How to rotate the label?

Question

Windows application C#. I need to set the label Orientation as 90,180,270 on run time. How to rotate the label?

Sachin Singh · Answer

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); }

Rajanikant Hawaldar · Answer

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 (normalAngle >= 90 && normalAngle (normalAngle >= 180 && normalAngle (normalAngle >= 270 && normalAngle 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); } } }

Tamil Rk · Answer

@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.

How to rotate the label?

Answers (3)