I want to draw a signal image as shown below at runtime on canvas.
sample code which I used to draw this signal is as below.
Ellipse Ellipse1 = new Ellipse();
Ellipse Ellipse2 = new Ellipse();
Ellipse Ellipse3 = new Ellipse();
Line lineV = new Line();
Line lineH = new Line();
lineV.Stroke = SystemColors.WindowFrameBrush;
lineV.X1 = EndPosition.X;
lineV.Y1 = EndPosition.Y;
lineV.X2 = StartPosition.X;
lineV.Y2 = EndPosition.Y;
SolidColorBrush redBrush = new SolidColorBrush();
redBrush.Color = Colors.Black;
lineV.StrokeThickness = 2;
lineV.Stroke = redBrush;
canvas1.Children.Add(lineV);
lineH.Stroke = SystemColors.WindowFrameBrush;
lineH.X1 = StartPosition.X;
lineH.Y1 = EndPosition.Y;
lineH.X2 = StartPosition.X;
lineH.Y2 = StartPosition.Y;
redBrush.Color = Colors.Black;
lineH.StrokeThickness = 2;
lineH.Stroke = redBrush;
canvas1.Children.Add(lineH);
SolidColorBrush mySolidColorBrush1 = new SolidColorBrush();
mySolidColorBrush1.Color = Colors.Red; //FromArgb(255, 255, 255, 0);
Ellipse1.Fill = mySolidColorBrush1;
Ellipse1.StrokeThickness = 2;
Ellipse1.Stroke = Brushes.Black;
Ellipse1.Width = 30;
Ellipse1.Height = 30;
Ellipse1.Margin = new Thickness(EndPosition.X, EndPosition.Y - 15, EndPosition.X + 50, EndPosition.Y + 50);
canvas1.Children.Add(Ellipse1);
SolidColorBrush mySolidColorBrush2 = new SolidColorBrush();
mySolidColorBrush2.Color = Colors.Green; //FromArgb(255, 255, 255, 0);
Ellipse2.Fill = mySolidColorBrush2;
Ellipse2.StrokeThickness = 2;
Ellipse2.Stroke = Brushes.Black;
Ellipse2.Width = 30;
Ellipse2.Height = 30;
Ellipse2.Margin = new Thickness(EndPosition.X + 30, EndPosition.Y - 15, EndPosition.X + 60, EndPosition.Y + 50);
canvas1.Children.Add(Ellipse2);
SolidColorBrush mySolidColorBrush3 = new SolidColorBrush();
mySolidColorBrush3.Color = Colors.Yellow; // FromArgb(255, 255, 255, 0);
Ellipse3.Fill = mySolidColorBrush3;
Ellipse3.StrokeThickness = 2;
Ellipse3.Stroke = Brushes.Black;
Ellipse3.Width = 30;
Ellipse3.Height = 30;
Ellipse3.Margin = new Thickness(EndPosition.X + 60, EndPosition.Y - 15, EndPosition.X + 150, EndPosition.Y + 50);
canvas1.Children.Add(Ellipse3);
**Now I want the user to be able to interactively move this signal on the canvas on mouse move events.
How can I able to do this ?**
Iam using C# WPF.
If want to implement a canvas to drag elements, a DragCanvas is your choice.
Dragging Elements in a Canvas from Josh Smith and after Dragging Elements in a Canvas from igkutikov that adapt Josh Smith code. There are articles with #mustread category.
With the dragCanvas you can implement a full functionality Dragging Element Canvas, and better adapt to your code. Happy coding!
Related
I am a beginner in xamarin ios, I want to create a table with 3 columns and multiple rows, and the no of row is depends on the data coming from the API .How can I do this...
Please help me...
I want to create the table like this...
You can simulate drawing the chart by following steps.
Custom TableHeaderView with three black rectangle ,just need add three label with its black border.
Do the same work as step1 with TableViewCell, and then place a textfield in first rectangle, place a button and a label in second rectangle,place two button in third rectangle.
Sample Code
TableHeaderView
public class headerView : UIView
{
public headerView()
{
this.Frame = new CGRect(0, 0, UIScreen.MainScreen.Bounds.Width, 50);
nfloat width = UIScreen.MainScreen.Bounds.Width / 3;
UILabel title = new UILabel();
title.Text = "Title";
title.TextColor = UIColor.Black;
title.TextAlignment = UITextAlignment.Center;
title.Font = UIFont.SystemFontOfSize(20);
title.Layer.BorderColor = UIColor.Black.CGColor;
title.Layer.BorderWidth = 1;
title.Frame = new CGRect(0, 0, width, 50);
this.Add(title);
UILabel File = new UILabel();
File.Text = "File";
File.TextColor = UIColor.Black;
File.TextAlignment = UITextAlignment.Center;
File.Font = UIFont.SystemFontOfSize(20);
File.Layer.BorderColor = UIColor.Black.CGColor;
File.Layer.BorderWidth = 1;
File.Frame = new CGRect(width, 0, UIScreen.MainScreen.Bounds.Width / 3, 50);
this.Add(File);
UILabel Option = new UILabel();
Option.Text = "Option";
Option.TextColor = UIColor.Black;
Option.TextAlignment = UITextAlignment.Center;
Option.Font = UIFont.SystemFontOfSize(20);
Option.Layer.BorderColor = UIColor.Black.CGColor;
Option.Layer.BorderWidth = 1;
Option.Frame = new CGRect(width * 2, 0, UIScreen.MainScreen.Bounds.Width / 3, 50);
this.Add(Option);
}
}
table.TableHeaderView = new headerView();
TableViewCell
public CustomVegeCell (NSString cellId) : base (UITableViewCellStyle.Default, cellId)
{
SelectionStyle = UITableViewCellSelectionStyle.Gray;
nfloat width = UIScreen.MainScreen.Bounds.Width / 3;
UIView headingLabel = new UIView();
headingLabel.Layer.BorderColor = UIColor.Black.CGColor;
headingLabel.Layer.BorderWidth = 1;
headingLabel.Frame = new CGRect(0, 0, width, 100);
UIView subheadingLabel = new UIView();
subheadingLabel.Layer.BorderColor = UIColor.Black.CGColor;
subheadingLabel.Layer.BorderWidth = 1;
subheadingLabel.Frame = new CGRect(width, 0, width, 100);
UIView imageView = new UIView();
imageView.Layer.BorderColor = UIColor.Black.CGColor;
imageView.Layer.BorderWidth = 1;
imageView.Frame = new CGRect(width *2, 0, width, 100);
ContentView.Add (headingLabel);
ContentView.Add (subheadingLabel);
ContentView.Add (imageView);
///add additional control here
}
I have a code that adds new elements to a grid:
for (int i = 1; i < 20; i++)
{
Ellipse el = new Ellipse();
el.Height = 200;
el.Width = 200;
el.StrokeThickness = 5;
SolidColorBrush mySolidColorBrush = new SolidColorBrush();
mySolidColorBrush.Color = Color.FromArgb(255, 255, 0, 0);
el.Fill = mySolidColorBrush;
ViewGrid.ColumnDefinitions.Add(new ColumnDefinition());
ViewGrid.RowDefinitions.Add(new RowDefinition());
Grid.SetColumn(el, i);
ViewGrid.Children.Add(el);
}
My problem is that I want to start a new Row as soon as my current Column is full. As the window can be resized, I never know how many Elements can fit into one Column, so I also can't just assign a new Row when adding them.
Is there any way to make the Grid (or any other type of "table") handle this?
Change Your Grid into GridView
<GridView Name="ViewGrid"/>
Use the following code to put items in it.
for (int i = 1; i < 20; i++)
{
Ellipse el = new Ellipse();
el.Height = 200;
el.Width = 200;
el.StrokeThickness = 5;
SolidColorBrush mySolidColorBrush = new SolidColorBrush();
mySolidColorBrush.Color = Color.FromArgb(255, 255, 0, 0);
el.Fill = mySolidColorBrush;
ViewGrid.Items.Add(el);
}
So, Basically I'm trying to draw a line between the center of 2 ellipses
And I think this should do it:
Path myPath = new Path();
myPath.Stroke = System.Windows.Media.Brushes.Black;
myPath.StrokeThickness = 4;
myPath.HorizontalAlignment = HorizontalAlignment.Left;
myPath.VerticalAlignment = VerticalAlignment.Center;
EllipseGeometry myEllipseGeometry = new EllipseGeometry();
myEllipseGeometry.Center = new System.Windows.Point((xQuard * 10) + 100, yQuard * 10);
myEllipseGeometry.RadiusX = 2;
myEllipseGeometry.RadiusY = 2;
myPath.Data = myEllipseGeometry;
GraphPanel.Children.Add(myPath);
//if it's not the first point...
if (prevA != 0.0)
{
Path iLine = new Path();
iLine.Stroke = Brushes.Black;
iLine.StrokeThickness = 4;
iLine.HorizontalAlignment = HorizontalAlignment.Left;
myPath.VerticalAlignment = VerticalAlignment.Center;
LineGeometry iLineGeometry = new LineGeometry();
iLineGeometry.StartPoint = myEllipseGeometry.Center;
iLineGeometry.EndPoint = new System.Windows.Point(prevA, prevB);
iLine.Data = iLineGeometry;
GraphPanel.Children.Add(iLine);
}
//Set the previous point(s)
prevA = (xQuard * 10) + 100;
prevB = yQuard * 10;
Now as you can see, I've set the Line's StartPoint = to the first ellipse start point
And Yet....
Why is the Line's start point in the picture not the center of the point on the left?
I think you mean iLine.VerticalAlignment instead of myPath.VerticalAlignment the second time, right?
I have two UIElements(i.e. rectangles) in Canvas and their coordinates. How can I connect them with arc in code behind?
No need to get an exact hit on the rectangles (or other objects): make sure the Z ordering is correct. arc.SetValue(Canvas.ZIndex, -1) will push it to the background. If you want a perpendicular hit, you'll need to break out the algebra :/
For the arc: (see http://msdn.microsoft.com/en-us/library/ms751808.aspx), it needs to be contained in a PathFigure.
Edit: this shows two connected rectangles. The line simple runs between the two centers. The arc starts on one center (the pathFigure startpoint), first argument is the center of the second object.
r1 = new Rectangle();
r1.Margin = new Thickness(50, 50, 0, 0);
r1.VerticalAlignment = System.Windows.VerticalAlignment.Top;
r1.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
r1.Height = 50;
r1.Width= 50;
r1.Fill = new SolidColorBrush(Colors.Red);
r2 = new Rectangle();
r2.Width = 50;
r2.Height = 50;
r2.Fill = new SolidColorBrush(Colors.Blue);
r2.Margin = new Thickness(350, 450, 0, 0);
r2.VerticalAlignment = System.Windows.VerticalAlignment.Top;
r2.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
l = new Line();
l.X1 = 75;
l.Y1 = 75;
l.X2 = 375;
l.Y2 = 475;
l.Fill = new SolidColorBrush(Colors.Purple);
l.Stroke = new SolidColorBrush(Colors.Purple);
l.StrokeThickness = 2;
l.SetValue(Canvas.ZIndexProperty, -1);
PathGeometry myPathGeometry = new PathGeometry();
// Create a figure.
PathFigure pathFigure1 = new PathFigure();
pathFigure1.StartPoint = new Point(75, 75);
pathFigure1.Segments.Add(
new ArcSegment(
new Point(375, 475),
new Size(50, 50),
45,
true, /* IsLargeArc */
SweepDirection.Clockwise,
true /* IsStroked */ ));
myPathGeometry.Figures.Add(pathFigure1);
// Display the PathGeometry.
Path myPath = new Path();
myPath.Stroke = Brushes.Black;
myPath.StrokeThickness = 1;
myPath.Data = myPathGeometry;
myPath.SetValue(Canvas.ZIndexProperty, -1);
LayoutRoot.Children.Add(r1);
LayoutRoot.Children.Add(r2);
LayoutRoot.Children.Add(l);
LayoutRoot.Children.Add(myPath);
It won't change the position, the position is fixed at runtime even though i change the value 50 below:
System.Windows.Shapes.Rectangle myRectangle = new System.Windows.Shapes.Rectangle();
mainGrid.Children.Add(myRectangle);
Canvas.SetLeft(myRectangle, 50);
Canvas.SetTop(myRectangle, 50);
myRectangle.Height = 100;
myRectangle.Width = 100;
myRectangle.Stroke = System.Windows.Media.Brushes.LightSteelBlue;
here are the 2 solutions for your problem
1) with a canvas
var myRectangle = new System.Windows.Shapes.Rectangle();
var mainCanvas = new Canvas();
mainGrid.Children.Add(mainCanvas);
mainCanvas.Children.Add(myRectangle);
Canvas.SetLeft(myRectangle, 50);
Canvas.SetTop(myRectangle, 50);
myRectangle.Height = 100;
myRectangle.Width = 100;
myRectangle.Stroke = System.Windows.Media.Brushes.LightSteelBlue;
2) only with your grid
var myRectangle = new System.Windows.Shapes.Rectangle();
mainGrid.Children.Add(myRectangle);
myRectangle.Margin = new Thickness(50, 50, 0, 0);
myRectangle.HorizontalAlignment = HorizontalAlignment.Left;
myRectangle.VerticalAlignment = VerticalAlignment.Top;
myRectangle.Height = 100;
myRectangle.Width = 100;
myRectangle.Stroke = System.Windows.Media.Brushes.LightSteelBlue;