExamConjunctivaViewModel).EyeImageXAML, 0);

}

}

else

{

strokes = new byte[0];

(this.DataContext as EyeTouch.ViewModel.Exams.SLE.ExamConjunctivaViewModel).EyeImageXAML = new byte[0];

}

}

catch

{

}

}

private async void ReadFromXML_Click_1()

{

try

{

using (InMemoryRandomAccessStream mem = new InMemoryRandomAccessStream())

{

strokes = new byte[(this.DataContext as EyeTouch.ViewModel.Exams.SLE.ExamConjunctivaViewModel).EyeImageXAML.Length];

(this.DataContext as EyeTouch.ViewModel.Exams.SLE.ExamConjunctivaViewModel).EyeImageXAML.CopyTo(strokes, 0);

await mem.AsStream().WriteAsync(strokes, 0, strokes.Length);

mem.AsStream().Flush();

//mem.AsStream().Write(strokes, 0, strokes.Length);

mem.Seek(0);

var ran = mem.GetInputStreamAt(0);

await _inkManager.LoadAsync(ran);

var img = InkCanvas.Children.ElementAt(0);

InkCanvas.Children.Clear();

InkCanvas.Children.Add(img);

RenderingHelpers.RenderInk(InkCanvas, _inkManager, _chosenColor);

}

}

catch (Exception ex)

{

}

}

#endregion