From de850676e79da39aec6f1ce0400cfa94cecbd744 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Sun, 19 Sep 2021 16:32:15 -0400
Subject: First commit

---
 themes/TreeShape.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 themes/TreeShape.h

(limited to 'themes/TreeShape.h')

diff --git a/themes/TreeShape.h b/themes/TreeShape.h
new file mode 100644
index 0000000..fbbb950
--- /dev/null
+++ b/themes/TreeShape.h
@@ -0,0 +1,86 @@
+#include "Renderer2d.h"
+#include "types.h"
+#include "mathlib.h"
+
+struct TreeBranch {
+	float32 width = 0.f;
+	float32 height = 0.f;
+	Vector2 position; // Center point
+	float32 rotation = 0; // How much we are rotated off of the center point in radians
+	Vector4 color = Vector4 { 1.f, 0.f, 0.f, 1.f };
+
+	void fillVertices(Renderer2dVertex* vertices) {
+		Vector2 bottomLeft = Vector2 { position.x - width / 2.f, position.y };
+		Vector2 bottomRight = Vector2 { position.x + width / 2.f, position.y };
+		Vector2 topLeft = (Vector2 { position.x - width / 2.f, position.y + height }).rotate(rotation);
+		Vector2 topRight = (Vector2 { position.x + width / 2.f, position.y + height }).rotate(rotation);
+
+		vertices[0] = { bottomLeft, color };
+		vertices[1] = { bottomRight, color };
+		vertices[2] = { topLeft, color };
+		vertices[3] = { topLeft, color };
+		vertices[4] = { topRight, color };
+	    vertices[5] = { bottomRight, color };
+	}
+};
+
+struct TreeShape {
+	Renderer2dShape shape;
+
+	float32 height             = 100.f; // Height of the whole tree
+	float32 width              = 50.f;  // Width of the whole tree
+    int32 divisionsPerBranch   = 2;     // How many branches to split into at each branch split
+    int32 numBranchLevels      = 8;     // How many branch levels to display
+	float32 animateTimeSeconds = 2.f;   // How long it takes the tree to form
+
+	void load(Renderer2d* renderer) {
+		int32 numBranches = divisionsPerBranch * numBranchLevels;
+		TreeBranch* branches = new TreeBranch[numBranches];
+		int32 numVertices = 6 * numBranches;
+		Renderer2dVertex* vertices = new Renderer2dVertex[numVertices];
+		int32 branchIndex = 0;
+
+		createBranch(branches, numBranches, &branchIndex, 0, width, height, Vector2 { 0.f, 0.f }, 0, vertices);
+
+		shape.load(vertices, numVertices, renderer);
+
+		delete[] branches;
+		delete[] vertices;
+	}
+
+	void createBranch(TreeBranch* branchList, int32 numBranches, int32* branchIndex, int32 branchLevel, float32 width, float32 height, Vector2 position, float32 rotation, Renderer2dVertex* vertices) {
+		TreeBranch* branch = &branchList[*branchIndex];
+		branch->width = width;
+		branch->height = height;
+		branch->position = position;
+		branch->rotation = rotation;
+		branch->fillVertices(&vertices[(*branchIndex) * 6]);
+
+		if (branchLevel == numBranchLevels) {
+			return;
+		}
+
+		float32 branchWidth = width / divisionsPerBranch;
+		float32 branchHeight = height / divisionsPerBranch;
+		for (int division = 0; division < divisionsPerBranch; division++) {
+			float32 branchXPosition = position.x + (((divisionsPerBranch - division) / (divisionsPerBranch - 1)) * width) - width / 2.0;
+			Vector2 branchPosition = (Vector2 { branchXPosition, position.y + height }).rotate(rotation);
+			float32 branchRotation = 0;
+			(*branchIndex)++;
+			createBranch(branchList, numBranches, branchIndex, branchLevel + 1, branchWidth, branchHeight, branchPosition, branchRotation, vertices);
+		}
+	}
+
+	void update(float32 dtSeconds) {
+
+	}
+	
+	void render(Renderer2d* renderer) {
+		shape.render(renderer);
+	}
+	
+	void unload() {
+		shape.unload();
+	}
+};
+
-- 
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