ShapeObject.cs

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;
using FastReport.Utils;
using System.Linq;

namespace FastReport
{
    /// <summary>
    /// Specifies a kind of the shape.
    /// </summary>
    public enum ShapeKind
    {
        /// <summary>
        /// Specifies a rectangle shape.
        /// </summary>
        Rectangle,

        /// <summary>
        /// Specifies a round rectangle shape.
        /// </summary>
        RoundRectangle,

        /// <summary>
        /// Specifies an ellipse shape.
        /// </summary>
        Ellipse,

        /// <summary>
        /// Specifies a triangle shape.
        /// </summary>
        Triangle,

        /// <summary>
        /// Specifies a diamond shape.
        /// </summary>
        Diamond
    }

    /// <summary>
    /// Represents a shape object.
    /// </summary>
    /// <remarks>
    /// Use the <see cref="ShapeKind"/> property to specify a shape. To set the width, style and color of the
    /// shape's border, use the <b>Border.Width</b>, <b>Border.Style</b> and <b>Border.Color</b> properties.
    /// </remarks>
    public partial class ShapeObject : ReportComponentBase
    {
        #region Fields
        private ShapeKind shape;
        private float curve;
        private FloatCollection dashPattern;
        #endregion

        #region Properties
        /// <summary>
        /// Gets or sets collection of values for custom dash pattern.
        /// </summary>
        /// <remarks>
        /// Each element should be a non-zero positive number. 
        /// If the number is negative or zero, that number is replaced by one.
        /// </remarks>
        [Category("Appearance")]
        public FloatCollection DashPattern
        {
            get { return dashPattern; }
            set { dashPattern = value; }
        }

        /// <summary>
        /// Gets or sets a shape kind.
        /// </summary>
        [DefaultValue(ShapeKind.Rectangle)]
        [Category("Appearance")]
        public ShapeKind Shape
        {
            get { return shape; }
            set { shape = value; }
        }

        /// <summary>
        /// Gets or sets a shape curvature if <see cref="ShapeKind"/> is <b>RoundRectangle</b>.
        /// </summary>
        /// <remarks>
        /// 0 value means automatic curvature.
        /// </remarks>
        [DefaultValue(0f)]
        [Category("Appearance")]
        public float Curve
        {
            get { return curve; }
            set { curve = value; }
        }

        #endregion

        #region Private Methods
        private GraphicsPath GetRoundRectPath(float x, float y, float x1, float y1, float radius)
        {
            GraphicsPath gp = new GraphicsPath();
            if (radius < 1)
                radius = 1;
            gp.AddArc(x1 - radius, y, radius, radius, 270, 90);
            gp.AddArc(x1 - radius, y1 - radius, radius, radius, 0, 90);
            gp.AddArc(x, y1 - radius, radius, radius, 90, 90);
            gp.AddArc(x, y, radius, radius, 180, 90);
            gp.CloseFigure();
            return gp;
        }
        #endregion

        #region Public Methods
        /// <inheritdoc/>
        public override void Assign(Base source)
        {
            base.Assign(source);

            ShapeObject src = source as ShapeObject;
            Shape = src.Shape;
            Curve = src.Curve;
            DashPattern.Assign(src.DashPattern);
        }

        /// <inheritdoc/>
        public override void Draw(FRPaintEventArgs e)
        {
            if (Math.Abs(Width) < 1 || Math.Abs(Height) < 1)
                return;

            IGraphics g = e.Graphics;
            float x = (AbsLeft + Border.Width / 2) * e.ScaleX;
            float y = (AbsTop + Border.Width / 2) * e.ScaleY;
            float dx = (Width - Border.Width) * e.ScaleX - 1;
            float dy = (Height - Border.Width) * e.ScaleY - 1;
            float x1 = x + dx;
            float y1 = y + dy;

            Pen pen = e.Cache.GetPen(Border.Color, Border.Width * e.ScaleX, Border.DashStyle);

            DrawUtils.SetPenDashPatternOrStyle(DashPattern, pen, Border);

            Brush brush = null;
            if (Fill is SolidFill)
                brush = e.Cache.GetBrush((Fill as SolidFill).Color);
            else
                brush = Fill.CreateBrush(new RectangleF(x, y, dx, dy), e.ScaleX, e.ScaleY);

            Report report = Report;
            if (report != null && report.SmoothGraphics && Shape != ShapeKind.Rectangle)
            {
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = SmoothingMode.AntiAlias;
            }

            switch (Shape)
            {
                case ShapeKind.Rectangle:
                    g.FillAndDrawRectangle(pen, brush, x, y, dx, dy);
                    break;

                case ShapeKind.RoundRectangle:
                    float min = Math.Min(dx, dy);
                    if (curve == 0)
                        min = min / 4;
                    else
                        min = Math.Min(min, curve * e.ScaleX * 10);
                    GraphicsPath gp = GetRoundRectPath(x, y, x1, y1, min);
                    g.FillAndDrawPath(pen, brush, gp);
                    gp.Dispose();
                    break;

                case ShapeKind.Ellipse:
                    g.FillAndDrawEllipse(pen, brush, x, y, dx, dy);
                    break;

                case ShapeKind.Triangle:
                    PointF[] triPoints = {
            new PointF(x1, y1), new PointF(x, y1), new PointF(x + dx / 2, y), new PointF(x1, y1) };
                    g.FillAndDrawPolygon(pen, brush, triPoints);
                    break;

                case ShapeKind.Diamond:
                    PointF[] diaPoints = {
            new PointF(x + dx / 2, y), new PointF(x1, y + dy / 2), new PointF(x + dx / 2, y1),
            new PointF(x, y + dy / 2) };
                    g.FillAndDrawPolygon(pen, brush, diaPoints);
                    break;
            }

            if (!(Fill is SolidFill))
                brush.Dispose();
            if (report != null && report.SmoothGraphics)
            {
                g.InterpolationMode = InterpolationMode.Default;
                g.SmoothingMode = SmoothingMode.Default;
            }
        }

        /// <inheritdoc/>
        public override void Serialize(FRWriter writer)
        {
            Border.SimpleBorder = true;
            base.Serialize(writer);
            ShapeObject c = writer.DiffObject as ShapeObject;

            if (Shape != c.Shape)
                writer.WriteValue("Shape", Shape);
            if (Curve != c.Curve)
                writer.WriteFloat("Curve", Curve);
            if (DashPattern?.Count > 0)
                writer.WriteValue("DashPattern", DashPattern);
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <see cref="ShapeObject"/> class with default settings.
        /// </summary>
        public ShapeObject()
        {
            shape = ShapeKind.Rectangle;
            FlagSimpleBorder = true;
            dashPattern = new FloatCollection();
        }
    }
}