How to rotate the label?

Hi Tamil Rk, i made sample app go through code.

Code behind .cs code:

using System;
using System.Windows.Forms;
namespace wfRotateLabel
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
this.label1.RotateAngle = Convert.ToInt32(textBox1.Text);
this.Invalidate();
}
}
}

Designer.cs code:

using System.Drawing;
namespace wfRotateLabel
{
partial class Form1
{
///
/// Required designer variable.
///
private System.ComponentModel.IContainer components = null;
///
/// Clean up any resources being used.
///
/// true if managed resources should be disposed; otherwise, false.
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.label1 = new wfRotateLabel.myLabel();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(54, 228);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(197, 30);
this.button1.TabIndex = 1;
this.button1.Text = "Change Orientation";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(54, 174);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(186, 26);
this.textBox1.TabIndex = 2;
//
// label1
//
this.label1.ForeColor = System.Drawing.Color.Red;
this.label1.Location = new System.Drawing.Point(60, 52);
this.label1.Name = "label1";
this.label1.NewText = "Hello";
this.label1.RotateAngle = -90;
this.label1.Size = new System.Drawing.Size(20, 43);
this.label1.TabIndex = 0;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(328, 321);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button1);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private wfRotateLabel.myLabel label1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
}
}

Below is customized label control class.

using System;
using System.Drawing;
namespace wfRotateLabel
{
class myLabel : 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);
}
}
}

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Tamil Rk5y ago
@Rajanikant Hawaldar, @Sachin Singh
Thanks for responding, I used the Telerik label and achieved it in one line code.

I tried both of your code but not work on only my requirement based implementation.
0
Sachin Singh5y ago
you can proceed something like below
private void Form1_Load(object sender, EventArgs e)
      {
          pt = new Point(30, 10);
           deg = 90;
               label1.Refresh();
      }

      private void label1_Paint(object sender, PaintEventArgs e)
      {

          e.Graphics.TranslateTransform(pt.X, pt.Y);
          e.Graphics.RotateTransform(deg);//set rotation
          e.Graphics.DrawString("Label1", myFont, myBrush, 0,0);
      }
+1
Rajanikant Hawaldar5y ago
Hi Tamil Rk, i made sample app go through code.

Code behind .cs code:
using System;
using System.Windows.Forms;
namespace wfRotateLabel
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            this.label1.RotateAngle = Convert.ToInt32(textBox1.Text);
            this.Invalidate();
        }
    }
}
Designer.cs code:
using System.Drawing;
namespace wfRotateLabel
{
    partial class Form1
    {
        ///

        /// Required designer variable.
        ///
        private System.ComponentModel.IContainer components = null;
        ///

        /// Clean up any resources being used.
        ///
        /// true if managed resources should be disposed; otherwise, false.
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
        #region Windows Form Designer generated code
        ///

        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        ///
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label1 = new wfRotateLabel.myLabel();
            this.SuspendLayout();
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(54, 228);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(197, 30);
            this.button1.TabIndex = 1;
            this.button1.Text = "Change Orientation";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // textBox1
            //
            this.textBox1.Location = new System.Drawing.Point(54, 174);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(186, 26);
            this.textBox1.TabIndex = 2;
            //
            // label1
            //
            this.label1.ForeColor = System.Drawing.Color.Red;
            this.label1.Location = new System.Drawing.Point(60, 52);
            this.label1.Name = "label1";
            this.label1.NewText = "Hello";
            this.label1.RotateAngle = -90;
            this.label1.Size = new System.Drawing.Size(20, 43);
            this.label1.TabIndex = 0;
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(328, 321);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();

        }
        #endregion
        private wfRotateLabel.myLabel label1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox textBox1;
    }
}
Below is customized label control class.
using System;
using System.Drawing;
namespace wfRotateLabel
{
    class myLabel : 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);
        }
    }
}
+1