198 lines
10 KiB
C#
198 lines
10 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using Microsoft.Xna.Framework.Input;
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using MonoGame.Extended;
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using System;
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using System.Collections.Generic;
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using System.Threading;
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namespace Orpticon.MonoGameLighting
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{
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public static class Lighting
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{
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private static Texture2D pixelTexture;
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public static float MaxOpacity { get; set; } = 0.5f; // Maximum opacity
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public static float BaseDarkness { get; set; } = 0.95f;
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private static Rectangle CameraRect;
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private static float[] alphaMap;
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public static void Initialize(GraphicsDeviceManager graphicsDevice, Rectangle cameraRect)
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{
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// TODO: Add your initialization logic here
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pixelTexture = new Texture2D(graphicsDevice.GraphicsDevice, 1, 1);
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pixelTexture.SetData(new Color[] { Color.White });
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CameraRect = cameraRect;
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alphaMap = new float[CameraRect.Width * CameraRect.Height];
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Array.Fill(alphaMap, 1f);
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}
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, float radius) => RenderCone(_spriteBatch, originPoint, new Vector2(0, -1), radius, 360, new List<RectangleF>(), Color.White);
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, float radius, Color color) => RenderCone(_spriteBatch, originPoint, new Vector2(0, -1), radius, 360, new List<RectangleF>(), color);
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, float radius, List<RectangleF> collisionBoxes) => RenderCone(_spriteBatch, originPoint, new Vector2(0, -1), radius, 360, collisionBoxes, Color.White);
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, float radius, List<RectangleF> collisionBoxes, Color color) => RenderCone(_spriteBatch, originPoint, new Vector2(0, -1), radius, 360, collisionBoxes, color);
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, Vector2 direction, float coneRadius, float coneAngleInDegrees) => RenderCone(_spriteBatch, originPoint, direction, coneRadius, coneAngleInDegrees, new List<RectangleF>(), Color.White);
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, Vector2 direction, float coneRadius, float coneAngleInDegrees, List<RectangleF> collisionBoxes) => RenderCone(_spriteBatch, originPoint, direction, coneRadius, coneAngleInDegrees, collisionBoxes, Color.White);
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public static void RenderCone(SpriteBatch _spriteBatch, Vector2 originPoint, Vector2 notNormalizedDirection, float coneRadius, float coneAngleInDegrees, List<RectangleF> collisionBoxes, Color color)
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{
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float halfAngle = MathHelper.ToRadians(coneAngleInDegrees) / 2;
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Vector2 normalizedDirection = Vector2.Normalize(notNormalizedDirection);
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float coneStartAngle = (float)Math.Atan2(normalizedDirection.Y, normalizedDirection.X) - halfAngle;
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float coneEndAngle = (float)Math.Atan2(normalizedDirection.Y, normalizedDirection.X) + halfAngle;
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Vector2 startingPoint = new Vector2(
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Math.Min(originPoint.X, originPoint.X + normalizedDirection.X * coneRadius) - coneRadius,
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Math.Min(originPoint.Y, originPoint.Y + normalizedDirection.Y * coneRadius) - coneRadius
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);
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float radiusSquared = coneRadius * coneRadius;
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float maxBoundingCircleRadius = (float)Math.Sqrt(2 * (1f / 2) * (1f / 2)); // Diagonal of a block
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List<RectangleF> filteredCollisionBoxes = new List<RectangleF>();
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foreach (var collisionBox in collisionBoxes)
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{
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Vector2 boxCenter = new Vector2(collisionBox.Center.X, collisionBox.Center.Y);
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Vector2 directionToBox = Vector2.Normalize(boxCenter - originPoint);
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float distanceToBoxCenter = Vector2.Distance(originPoint, boxCenter);
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if (distanceToBoxCenter > coneRadius + maxBoundingCircleRadius)
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continue;
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float angleToBox = (float)Math.Atan2(directionToBox.Y, directionToBox.X);
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if (angleToBox < 0)
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angleToBox += MathHelper.TwoPi;
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float normalizedConeStartAngle = coneStartAngle < 0 ? coneStartAngle + MathHelper.TwoPi : coneStartAngle;
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float normalizedConeEndAngle = coneEndAngle < 0 ? coneEndAngle + MathHelper.TwoPi : coneEndAngle;
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bool withinConeAngle = normalizedConeStartAngle <= angleToBox && angleToBox <= normalizedConeEndAngle;
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if (normalizedConeEndAngle < normalizedConeStartAngle)
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withinConeAngle = angleToBox >= normalizedConeStartAngle || angleToBox <= normalizedConeEndAngle;
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if (withinConeAngle)
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{
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filteredCollisionBoxes.Add(collisionBox);
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}
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}
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for (float y = startingPoint.Y; y < originPoint.Y + coneRadius; y += 1)
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{
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for (float x = startingPoint.X; x < originPoint.X + coneRadius; x += 1)
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{
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if(!CameraRect.Contains(x, y)) continue;
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Vector2 blockCenter = new Vector2(x + 1 / 2, y + 1 / 2);
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Vector2 toBlock = blockCenter - originPoint;
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if (toBlock.LengthSquared() > radiusSquared)
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continue;
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Vector2 directionToBlock = Vector2.Normalize(toBlock);
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float angleToBlock = (float)Math.Atan2(directionToBlock.Y, directionToBlock.X);
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if (angleToBlock < 0)
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angleToBlock += MathHelper.TwoPi;
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float normalizedConeStartAngle = coneStartAngle < 0 ? coneStartAngle + MathHelper.TwoPi : coneStartAngle;
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float normalizedConeEndAngle = coneEndAngle < 0 ? coneEndAngle + MathHelper.TwoPi : coneEndAngle;
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bool withinConeAngle = normalizedConeStartAngle <= angleToBlock && angleToBlock <= normalizedConeEndAngle;
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if (normalizedConeEndAngle < normalizedConeStartAngle)
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withinConeAngle = angleToBlock >= normalizedConeStartAngle || angleToBlock <= normalizedConeEndAngle;
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if (withinConeAngle)
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{
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bool clearLineOfSight = true;
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foreach (var collisionBox in filteredCollisionBoxes)
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{
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if (collisionBox.Contains(blockCenter) || RayIntersectsRectangle(originPoint, blockCenter, collisionBox))
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{
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clearLineOfSight = false;
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break;
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}
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}
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if (clearLineOfSight)
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{
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float distanceToCenter = toBlock.Length();
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float opacity = MaxOpacity * (1 - MathHelper.Clamp(distanceToCenter / coneRadius, 0f, 1f));
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DrawFilledRectangle((int)x, (int)y, opacity);
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}
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}
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}
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}
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}
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private static void DrawFilledRectangle(int x, int y, float opacity)
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{
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int i = (y - CameraRect.Y) * CameraRect.Width + (x - CameraRect.X);
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alphaMap[i] *= (1 - opacity);
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}
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private static bool PointInCone(Vector2 point, Vector2 originPoint, Vector2 endPoint, float coneRadius, float angleOffset)
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{
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Vector2 directionToPoint = point - originPoint;
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Vector2 directionToEndpoint = endPoint - originPoint;
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float dotProduct = Vector2.Dot(directionToPoint, directionToEndpoint);
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if (dotProduct < 0)
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return false; // Point is behind the origin point of the cone
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float distanceSquaredToOrigin = Vector2.DistanceSquared(point, originPoint);
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float maxDistanceSquared = coneRadius * coneRadius;
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if (distanceSquaredToOrigin > maxDistanceSquared)
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return false; // Point is outside cone radius
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float angleToPoint = (float)Math.Acos(dotProduct / (directionToPoint.Length() * directionToEndpoint.Length()));
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return angleToPoint <= angleOffset;
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}
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private static bool RayIntersectsRectangle(Vector2 rayStart, Vector2 rayEnd, RectangleF rectangle)
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{
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Vector2 direction = rayEnd - rayStart;
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float invDirX = 1.0f / direction.X;
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float invDirY = 1.0f / direction.Y;
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float tNearX = (rectangle.Left - rayStart.X) * invDirX;
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float tNearY = (rectangle.Top - rayStart.Y) * invDirY;
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float tFarX = (rectangle.Right - rayStart.X) * invDirX;
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float tFarY = (rectangle.Bottom - rayStart.Y) * invDirY;
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if (tNearX > tFarX) (tNearX, tFarX) = (tFarX, tNearX);
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if (tNearY > tFarY) (tNearY, tFarY) = (tFarY, tNearY);
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if (tNearX > tFarY || tNearY > tFarX)
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return false;
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float tNear = Math.Max(tNearX, tNearY);
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float tFar = Math.Min(tFarX, tFarY);
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return tNear >= 0 && tFar >= 0 && tNear <= 1;
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}
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public static void ApplyAlphaMap(SpriteBatch _spriteBatch)
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{
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for(int x = 0; x < CameraRect.Width; x++)
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{
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for(int y = 0; y < CameraRect.Height; y++)
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{
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int i = y * CameraRect.Width + x;
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_spriteBatch.Draw(pixelTexture, new Rectangle(x + CameraRect.X, y + CameraRect.Y, 1, 1), Color.Black * BaseDarkness * alphaMap[i]);
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}
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}
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}
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//protected override void Draw(GameTime gameTime)
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//{
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// GraphicsDevice.Clear(Color.Green);
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// _spriteBatch.Begin();
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// var pos = Mouse.GetState().Position.ToVector2();
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// var cen = new Vector2(_graphics.PreferredBackBufferWidth / 2, _graphics.PreferredBackBufferHeight / 2);
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// var rects = new List<RectangleF> { new RectangleF(pos, new Vector2(48, 48)), new RectangleF(new Vector2(1024, 384), new Vector2(48, 48)) };
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// rects.ForEach(x => DrawFilledRectangle(_spriteBatch, x, Color.Brown));
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// RenderCone(_spriteBatch, new Vector2(cen.X, cen.Y), 1000, rects);
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// _spriteBatch.End();
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// base.Draw(gameTime);
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//}
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}
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}
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