source: 2014/30/MikkoI/WindowsGame1/WindowsGame1/WindowsGame1/Render/MapRenderer.cs @ 5626

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

namespace WindowsGame1
{
    class MapRenderer
    {
        //renderöi periaatteessa kaiken paitsi GUI:n. sisältää tekstuurit
        Map map;
        Vector3 baseSunPosition = new Vector3(0, 0, 0);
        Camera camera;
        RendererBase r;

        float sunAngle = 24;
        Vector3 sunPosition = Vector3.Zero;

        public MapRenderer(RendererBase r, Map map, Camera camera)
        {
            this.map = map;
            this.baseSunPosition = new Vector3(map.Size.X / 2, map.Size.Y / 2, 40);//alusta auringon pyörityksen joint-piste
            this.camera = camera;
            this.r = r;
        }

        void renderGroundObjects(Matrix matrix) {
            //renderöi kaikki maassa olevat dynaamiset objektit, eli puut, olennot ym.
            r.spriteBatch.Begin(SpriteSortMode.FrontToBack, null, null, null, null, null, matrix);

            //VARJOJEN RENDERÖINTI
            foreach (MapObject obj in map.Objects)
            {
                Texture2D texture = Pikseli.Instance.textures[obj.textureId];
                Vector2 size = new Vector2(texture.Width, texture.Height) * camera.zoomFactor;//ditto

                Vector2 erotus = new Vector2(sunPosition.X, sunPosition.Y) - obj.position;


                float shadowAngle = (float)(Math.Atan2(erotus.Y, erotus.X) - Math.PI / 2.0);

                var shadowDirection = sunPosition - new Vector3(obj.position.X, obj.position.Y, 0f);
                shadowDirection.Normalize();

                double dot = Vector3.Dot(Vector3.UnitZ, shadowDirection);

                r.spriteBatch.Draw(texture, new Rectangle((int)((obj.position.X + 0.5) * 64), (int)((obj.position.Y + 0.5) * 64), texture.Width, (int)((1.0 / dot) * texture.Height - texture.Height)), null, new Color(0f, 0f, 0f, 0.5f), shadowAngle, new Vector2(texture.Width / 2, texture.Height + obj.shadowOffset), SpriteEffects.None, 0.5f);
            }

            r.spriteBatch.End();

            r.spriteBatch.Begin(SpriteSortMode.FrontToBack, BlendState.AlphaBlend);

            //OBJEKTIEN RENDERÖINTI
            foreach (MapObject obj in map.Objects)
            {
                Texture2D texture = Pikseli.Instance.textures[obj.textureId];
                Vector2 size = new Vector2(texture.Width, texture.Height) * camera.zoomFactor;//ditto
                r.renderGroundObject(texture, (int)obj.position.X, (int)obj.position.Y, size, matrix, camera);
            }

            r.spriteBatch.End();
        }

        void renderSky(Matrix matrix) {
            r.spriteBatch.Begin(SpriteSortMode.FrontToBack, BlendState.AlphaBlend);

            Texture2D starBackground = Pikseli.Instance.textures["taivas/tähdet"];

            r.renderBackground(starBackground, new Vector2(starBackground.Width, starBackground.Height));

            r.spriteBatch.End();
        }

        public void Render(Matrix matrix)
        {//renderöi koko mapin, kutsu ulkopuolelta
            renderSky(matrix);

            r.spriteBatch.Begin(SpriteSortMode.Deferred, null, null, null, null, null, matrix);
            for (var x = 0; x < map.Size.X; x++)
            {
                for (var y = 0; y < map.Size.Y; y++)
                {
                    r.renderGroundTile(Pikseli.Instance.textures[map.Tiles[x, y].textureId], x, y);
                }
            }
            r.spriteBatch.End();

            renderGroundObjects(matrix);

            r.spriteBatch.Begin();

            sunAngle += 1 / 3000.0f;//auringon pyörimisnopeus

            sunPosition = baseSunPosition + new Vector3((float)Math.Sin(sunAngle), (float)Math.Cos(sunAngle), 0) * 100;

            Vector3 fixedSun = sunPosition;
            fixedSun.Z *= -1.0f;
            fixedSun.Z += 22;//alaspäin että näkyy pelissä

            Texture2D sunTexture = Pikseli.Instance.textures["taivas/aurinko"];

            r.renderDistantSprite(sunTexture, fixedSun, new Vector2(sunTexture.Width * camera.zoomFactor * 5, sunTexture.Height * camera.zoomFactor * 5), matrix);
            r.spriteBatch.End();
        }
    }
}