■ 데카르트 좌표계를 사용하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Drawing; using System.Windows.Forms; namespace TestProject { public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 선 그리기 가능 여부 /// </summary> private bool canDrawLine = false; /// <summary> /// A 값 /// </summary> private int aValue; /// <summary> /// B 값 /// </summary> private int bValue; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.drawButton.Click += drawButton_Click; this.drawPanel.Paint += drawPanel_Paint; this.SizeChanged += Form_SizeChanged; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 폼 크기 변경시 처리하기 - Form_SizeChanged(sender, e) /// <summary> /// 폼 크기 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_SizeChanged(object sender, EventArgs e) { this.drawPanel.Invalidate(); } #endregion #region Draw 버튼 클릭시 처리하기 - drawButton_Click(sender, e) /// <summary> /// Draw 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void drawButton_Click(object sender, EventArgs e) { #region a 값을 구한다. string aString = aTextBox.Text.Trim(); if(string.IsNullOrEmpty(aString)) { this.canDrawLine = false; this.drawPanel.Invalidate(); MessageBox.Show("A 항목에 값을 입력해 주시기 바랍니다."); return; } int aValue; if(!int.TryParse(aString, out aValue)) { this.canDrawLine = false; this.drawPanel.Invalidate(); MessageBox.Show("A 항목에 정수 값을 입력해 주시기 바랍니다."); return; } #endregion #region b 값을 구한다. string bString = bTextBox.Text.Trim(); if(string.IsNullOrEmpty(bString)) { this.canDrawLine = false; this.drawPanel.Invalidate(); MessageBox.Show("B 항목에 값을 입력해 주시기 바랍니다."); return; } int bValue; if(!int.TryParse(bString, out bValue)) { this.canDrawLine = false; this.drawPanel.Invalidate(); MessageBox.Show("B 항목에 정수 값을 입력해 주시기 바랍니다."); return; } #endregion this.canDrawLine = true; this.aValue = aValue; this.bValue = bValue; this.drawPanel.Invalidate(); } #endregion #region 그리기 패널 PAINT 처리하기 - drawPanel_Paint(sender, e) /// <summary> /// 그리기 패널 PAINT 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void drawPanel_Paint(object sender, PaintEventArgs e) { Panel panel = sender as Panel; Graphics graphics = e.Graphics; int halfWidth = drawPanel.ClientRectangle.Width / 2; int halfHeight = drawPanel.ClientRectangle.Height / 2; e.Graphics.TranslateTransform(halfWidth, halfHeight); e.Graphics.ScaleTransform(1, -1); // 수평선을 그린다. graphics.DrawLine(Pens.DarkGray, -halfWidth, 0, halfWidth, 0); graphics.DrawLine(Pens.DarkGray, -halfWidth, 0, -halfWidth + 5, 5); graphics.DrawLine(Pens.DarkGray, -halfWidth, 0, -halfWidth + 5, -5); graphics.DrawLine(Pens.DarkGray, halfWidth, 0, halfWidth - 5, 5); graphics.DrawLine(Pens.DarkGray, halfWidth, 0, halfWidth - 5, -5); // 수평선 눈금을 그린다. for(int i = 0; i < halfWidth; i += 10) { graphics.DrawLine(Pens.DarkGray, i, 3, i, -3); graphics.DrawLine(Pens.DarkGray, -i, 3, -i, -3); } // 수직선을 그린다. graphics.DrawLine(Pens.DarkGray, 0, halfHeight, 0, -halfHeight); graphics.DrawLine(Pens.DarkGray, 0, halfHeight, -5, halfHeight - 5); graphics.DrawLine(Pens.DarkGray, 0, halfHeight, 5, halfHeight - 5); graphics.DrawLine(Pens.DarkGray, 0, -halfHeight, -5, -halfHeight + 5); graphics.DrawLine(Pens.DarkGray, 0, -halfHeight, 5, -halfHeight + 5); // 수직선 눈금을 그린다. for(int i = 0; i < halfHeight; i += 10) { graphics.DrawLine(Pens.DarkGray, -3, i, 3, i); graphics.DrawLine(Pens.DarkGray, -3, -i, 3, -i); } // 1차 방정식에 따라 선을 그린다. if(this.canDrawLine) { int x1 = -halfWidth; int y1 = this.aValue * x1 + this.bValue; int x2 = halfWidth; int y2 = this.aValue * x2 + this.bValue; graphics.DrawLine(Pens.Red, x1, y1, x2, y2); } } #endregion } } |
