Fill 50% of a drawing with a color

[r9]

Hi. Can someone show me how to fill 50% of the below drawing with a solid color. From buttom to top. Thanks Regards r9 The drawing: private System.Drawing.Graphics graphicsObj = null; private System.Drawing.Pen penBlackWidth1 = new System.Drawing.Pen(System.Drawing.Color.Black,1); private Point[] curvePoints = null; private SolidBrush lightGrayBrush = new SolidBrush(Color.LightGray); private Point point1; private Point point2; private Point point3; private Point point4; private SolidBrush blackBrush = new SolidBrush(Color.Black); ................................................... try { graphicsObj = e.Graphics; graphicsObj.DrawLine(penBlackWidth1, 45, 20, 175, 20); graphicsObj.DrawLine(penBlackWidth1, 45, 20, 45, 120); graphicsObj.DrawLine(penBlackWidth1, 175, 20, 175, 120); graphicsObj.DrawLine(penBlackWidth1, 45,120,90,160); graphicsObj.DrawLine(penBlackWidth1, 175, 120, 135, 160); graphicsObj.DrawLine(penBlackWidth1, 90, 160, 135, 160); graphicsObj.DrawLine(penBlackWidth1, 465, 335, 490, 335); graphicsObj.DrawLine(penBlackWidth1, 580, 335, 605, 335); graphicsObj.DrawLine(penBlackWidth1, 465, 335, 490, 335); graphicsObj.DrawLine(penBlackWidth1, 580, 335, 605, 335); graphicsObj.DrawLine(penBlackWidth1, 473, 345, 483, 345); graphicsObj.DrawLine(penBlackWidth1, 473, 345, 478, 335); graphicsObj.DrawLine(penBlackWidth1, 483, 345, 478, 335); graphicsObj.DrawLine(penBlackWidth1, 587, 345, 597, 345); graphicsObj.DrawLine(penBlackWidth1, 587, 345, 592, 335); graphicsObj.DrawLine(penBlackWidth1, 597, 345, 592, 335); point1 = new Point(592,335); point2 = new Point(597,345); point3 = new Point(587,345); point4 = new Point(592,335); curvePoints = new Point[] { point1,point2, point3, point4 }; graphicsObj.FillPolygon(blackBrush, curvePoints, FillMode.Alternate); point1 = new Point(478,335); point2 = new Point(483,345); point3 = new Point(473,345); point4 = new Point(478,335); curvePoints = new Point[] { point1,point2, point3, point4 }; graphicsObj.FillPolygon(blackBrush, curvePoints, FillMode.Alternate); } catch (Exception ex) { MessageBox.Show(ex.Message); }

[Heath Stewart]

Here's a though - look in your mathematics book. If you want exactly 50%, then find the algorithm given specified polygram. This is a forum for C#, not math.

Microsoft MVP, Visual C# My Articles

[r9]

Hi Heath Stewart The algorithm is not the problem. But how do I fill the figure? (the C# GDI+ code is my problem) Regards C#

[Heath Stewart]

Looking at the Graphics class, the logical choices are FillPolygon, FillPath, or FillRegion. Full class documentation - it's a great thing to read.

Microsoft MVP, Visual C# My Articles

[je_gonzalez]

This code creates a control (based on the Panel) with a new property named "Colors". Setting the property yo an array of colors will display the colors. (example: multiColorPanel1.Colors = new Color[] { Color.Red, Color.White, Color.Blue}; end of example) using System; using System.Collections; using System.ComponentModel; using System.Drawing; using System.Data; using System.Windows.Forms; namespace Project1 { /// /// Summary description for MultiColorPanel. /// public class MultiColorPanel : System.Windows.Forms.Panel { private Color[] colors = null; /// /// Required designer variable. /// private System.ComponentModel.Container components = null; public MultiColorPanel() { // This call is required by the Windows.Forms Form Designer. InitializeComponent(); // TODO: Add any initialization after the InitializeComponent call } /// /// Clean up any resources being used. /// protected override void Dispose( bool disposing ) { if( disposing ) { if(components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Component Designer generated code /// /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// private void InitializeComponent() { components = new System.ComponentModel.Container(); } #endregion public Color[] Colors { get { return colors; } set { colors = value; this.Invalidate(); } } protected override void OnPaintBackground(PaintEventArgs pevent) { if ((colors != null) && (colors.Length > 0)) { Graphics area = pevent.Graphics; int height = this.Height / colors.Length; for (int index = 0; index < colors.Length; index++) { Rectangle rect = new Rectangle(0, height * index, this.Width, this.Height); Brush brush = new SolidBrush(colors[index]); pevent.Graphics.FillRectangle(brush, rect); } } else { base.OnPaintBackground (pevent); } } } }