ProgressBar.cs

Siirry tämän tiedoston dokumentaatioon.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;

namespace Jypeli.Widgets
{
    public class ProgressBar : BindableWidget
    {
        private double h = -1;
        private double w = -1;

        private static readonly Vector[] barVertices = new Vector[]
        {
            new Vector(-0.5, 0),
            new Vector(0.5, 0),
            new Vector(0.5, 1.0),
            new Vector(-0.5, 1.0)
        };

        private static readonly IndexTriangle[] barIndices = new IndexTriangle[]
        {
            new IndexTriangle(0, 3, 2),
            new IndexTriangle(0, 2, 1)
        };

        private static readonly Vector[] borderVertices = new Vector[]
        {
            new Vector(-0.5, 0.5),
            new Vector(-0.5, -0.5),
            new Vector(0.5, -0.5),
            new Vector(0.5, 0.5),
        };

        private static readonly ShapeCache shapeCache = new ShapeCache( barVertices, barIndices );

        public Image BarImage { get; set; }

        public Color BarColor { get; set; }

        public ProgressBar( double width, double height )
            : base( width, height )
        {
            Color = Color.Transparent;
            BarColor = Color.Red;
            BarImage = null;
        }

        public ProgressBar(double width, double height, Meter meter)
            : this(width, height)
        {
            BindTo(meter);
        }

        Matrix imgFull;
        Matrix imgPart;
        Matrix colorPart;

        protected override void UpdateValue()
        {
            double barLength = Size.X * Meter.RelativeValue;

            imgPart =
                    Matrix.CreateScale( (float)barLength, (float)Size.Y, 1f )
                    * Matrix.CreateTranslation( (float)( barLength / 2 ), 0, 0 )
                    * Matrix.CreateTranslation( (float)( -Width / 2 ), 0, 0 )
                    * Matrix.CreateRotationZ( (float)( Angle ).Radians )
                    * Matrix.CreateTranslation( (float)Position.X, (float)Position.Y, 0.0f );

            imgFull =
                Matrix.CreateScale( (float)Size.X, (float)Size.Y, 1f )
                * Matrix.CreateRotationZ( (float)( Angle ).Radians )
                * Matrix.CreateTranslation( (float)Position.X, (float)Position.Y, 0.0f );

            colorPart =
                Matrix.CreateScale( (float)barLength, (float)Size.Y, 1f )
                * Matrix.CreateTranslation( (float)( barLength / 2 ), 0, 0 )
                * Matrix.CreateTranslation( (float)( -Width / 2 ), (float)( -Height / 2 ), 0 )
                * Matrix.CreateRotationZ( (float)( Angle ).Radians )
                * Matrix.CreateTranslation( (float)Position.X, (float)Position.Y, 0.0f );
        }

        protected override void Draw( Matrix parentTransformation, Matrix transformation )
        {
            // TODO: Optimization?
            UpdateValue();

            if ( BarImage != null )
            {
                Matrix imp = imgPart * parentTransformation;
                Matrix imf = imgFull * parentTransformation;

                Renderer.BeginDrawingInsideShape( Shape.Rectangle, ref imp );
                Renderer.DrawImage( BarImage, ref imf, TextureWrapSize );
                Renderer.EndDrawingInsideShape();
            }
            else
            {
                Matrix m = colorPart * parentTransformation;
                Renderer.DrawFilledShape( shapeCache, ref m, BarColor );
            }

            // The border that is drawn by base class gets obscured by the bar.
            // Let's draw it again.
            Renderer.DrawPolygon( borderVertices, ref transformation, BorderColor );

            base.Draw( parentTransformation, transformation );
        }
    }
}