Develop Reference

When I Delete The Control, It Remains Drawn To Form

I created a container control that lists radio buttons similar to how the CheckedListBox control lists check boxes. The control functions fine, but when I delete the control, the border and background remain drawn to the form in the designer. If I run the program with the deleted control, the control doesn't appear drawn, it only is drawn in the designer.
Here is a picture of the control in action:
And here is of when I've deleted the control (the form in the designer is to the left, the running form is to the right):
I suppose it's not really a problem, but why is this happening? Also, although it shows two squares, that's only because I added another one and deleted it.
Here's the code for the ChromeRadioButtonListBox and the base ChromeContainerControl:
public class ChromeRadioButtonListBox : ChromeContainerControl
{
[Description("Determines what corner(s) will be rounded.")]
public Utilities.RoundedRectangle.RectangleCorners Corners { get; set; }
private int cornerRadius;
[Description("Determines the radius of the the corners")]
public int CornerRadius
{
get { return cornerRadius; }
set
{
if (value < 1)
Utilities.ThrowError("The radius cannot be less than 1. If you want no radius, set Corners to None.");
else
cornerRadius = value;
}
}
[Description("Determines the list of ChromeRadioButton controls that are displayed.")]
public ChromeRadioButton[] Items { get; set; }
public ChromeRadioButtonListBox()
{
this.AutoScroll = true;
this.CornerRadius = 1;
this.Items = new ChromeRadioButton[0];
}
protected override void Dispose(bool disposing)
{
for (int i = 0; i < Items.Length; i++)
Items[i].Dispose();
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics canvas = e.Graphics;
canvas.SmoothingMode = SmoothingMode.HighQuality;
Rectangle region = new Rectangle(0, 0, ClientRectangle.Width - 1, ClientRectangle.Height - 1);
GraphicsPath path = Utilities.RoundedRectangle.Create(region, CornerRadius, Corners);
canvas.FillPath(new LinearGradientBrush(region, fillColors[0], fillColors[1], 90), path);
canvas.DrawPath(new Pen(borderColor), path);
for (int i = 0; i < Items.Length; i++)
{
if (i == 0)
Items[i].Location = new Point(2, 2);
else
Items[i].Location = new Point(2, Items[i - 1].Location.Y + Size.Ceiling(canvas.MeasureString(Items[i - 1].Text, Items[i - 1].Font)).Height);
Controls.Add(Items[i]);
}
}
}
public abstract class ChromeContainerControl : ContainerControl, IDisposable
{
public override Color BackColor
{
get
{
return base.BackColor;
}
}
public Color borderColor;
public Color[] fillColors;
public ChromeContainerControl()
{
base.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
base.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
base.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
base.SetStyle(ControlStyles.UserPaint, true);
this.BackColor = Color.Transparent;
this.borderColor = Scheme.DefaultBorderColor;
this.fillColors = Scheme.DefaultFillColors;
this.Font = new Font("Verdana", 8f);
this.ForeColor = Color.FromArgb(70, 70, 70);
}
}

As I suggested in my comment below your question call base.Dispose(disposing)
protected override void Dispose(bool disposing)
{
for (int i = 0; i < Items.Length; i++)
Items[i].Dispose();
base.Dispose(disposing);
}
As you are overriding this method from the base class, it will only perform the operations you specify in that override. Calling the base.Dispose ensure that any cleanup performed in the base is also performed from your override.
You can read more info on Dispose and Finaliser implementations at http://msdn.microsoft.com/en-gb/library/vstudio/b1yfkh5e(v=vs.100).aspx

In the Dipose() method, all I needed to add was base.Dispose(disposing)!

Fading control in C#

I'm tring to build a Control derived class which supports an Opcacity property.
This control could host both text and image and will beable to fade them out and in.
Here is my code:
internal class FadeControl : Control
{
private int opacity = 100;
public FadeControl()
{
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
}
public int Opacity
{
get
{
return opacity;
}
set
{
if (value > 100) opacity = 100;
else if (value < 1) opacity = 1;
else opacity = value;
if (Parent != null)
Parent.Invalidate(Bounds, true);
}
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle = cp.ExStyle | 0x20;
return cp;
}
}
protected override void OnPaintBackground(PaintEventArgs e)
{
//do nothing
}
protected override void OnMove(EventArgs e)
{
RecreateHandle();
}
protected override void OnPaint(PaintEventArgs e)
{
using (Graphics g = e.Graphics)
{
Rectangle bounds = new Rectangle(0, 0, Width - 1, Height - 1);
int alpha = (opacity * 255) / 100;
using (Brush bckColor = new SolidBrush(Color.FromArgb(alpha, BackColor)))
{
if (BackColor != Color.Transparent)
g.FillRectangle(bckColor, bounds);
}
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.Matrix33 = (float)alpha / 255;
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
if (BackgroundImage != null)
g.DrawImage(BackgroundImage, bounds, 0, 0, Width, Height, GraphicsUnit.Pixel, imageAttr);
if (Text != string.Empty)
{
using (Brush txtBrush = new SolidBrush(Color.FromArgb(alpha, ForeColor)))
{
g.DrawString(Text, Font, txtBrush, 5, 5);
}
}
}
}
protected override void OnBackColorChanged(EventArgs e)
{
if (Parent != null)
Parent.Invalidate(Bounds, true);
base.OnBackColorChanged(e);
}
protected override void OnParentBackColorChanged(EventArgs e)
{
Invalidate();
base.OnParentBackColorChanged(e);
}
}
I've putted the control on a form which has a timer on it.
The timer set the control's opacity from 0 to 100 and back and its working well.
The problem I'm trying to solved is that the control flickers while changing its opacity.
Setting the control toControlStyles.DoubleBuffer will make the control invisible on the form.
Any advice will be welcome.

I was unable to use both a double buffer and WS_EX_TRANSPARENT (0x20) for the transparent background. So I decided to implement the transparent background by copying the content of the parent control and use double buffer to prevent flicker.
The following is the final source code, tested and working:
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
internal class FadeControl : Control
{
private int opacity = 100;
private Bitmap backgroundBuffer;
private bool skipPaint;
public FadeControl()
{
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.DoubleBuffer |
ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint, true);
}
public int Opacity
{
get
{
return opacity;
}
set
{
if (value > 100) opacity = 100;
else if (value < 1) opacity = 1;
else opacity = value;
if (Parent != null)
Parent.Invalidate(Bounds, true);
}
}
protected override void OnPaintBackground(PaintEventArgs e)
{
//do nothig
}
protected override void OnMove(EventArgs e)
{
RecreateHandle();
}
private void CreateBackgroundBuffer(Control parent)
{
int offsetX;
int offsetY;
GetOffsets(out offsetX, out offsetY, parent);
backgroundBuffer = new Bitmap(Width + offsetX, Height + offsetY);
}
protected override void OnResize(EventArgs e)
{
var parent = Parent;
if (parent != null)
{
CreateBackgroundBuffer(parent);
}
base.OnResize(e);
}
private void GetOffsets(out int offsetX, out int offsetY, Control parent)
{
var parentPosition = parent.PointToScreen(Point.Empty);
offsetY = Top + parentPosition.Y - parent.Top;
offsetX = Left + parentPosition.X - parent.Left;
}
private void UpdateBackgroundBuffer(int offsetX, int offsetY, Control parent)
{
if (backgroundBuffer == null)
{
CreateBackgroundBuffer(parent);
}
Rectangle parentBounds = new Rectangle(0, 0, Width + offsetX, Height + offsetY);
skipPaint = true;
parent.DrawToBitmap(backgroundBuffer, parentBounds);
skipPaint = false;
}
private void DrawBackground(Graphics graphics, Rectangle bounds)
{
int offsetX;
int offsetY;
var parent = Parent;
GetOffsets(out offsetX, out offsetY, parent);
UpdateBackgroundBuffer(offsetX, offsetY, parent);
graphics.DrawImage(backgroundBuffer, bounds, offsetX, offsetY, Width, Height, GraphicsUnit.Pixel);
}
private void Draw(Graphics graphics)
{
Rectangle bounds = new Rectangle(0, 0, Width, Height);
DrawBackground(graphics, bounds);
int alpha = (opacity * 255) / 100;
using (Brush bckColor = new SolidBrush(Color.FromArgb(alpha, BackColor)))
{
if (BackColor != Color.Transparent)
{
graphics.FillRectangle(bckColor, bounds);
}
}
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.Matrix33 = (float)alpha / 255;
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
if (BackgroundImage != null)
{
graphics.DrawImage(BackgroundImage, bounds, 0, 0, Width, Height, GraphicsUnit.Pixel, imageAttr);
}
if (Text != string.Empty)
{
using (Brush txtBrush = new SolidBrush(Color.FromArgb(alpha, ForeColor)))
{
graphics.DrawString(Text, Font, txtBrush, 5, 5);
}
}
}
protected override void OnPaint(PaintEventArgs e)
{
if (!skipPaint)
{
Graphics graphics = e.Graphics;
Draw(graphics);
}
}
protected override void OnBackColorChanged(EventArgs e)
{
if (Parent != null)
{
Parent.Invalidate(Bounds, true);
}
base.OnBackColorChanged(e);
}
protected override void OnParentBackColorChanged(EventArgs e)
{
Invalidate();
base.OnParentBackColorChanged(e);
}
}
Note that the method CreateParams is no longer present, also I've changed the contructor.
The field skipPaint is to know when not to paint in order to be able to able to tell the parent to draw itself to a bitmap during OnPaint without having infinite recursion.
backgroundBuffer is not to implement double buffering, but to keep a copy of the contents of the parent without the control rendered. It is updated each paint, I know there are more efficient solutions...* yet this approach keeps it simple and shouldn't be a bottleneck unless you have too many of these controls on the same container.
*: A better solution would be to update it each time the parent invalidates. Futhermore shared it among all the FadeControls in the same parent.

C# vertical label in a Windows Forms

Is it possible to display a label vertically in a Windows Forms?

Labels are easy, all you have to do is override the Paint event and draw the text vertically. Do note that GDI is optimised for Drawing text horizontally. If you rotate text (even if you rotate through multiples of 90 degrees) it will looks notably worse.
Perhaps the best thing to do is draw your text (or get a label to draw itself) onto a bitmap, then display the bitmap rotated.
Some C# code for drawing a Custom Control with vertical text. Note that ClearType text NEVER works if the text is not horizontal:
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
public partial class VerticalLabel : UserControl
{
public VerticalLabel()
{
InitializeComponent();
}
private void VerticalLabel_SizeChanged(object sender, EventArgs e)
{
GenerateTexture();
}
private void GenerateTexture()
{
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
format.Trimming = StringTrimming.EllipsisCharacter;
Bitmap img = new Bitmap(this.Height, this.Width);
Graphics G = Graphics.FromImage(img);
G.Clear(this.BackColor);
SolidBrush brush_text = new SolidBrush(this.ForeColor);
G.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
G.DrawString(this.Name, this.Font, brush_text, new Rectangle(0, 0, img.Width, img.Height), format);
brush_text.Dispose();
img.RotateFlip(RotateFlipType.Rotate270FlipNone);
this.BackgroundImage = img;
}
}

Create a class myLabel which can rotate it's Text on any angle specified by you.
You can use it by code or simply dragging from ToolBox
using System.Drawing;
class myLabel:System.Windows.Forms.Label
{
public int RotateAngle { get; set; } // to rotate your text
public string NewText { get; set; } // to draw text
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
Brush b =new SolidBrush(this.ForeColor);
e.Graphics.TranslateTransform(this.Width / 2, this.Height / 2);
e.Graphics.RotateTransform(this.RotateAngle);
e.Graphics.DrawString(this.NewText, this.Font,b , 0f, 0f);
base.OnPaint(e);
}
}
Now this custom control is used into your form.
You have to set below properties
1. mylbl.Text = ""; //which can be changed by NewText property
2. mylbl.AutoSize = false; // adjust according to your text
3. mylbl.NewText = "Hello"; // whatever you want to display
4. mylbl.ForeColor = Color.Red; // color to display
5. mylbl.RotateAngle = -90; //angle to rotate

I expanded on Javed Akram's answer to resize the widget automatically (I needed this feature). It works for both positive and negative angles, the way that Javed states:
1. mylbl.Text = ""; // which can be changed by NewText property
2. mylbl.AutoSize = false; // adjust according to your text
3. mylbl.NewText = "Hello"; // whatever you want to display
4. mylbl.ForeColor = Color.Red; // color to display
5. mylbl.RotateAngle = -90; // angle to rotate
Here is the code:
public class RotatingLabel : System.Windows.Forms.Label
{
private int m_RotateAngle = 0;
private string m_NewText = string.Empty;
public int RotateAngle { get { return m_RotateAngle; } set { m_RotateAngle = value; Invalidate(); } }
public string NewText { get { return m_NewText; } set { m_NewText = value; Invalidate(); } }
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
Func<double, double> DegToRad = (angle) => Math.PI * angle / 180.0;
Brush b = new SolidBrush(this.ForeColor);
SizeF size = e.Graphics.MeasureString(this.NewText, this.Font, this.Parent.Width);
int normalAngle = ((RotateAngle % 360) + 360) % 360;
double normaleRads = DegToRad(normalAngle);
int hSinTheta = (int)Math.Ceiling((size.Height * Math.Sin(normaleRads)));
int wCosTheta = (int)Math.Ceiling((size.Width * Math.Cos(normaleRads)));
int wSinTheta = (int)Math.Ceiling((size.Width * Math.Sin(normaleRads)));
int hCosTheta = (int)Math.Ceiling((size.Height * Math.Cos(normaleRads)));
int rotatedWidth = Math.Abs(hSinTheta) + Math.Abs(wCosTheta);
int rotatedHeight = Math.Abs(wSinTheta) + Math.Abs(hCosTheta);
this.Width = rotatedWidth;
this.Height = rotatedHeight;
int numQuadrants =
(normalAngle >= 0 && normalAngle < 90) ? 1 :
(normalAngle >= 90 && normalAngle < 180) ? 2 :
(normalAngle >= 180 && normalAngle < 270) ? 3 :
(normalAngle >= 270 && normalAngle < 360) ? 4 :
0;
int horizShift = 0;
int vertShift = 0;
if (numQuadrants == 1)
{
horizShift = Math.Abs(hSinTheta);
}
else if (numQuadrants == 2)
{
horizShift = rotatedWidth;
vertShift = Math.Abs(hCosTheta);
}
else if (numQuadrants == 3)
{
horizShift = Math.Abs(wCosTheta);
vertShift = rotatedHeight;
}
else if (numQuadrants == 4)
{
vertShift = Math.Abs(wSinTheta);
}
e.Graphics.TranslateTransform(horizShift, vertShift);
e.Graphics.RotateTransform(this.RotateAngle);
e.Graphics.DrawString(this.NewText, this.Font, b, 0f, 0f);
base.OnPaint(e);
}
}

I found a way to simply do it without adding code or classes to your project!
When you create your label, simply add:
this.label1.text = "V\nE\nR\nT\nI\nC\nA\nL\n";
This worked for me!

You can rotate text instead of the label control in the OnPaint event or Paint method:
private void uc1_Paint(object sender, PaintEventArgs e)
{
string Name;
var g = e.Graphics;
g.DrawString(Name, new Font("Tahoma", 8), Brushes.Black, 0, 0,
new StringFormat(StringFormatFlags.DirectionVertical));
}

2015 update on an old post. Since most of the other answers seem to heavily affect VS2013's designer in terms of usability, I'd suggest this solution:
http://www.codeproject.com/Articles/19774/Extended-Vertical-Label-Control-in-C-NET

It absolutely works. I found it on net and little changed
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.ComponentModel;
public class VerticalLabel : System.Windows.Forms.Label
{
private bool bFlip = true;
public VerticalLabel()
{
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.Trimming = StringTrimming.None;
stringFormat.FormatFlags = StringFormatFlags.DirectionVertical;
Brush textBrush = new SolidBrush(this.ForeColor);
Matrix storedState = g.Transform;
if (bFlip)
{
g.RotateTransform(180f);
g.TranslateTransform(-ClientRectangle.Width,-ClientRectangle.Height);
}
g.DrawString(
this.Text,
this.Font,
textBrush,
ClientRectangle,
stringFormat);
g.Transform = storedState;
}
[Description("When this parameter is true the VLabel flips at 180 degrees."),Category("Appearance")]
public bool Flip180
{
get
{
return bFlip;
}
set
{
bFlip = value;
this.Invalidate();
}
}
}

Used pieces from others
Jeremy
public partial class VerticalLabel_UserControl : UserControl
{
private IComponentChangeService _changeService;
private string strPropertyText = "Vertical Text";
public VerticalLabel_UserControl()
{
InitializeComponent();
}
[EditorBrowsable(EditorBrowsableState.Always)]
[Browsable(true)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[Bindable(true)]
public override string Text { get { return base.Text; } set { base.Text = value; this.Invalidate(); } }
private void VerticalLabel_UserControl_SizeChanged(object sender, EventArgs e)
{
GenerateTexture();
}
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
}
private void GenerateTexture()
{
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
// format.Trimming = StringTrimming.EllipsisCharacter;
Bitmap img = new Bitmap(this.Height, this.Width);
Graphics G = Graphics.FromImage(img);
G.Clear(this.BackColor);
SolidBrush brush_text = new SolidBrush(this.ForeColor);
G.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
G.DrawString(this.strPropertyText, this.Font, brush_text, new Rectangle(0, 0, img.Width, img.Height), format);
img.RotateFlip(RotateFlipType.Rotate270FlipNone);
this.BackgroundImage = img;
brush_text.Dispose();
}
public override System.ComponentModel.ISite Site
{
get
{
return base.Site;
}
set
{
_changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));
if (_changeService != null)
_changeService.ComponentChanged -= new ComponentChangedEventHandler(OnComponentChanged);
base.Site = value;
if (!DesignMode)
return;
_changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));
if (_changeService != null)
_changeService.ComponentChanged += new ComponentChangedEventHandler(OnComponentChanged);
}
}
private void OnComponentChanged(object sender, ComponentChangedEventArgs ce)
{
VerticalLabel_UserControl label = ce.Component as VerticalLabel_UserControl;
if (label == null || !label.DesignMode)
return;
if (((IComponent)ce.Component).Site == null || ce.Member == null || ce.Member.Name != "Text")
return;
//Causes the default text to be updated
string strName = this.Name.ToLower();
string strText = this.Text.ToLower();
if (strText.Contains(strName))
{
this.Text = "Vertical Text";
}
else
{
strPropertyText = this.Text;
}
//Prints the text vertically
GenerateTexture();
}
}

I just turned off the AutoSize property and resized the label vertically. I made the label wide enough for only one character. Then I changed TextAlign to center to make the alignment look better. This worked great for me.

How do I rotate a label in C#? [duplicate]

This question already has answers here:
C# vertical label in a Windows Forms
(9 answers)
Closed 9 years ago.
I want to show a label rotated 90 degrees (so I can put a bunch of them at the top of a table as the headings). Is there an easy way to do this?

You will need to write your own or use a custom control.
A The Code Project article you can start with is Customized Text - Orientated Controls in C# - Part I (Label Control). This contains extra functionality, so you should be able to trim it down if you'd like.
And here is some code from it that is of interest:
/// <summary>
/// This is a lable, in which you can set the text in any direction/angle
/// </summary>
#region Orientation
//Orientation of the text
public enum Orientation
{
Circle,
Arc,
Rotate
}
public enum Direction
{
Clockwise,
AntiClockwise
}
#endregion
public class OrientedTextLabel : System.Windows.Forms.Label
{
#region Variables
private double rotationAngle;
private string text;
private Orientation textOrientation;
private Direction textDirection;
#endregion
#region Constructor
public OrientedTextLabel()
{
//Setting the initial condition.
rotationAngle = 0d;
textOrientation = Orientation.Rotate;
this.Size = new Size(105,12);
}
#endregion
#region Properties
[Description("Rotation Angle"),Category("Appearance")]
public double RotationAngle
{
get
{
return rotationAngle;
}
set
{
rotationAngle = value;
this.Invalidate();
}
}
[Description("Kind of Text Orientation"),Category("Appearance")]
public Orientation TextOrientation
{
get
{
return textOrientation;
}
set
{
textOrientation = value;
this.Invalidate();
}
}
[Description("Direction of the Text"),Category("Appearance")]
public Direction TextDirection
{
get
{
return textDirection;
}
set
{
textDirection = value;
this.Invalidate();
}
}
[Description("Display Text"),Category("Appearance")]
public override string Text
{
get
{
return text;
}
set
{
text = value;
this.Invalidate();
}
}
#endregion
#region Method
protected override void OnPaint(PaintEventArgs e)
{
Graphics graphics = e.Graphics;
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.Trimming = StringTrimming.None;
Brush textBrush = new SolidBrush(this.ForeColor);
//Getting the width and height of the text, which we are going to write
float width = graphics.MeasureString(text,this.Font).Width;
float height = graphics.MeasureString(text,this.Font).Height;
//The radius is set to 0.9 of the width or height, b'cos not to
//hide and part of the text at any stage
float radius = 0f;
if (ClientRectangle.Width<ClientRectangle.Height)
{
radius = ClientRectangle.Width *0.9f/2;
}
else
{
radius = ClientRectangle.Height *0.9f/2;
}
//Setting the text according to the selection
switch (textOrientation)
{
case Orientation.Arc:
{
//Arc angle must be get from the length of the text.
float arcAngle = (2*width/radius)/text.Length;
if(textDirection == Direction.Clockwise)
{
for (int i=0; i<text.Length; i++)
{
graphics.TranslateTransform(
(float)(radius*(1 - Math.Cos(arcAngle*i + rotationAngle/180 * Math.PI))),
(float)(radius*(1 - Math.Sin(arcAngle*i + rotationAngle/180*Math.PI))));
graphics.RotateTransform((-90 + (float)rotationAngle + 180*arcAngle*i/(float)Math.PI));
graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0);
graphics.ResetTransform();
}
}
else
{
for (int i=0; i<text.Length; i++)
{
graphics.TranslateTransform(
(float)(radius*(1 - Math.Cos(arcAngle*i + rotationAngle/180*Math.PI))),
(float)(radius*(1 + Math.Sin(arcAngle*i + rotationAngle/180*Math.PI))));
graphics.RotateTransform((-90 - (float)rotationAngle - 180*arcAngle*i/(float)Math.PI));
graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0);
graphics.ResetTransform();
}
}
break;
}
case Orientation.Circle:
{
if (textDirection == Direction.Clockwise)
{
for(int i=0;i<text.Length;i++)
{
graphics.TranslateTransform(
(float)(radius*(1 - Math.Cos((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI))),
(float)(radius*(1 - Math.Sin((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI))));
graphics.RotateTransform(-90 + (float)rotationAngle + (360/text.Length)*i);
graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0);
graphics.ResetTransform();
}
}
else
{
for(int i=0;i<text.Length;i++)
{
graphics.TranslateTransform(
(float)(radius*(1 - Math.Cos((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI))),
(float)(radius*(1 + Math.Sin((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI))));
graphics.RotateTransform(-90 - (float)rotationAngle - (360/text.Length)*i);
graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0);
graphics.ResetTransform();
}
}
break;
}
case Orientation.Rotate:
{
//For rotation, who about rotation?
double angle = (rotationAngle/180)*Math.PI;
graphics.TranslateTransform(
(ClientRectangle.Width+(float)(height*Math.Sin(angle))-(float)(width*Math.Cos(angle)))/2,
(ClientRectangle.Height-(float)(height*Math.Cos(angle))-(float)(width*Math.Sin(angle)))/2);
graphics.RotateTransform((float)rotationAngle);
graphics.DrawString(text,this.Font,textBrush,0,0);
graphics.ResetTransform();
break;
}
}
}
#endregion
}

You can also take a look at the Windows ToolStrip control. It has an option for TextDirection that can be set to Vertical90 or Vertical270 and this will rotate your Label text in the appropriate direction.
Overview: ToolStrip Class (MSDN)
Setting the property (learn.microsoft.com)
Enumerated Values (learn.microsoft.com)

namespace doesn't exist

I would like to try out a code in Microsoft Visual C# Express Edition and I'm getting this error:
The type or namespace name 'Properties' does not exist in the namespace 'EducationalSuite.Core' (are you missing an assembly reference?)
I right click the Reference but I didn't find the "Properties" either the "EducationalSuite.Core".
Here is the code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Text;
using System.Windows.Forms;
using System.Media;
using System.Resources;
namespace EducationalSuite.Core.Plugins
{
public delegate void RectangleItemClickedDelegate(Rectangle rect, int index);
public partial class GeoSafariItem : Control
{
protected List<Rectangle> lastFlashingItems = new List<Rectangle>();
protected int lastHeight = 0;
private Image imageFile = null;
protected List<Rectangle> hotspots = new List<Rectangle>();
protected Dictionary<int, string> textItems = new Dictionary<int, string>();
protected Dictionary<int, FileInfo> audioItems = new Dictionary<int, FileInfo>();
protected Rectangle lastRectangle;
protected int selectedIndex = 0;
protected int countItemsLeft = 6;
protected int countItemsRight = 6;
protected int imageOffsetTop = 0;
protected int imageOffsetBottom = 0;
protected bool paintHotSpots = false, colorSwitch = false, paintItemLabels = false;
protected Timer timer = new Timer();
public event RectangleItemClickedDelegate HotspotClick;
public event RectangleItemClickedDelegate QuestionItemClick;
public event RectangleItemClickedDelegate QuestionItemRightClick;
protected void OnHotspotClick(Rectangle rect, int index)
{
if (HotspotClick != null)
{
HotspotClick(this.RectangleToScreen(rect), index);
}
}
protected void OnQuestionItemRightClick(Rectangle rect, int index)
{
if (QuestionItemRightClick != null)
{
QuestionItemRightClick(this.RectangleToScreen(rect), index);
}
}
protected void OnQuestionItemClick(Rectangle rect, int index)
{
if (QuestionItemClick != null)
{
QuestionItemClick(this.RectangleToScreen(rect), index);
}
}
public GeoSafariItem()
{
this.imageFile = EducationalSuite.Core.Properties.Resources.singlepixel;
timer.Interval = 100;
timer.Tick += new EventHandler(timer_Tick);
timer.Enabled = true;
this.MouseUp += new MouseEventHandler(GeoSafariItem_MouseUp);
// Activates double buffering
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
this.DoubleBuffered = true;
//InitializeComponent();
}
public void SetItemText(int index, string text)
{
if (string.IsNullOrEmpty(text))
{
if (this.textItems.ContainsKey(index)) textItems.Remove(index);
}
else
{
this.textItems[index] = text;
}
if (PaintItemLabels)
{
this.Invalidate();
}
}
public string GetItemText(int index)
{
if (this.textItems.ContainsKey(index))
{
return this.textItems[index];
}
else
{
return string.Empty;
}
}
public void SetItemAudio(int index, FileInfo file)
{
if ((file == null) && !file.Exists)
{
if (this.audioItems.ContainsKey(index)) audioItems.Remove(index);
}
else
{
this.audioItems[index] = file;
}
}
public FileInfo GetItemAudio(int index)
{
if (this.audioItems.ContainsKey(index))
{
return this.audioItems[index];
}
else
{
return null;
}
}
#region Recording Regions
bool isRecording = false;
int recordingIndex = 0;
Point recordTopLeft = Point.Empty;
Point recordBottomRight = Point.Empty;
List<Rectangle> recordedRectangles = new List<Rectangle>();
public void StartRecording()
{
isRecording = true;
recordingIndex = 0;
selectedIndex = 0;
recordedRectangles.Clear();
this.MouseUp += new MouseEventHandler(GeoSafariItemRecord_MouseUp);
this.Invalidate();
}
public List<Rectangle> FinishRecording()
{
isRecording = false;
this.MouseUp -= new MouseEventHandler(GeoSafariItemRecord_MouseUp);
this.Invalidate();
this.Hotspots.Clear();
foreach (Rectangle r in recordedRectangles)
{
this.Hotspots.Add(r);
}
return recordedRectangles;
}
private void GeoSafariItemRecord_MouseUp(object sender, MouseEventArgs e)
{
if (isRecording)
{
Rectangle size = SizeRect;
double ratio = (double)imageFile.Height / (double)size.Height;
if (recordTopLeft == Point.Empty)
{
recordTopLeft = new Point(
(int)(((double)e.Location.X - (double)size.Left) * ratio),
(int)(((double)e.Location.Y - (double)size.Top) * ratio)
);
}
else
{
recordBottomRight = new Point(
(int)(((double)e.Location.X - (double)size.Left) * ratio),
(int)(((double)e.Location.Y - (double)size.Top) * ratio)
);
Rectangle r = new Rectangle(recordTopLeft,
new Size(recordBottomRight.X - recordTopLeft.X, recordBottomRight.Y - recordTopLeft.Y));
this.recordedRectangles.Add(r);
recordingIndex++;
selectedIndex++;
recordTopLeft = Point.Empty;
recordBottomRight = Point.Empty;
}
}
this.Invalidate();
}
#endregion
void timer_Tick(object sender, EventArgs e)
{
colorSwitch = !colorSwitch;
if (lastRectangle.Width > 0)
{
this.Invalidate(lastRectangle);
}
else
{
this.Invalidate();
}
}
private Rectangle SizeRect
{
get
{
int rw, rh,
cw = (this.Width - 42),
ch = (this.Height - 2),
ox = 21,
oy = 1;
rw = cw;
rh = ch;
double imageRatio = (double)imageFile.Width / (double)imageFile.Height;
double controlRatio = (double)cw / (double)ch;
if (controlRatio > imageRatio)
{
rw = (int)Math.Round((double)rh * imageRatio);
ox += Math.Abs(rw - cw) / 2;
}
else if (controlRatio < imageRatio)
{
rh = (int)Math.Round((double)rw / imageRatio);
oy += Math.Abs(rh - ch) / 2;
}
return new Rectangle(ox, oy, rw, rh);
}
}
void GeoSafariItem_MouseUp(object sender, MouseEventArgs e)
{
Rectangle size = SizeRect;
for (int i = 0; i < hotspots.Count; i++)
{
Rectangle hotspot = hotspots[i];
double ratio = (double)size.Height / (double)imageFile.Height;
Rectangle adjustedRectange = new Rectangle(
size.Left + (int)(hotspot.X * ratio),
size.Top + (int)(hotspot.Y * ratio),
(int)(hotspot.Width * ratio),
(int)(hotspot.Height * ratio));
if (adjustedRectange.Contains(e.Location))
{
OnHotspotClick(hotspot, i);
return;
}
}
for (int i = 0; i < lastFlashingItems.Count; i++)
{
if (lastFlashingItems[i].Contains(e.Location))
{
if (e.Button == MouseButtons.Right)
OnQuestionItemRightClick(lastFlashingItems[i], i);
else
OnQuestionItemClick(lastFlashingItems[i], i);
return;
}
}
}
public List<Rectangle> Hotspots
{
get { return hotspots; }
}
public Image ImageFile
{
get { return imageFile; }
set
{
imageFile = value;
lastFlashingItems.Clear();
this.Invalidate();
}
}
public int SelectedIndex
{
get { return selectedIndex; }
set { selectedIndex = value; this.Invalidate(); }
}
public int CountItemsLeft
{
get { return countItemsLeft; }
set
{
countItemsLeft = value;
lastFlashingItems.Clear();
this.Invalidate();
}
}
public int CountItemsRight
{
get { return countItemsRight; }
set
{
countItemsRight = value;
lastFlashingItems.Clear();
this.Invalidate();
}
}
public int ImageOffsetTop
{
get { return imageOffsetTop; }
set
{
imageOffsetTop = value;
lastFlashingItems.Clear();
this.Invalidate();
}
}
public int ImageOffsetBottom
{
get { return imageOffsetBottom; }
set
{
imageOffsetBottom = value;
lastFlashingItems.Clear();
this.Invalidate();
}
}
public bool PaintHotSpots
{
get { return paintHotSpots; }
set { paintHotSpots = value; this.Invalidate(); }
}
public bool PaintItemLabels
{
get { return paintItemLabels; }
set { paintItemLabels = value; this.Invalidate(); }
}
protected override void OnPaint(PaintEventArgs pe)
{
Graphics g = pe.Graphics;
string itemText;
SizeF sizeItemText;
double topOffset = imageOffsetTop;
double bottomOffset = imageOffsetBottom;
double topOffsetPct = (double)topOffset / (double)imageFile.Height;
double bottomOffsetPct = (double)bottomOffset / (double)imageFile.Height;
Rectangle size = SizeRect;
SolidBrush brush = new SolidBrush(this.BackColor);
g.FillRectangle(brush, 0, 0, this.Width - 1, this.Height - 1);
g.FillRectangle(Brushes.Ivory, size.X - 25, size.Y, size.Width + 50, size.Height);
g.DrawRectangle(Pens.DarkKhaki, size.X - 25, size.Y - 1, size.Width + 50, size.Height + 1);
g.DrawImage(imageFile, size.X, size.Y, size.Width, size.Height);
Rectangle rect, rectItemText;
Brush selectedColor = (colorSwitch ? Brushes.Crimson : Brushes.Red);
topOffset = topOffsetPct * size.Height;
bottomOffset = bottomOffsetPct * size.Height;
int tmpHeight = (size.Height - (int)topOffset - (int)bottomOffset) / countItemsLeft;
if (size.Height != this.lastHeight || this.lastFlashingItems.Count == 0)
{
lastHeight = size.Height;
lastFlashingItems.Clear();
int actualIndex = 0;
for (int i = 0; i < countItemsLeft; i++)
{
int yy = size.Y + (tmpHeight * i) + (int)topOffset;
int xx = size.X - 18;
rect = new Rectangle(xx, yy, 16, 8);
this.lastFlashingItems.Add(rect);
g.FillRectangle((actualIndex == selectedIndex ? selectedColor : Brushes.Khaki), rect);
g.DrawRectangle(Pens.DarkKhaki, rect);
if (actualIndex == selectedIndex)
{
lastRectangle = rect;
}
itemText = this.GetItemText(actualIndex);
if (PaintItemLabels && !string.IsNullOrEmpty(itemText))
{
// Draw Text next to each notch
sizeItemText = g.MeasureString(itemText, this.Font);
int xxx = size.X + 10;
rectItemText = new Rectangle(xxx, yy, Convert.ToInt32(sizeItemText.Width), Convert.ToInt32(sizeItemText.Height));
PaintHotspot(g, Color.White, rectItemText, 200);
g.DrawString(itemText, this.Font, Brushes.Black, (float)xxx, (float)yy);
}
actualIndex++;
}
tmpHeight = (size.Height - (int)topOffset - (int)bottomOffset) / countItemsRight;
for (int i = 0; i < countItemsRight; i++)
{
int yy = size.Y + (tmpHeight * i) + (int)topOffset;
int xx = size.X + size.Width + 2;
rect = new Rectangle(xx, yy, 16, 8);
this.lastFlashingItems.Add(rect);
g.FillRectangle((actualIndex == selectedIndex ? selectedColor : Brushes.Khaki), rect);
g.DrawRectangle(Pens.DarkKhaki, rect);
if (actualIndex == selectedIndex)
{
lastRectangle = rect;
}
itemText = this.GetItemText(actualIndex);
if (PaintItemLabels && !string.IsNullOrEmpty(itemText))
{
// Draw Text next to each notch
sizeItemText = g.MeasureString(itemText, this.Font);
int xxx = size.X + size.Width - 10 - Convert.ToInt32(sizeItemText.Width);
rectItemText = new Rectangle(xxx, yy, Convert.ToInt32(sizeItemText.Width), Convert.ToInt32(sizeItemText.Height));
PaintHotspot(g, Color.White, rectItemText, 200);
g.DrawString(itemText, this.Font, Brushes.Black, (float)xxx, (float)yy);
}
actualIndex++;
}
}
else
{
lastHeight = size.Height;
for (int i = 0; i < lastFlashingItems.Count; i++)
{
g.FillRectangle((i == selectedIndex ? selectedColor : Brushes.Khaki), lastFlashingItems[i]);
g.DrawRectangle(Pens.DarkKhaki, lastFlashingItems[i]);
if (i == selectedIndex)
{
lastRectangle = lastFlashingItems[i];
}
}
if (PaintItemLabels)
{
int actualIndex = 0;
for (int i = 0; i < countItemsLeft; i++)
{
itemText = this.GetItemText(actualIndex);
if (!string.IsNullOrEmpty(itemText))
{
int yy = size.Y + (tmpHeight * i) + (int)topOffset;
// Draw Text next to each notch
sizeItemText = g.MeasureString(itemText, this.Font);
int xxx = size.X + 10;
rectItemText = new Rectangle(xxx, yy, Convert.ToInt32(sizeItemText.Width), Convert.ToInt32(sizeItemText.Height));
PaintHotspot(g, Color.White, rectItemText, 200);
g.DrawString(itemText, this.Font, Brushes.Black, (float)xxx, (float)yy);
}
actualIndex++;
}
tmpHeight = (size.Height - (int)topOffset - (int)bottomOffset) / countItemsRight;
for (int i = 0; i < countItemsRight; i++)
{
itemText = this.GetItemText(actualIndex);
if (!string.IsNullOrEmpty(itemText))
{
int yy = size.Y + (tmpHeight * i) + (int)topOffset;
// Draw Text next to each notch
sizeItemText = g.MeasureString(itemText, this.Font);
int xxx = size.X + size.Width - 10 - Convert.ToInt32(sizeItemText.Width);
rectItemText = new Rectangle(xxx, yy, Convert.ToInt32(sizeItemText.Width), Convert.ToInt32(sizeItemText.Height));
PaintHotspot(g, Color.White, rectItemText, 200);
g.DrawString(itemText, this.Font, Brushes.Black, (float)xxx, (float)yy);
}
actualIndex++;
}
}
}
// Calling the base class OnPaint
base.OnPaint(pe);
if (this.isRecording)
{
for (int i = 0; i < this.recordedRectangles.Count; i++)
{
rect = recordedRectangles[i];
double ratio = (double)size.Height / (double)imageFile.Height;
Rectangle adjustedRectange = new Rectangle(
size.Left + (int)(rect.X * ratio),
size.Top + (int)(rect.Y * ratio),
(int)(rect.Width * ratio),
(int)(rect.Height * ratio));
PaintHotspot(g, Color.LightBlue, adjustedRectange, (i + 1).ToString());
}
}
else if (this.paintHotSpots)
{
for (int i = 0; i < hotspots.Count; i++)
{
Rectangle hotspot = hotspots[i];
double ratio = (double)size.Height / (double)imageFile.Height;
Rectangle adjustedRectange = new Rectangle(
size.Left + (int)(hotspot.X * ratio),
size.Top + (int)(hotspot.Y * ratio),
(int)(hotspot.Width * ratio),
(int)(hotspot.Height * ratio));
PaintHotspot(g, Color.LightGreen, adjustedRectange, (i + 1).ToString());
}
}
}
protected virtual void PaintHotspot(Graphics g, Color c, Rectangle hotspot, int alpha)
{
PaintHotspot(g, c, hotspot, alpha, null);
}
protected virtual void PaintHotspot(Graphics g, Color c, Rectangle hotspot, string txt)
{
PaintHotspot(g, c, hotspot, 100, txt);
}
protected virtual void PaintHotspot(Graphics g, Color c, Rectangle hotspot, int alpha, string txt)
{
SolidBrush brush = new SolidBrush(Color.FromArgb(alpha, c));
g.FillRectangle(brush, hotspot);
if (!string.IsNullOrEmpty(txt))
g.DrawString(txt, this.Font, Brushes.DarkGreen, hotspot.Location);
}
}
}

Update
I imagine the following line is causing the error.
this.imageFile = EducationalSuite.Core.Properties.Resources.singlepixel;
The code is referring to a image resource "singlepixel". This image must be in the default resource file of the EducationalSuite.Core assembly. First confirm that you are currently editing the said assembly by opening Project Properties and checking the Default Namespace on the Application page. This should state "EducationalSuite.Core". If this isn't the case, you are most likely missing a reference to the said assembly.
If you have the EducationalSuite.Core project open the easiest way to add the singlepixel resource is to open project properties, Resources tab and creating a new default resource file. From the top open the Add Resource drop down and select existing file or new image depending on whether you have the file already or if you need to create it. Name the resource "singlepixel".
Visual Studio will generate Resources helper class under Properties namespace for you so you can access the resource through the Properties.Resources.singlepixel under EducationalSuite.Core in your code.
Old answer
In general Properties namespace is the namespace which contains application or user specific settings. You can add these settings (and the namespace) by navigating to the Settings tab in the Properties of the project.
Unfortunately it's kind of hard to say more based on this information. Could you provide the piece of code that causes this error?
If you double click the error message the IDE will take you to the line which is causing the error.
Most likely the piece of code is expecting a setting variable which is not added to the project.

Looks like you are missing the Reference. If it is not under References in solution explorer than I would do a file search in windows for "EducationalSuite.Core" to see where it is on the system and add it. You may also be missing the "using" statement? If you hover over the "Properties" text you should get a small drop down that will add the using's for you.
If this does not help, more information would be helpful?
Hope this helps!