2020-07-15 19:01:28 +00:00
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using System;
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2020-07-16 15:34:10 +00:00
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using System.Collections.Generic;
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2020-07-15 19:01:28 +00:00
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namespace SemiColinGames {
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public sealed class TreeScene : IScene {
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2020-07-16 15:34:10 +00:00
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const int MAX_SEGMENTS = 1000;
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const int MAX_VERTICES = MAX_SEGMENTS * 6; // 2 triangles per segment
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2020-07-15 19:56:56 +00:00
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private readonly Color backgroundColor = Color.SkyBlue;
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private readonly GraphicsDevice graphics;
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private readonly BasicEffect basicEffect;
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private VertexPositionColor[] vertices;
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private VertexBuffer vertexBuffer;
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public TreeScene(GraphicsDevice graphics) {
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this.graphics = graphics;
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basicEffect = new BasicEffect(graphics) {
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World = Matrix.CreateTranslation(0, 0, 0),
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View = Matrix.CreateLookAt(Vector3.Backward, Vector3.Zero, Vector3.Up),
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VertexColorEnabled = true,
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Projection = Matrix.CreateOrthographicOffCenter(-1920 / 2, 1920 / 2, -1080 / 4, 1080 * 3 / 4, -1, 1)
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};
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2020-07-16 15:34:10 +00:00
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vertices = new VertexPositionColor[MAX_VERTICES];
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vertexBuffer = new VertexBuffer(
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graphics, typeof(VertexPositionColor), MAX_VERTICES, BufferUsage.WriteOnly);
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}
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2020-07-15 19:17:19 +00:00
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~TreeScene() {
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Dispose();
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}
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public void Dispose() {
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vertexBuffer.Dispose();
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GC.SuppressFinalize(this);
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}
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2020-07-16 15:34:10 +00:00
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public struct Trapezoid {
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public Vector2 p1, p2, p3, p4;
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}
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2020-07-16 19:18:30 +00:00
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public class TreeNode {
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public float Orientation; // relative to parent
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public float Length;
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public float InWidth;
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public float OutWidth;
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public readonly List<TreeNode> Children;
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public Vector2 Position;
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public TreeNode(float orientation, float length, float inWidth, float outWidth) :
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this(orientation, length, inWidth, outWidth, new List<TreeNode>()) {
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}
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public TreeNode(float orientation, float length, float inWidth, float outWidth, TreeNode child) :
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this(orientation, length, inWidth, outWidth, new List<TreeNode>() { child }) {
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}
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public TreeNode(float orientation, float length, float inWidth, float outWidth, TreeNode child1, TreeNode child2) :
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this(orientation, length, inWidth, outWidth, new List<TreeNode>() { child1, child2 }) {
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}
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public TreeNode(float orientation, float length, float inWidth, float outWidth, TreeNode child1, TreeNode child2, TreeNode child3) :
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this(orientation, length, inWidth, outWidth, new List<TreeNode>() { child1, child2, child3 }) {
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}
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public TreeNode(float orientation, float length, float inWidth, float outWidth, List<TreeNode> children) {
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Orientation = orientation;
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Length = length;
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InWidth = inWidth;
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OutWidth = outWidth;
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Children = children;
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Position = Vector2.Zero;
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}
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}
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public void Draw(bool isRunningSlowly, IWorld iworld, bool paused) {
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var tree =
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new TreeNode(-0.2f, 100, 10, 6,
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new TreeNode(-0.2f, 100, 10, 6,
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new TreeNode(-0.2f, 100, 10, 6,
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new TreeNode(-0.3f, 100, 6, 4,
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new TreeNode(-0.1f, 100, 6, 4,
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new TreeNode(-0.3f, 150, 4, 2),
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new TreeNode(0.2f, 200, 4, 2),
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new TreeNode(0.5f, 100, 4, 2))),
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new TreeNode(0.5f, 100, 6, 4,
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new TreeNode(-0.1f, 100, 6, 4,
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new TreeNode(-0.1f, 150, 4, 2),
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new TreeNode(0.2f, 200, 4, 2))))));
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2020-07-15 19:01:28 +00:00
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graphics.Clear(backgroundColor);
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var segments = new List<Trapezoid>();
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LinkedList<TreeNode> queue = new LinkedList<TreeNode>();
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queue.AddLast(tree);
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while (queue.Count > 0) {
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TreeNode parent = queue.First.Value;
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queue.RemoveFirst();
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Vector2 outVector = new Vector2(0, parent.Length).Rotate(parent.Orientation);
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Vector2 outPosition = Vector2.Add(parent.Position, outVector);
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Trapezoid t = new Trapezoid();
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t.p1 = new Vector2(parent.Position.X - parent.InWidth, parent.Position.Y);
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t.p2 = new Vector2(parent.Position.X + parent.InWidth, parent.Position.Y);
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t.p3 = new Vector2(outPosition.X - parent.OutWidth, outPosition.Y);
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t.p4 = new Vector2(outPosition.X + parent.OutWidth, outPosition.Y);
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segments.Add(t);
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foreach (TreeNode child in parent.Children) {
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child.Position = outPosition;
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child.Orientation += parent.Orientation;
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queue.AddLast(child);
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}
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}
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Color color = Color.SaddleBrown;
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for (int i = 0; i < segments.Count; i++) {
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Trapezoid t = segments[i];
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vertices[i * 6] = new VertexPositionColor(new Vector3(t.p1.X, t.p1.Y, 0), color);
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vertices[i * 6 + 1] = new VertexPositionColor(new Vector3(t.p2.X, t.p2.Y, 0), color);
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vertices[i * 6 + 2] = new VertexPositionColor(new Vector3(t.p3.X, t.p3.Y, 0), color);
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vertices[i * 6 + 3] = new VertexPositionColor(new Vector3(t.p2.X, t.p2.Y, 0), color);
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vertices[i * 6 + 4] = new VertexPositionColor(new Vector3(t.p3.X, t.p3.Y, 0), color);
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vertices[i * 6 + 5] = new VertexPositionColor(new Vector3(t.p4.X, t.p4.Y, 0), color);
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}
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graphics.SetVertexBuffer(vertexBuffer);
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vertexBuffer.SetData(vertices);
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2020-07-15 19:56:56 +00:00
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foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes) {
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pass.Apply();
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graphics.DrawPrimitives(PrimitiveType.TriangleList, 0, segments.Count * 2);
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}
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}
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}
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}
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