trease-tree-compiler/src/entities/weathered.ts at main · Trease-Focus/trease-tree-compiler

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import { createCanvas, CanvasRenderingContext2D } from 'canvas';

import { spawn, type ChildProcessWithoutNullStreams } from 'child_process';

import { createHash, randomBytes } from 'crypto';

import * as fs from 'fs';

import { SeededRandom } from '../core/seeded-random';

import type { Color } from '../types/color';

import { DEFAULT_CONFIG, type Config } from '../types/config';

import type { Generate } from '../models/generate';

import type { GeneratorResult } from '../types/generator-result';

import type { Context } from 'baojs';

import { get } from 'http';

import { getFFmpegArgs } from '../core/ffmpeg-args';

export class Weathered implements Generate {

getInfo(config?: Config): Promise<GeneratorResult> {

if (!config) {

throw new Error('Config is required to get tree info.');

}

const rand = new SeededRandom(config.seed);

const startPos = new Vector2(0, 0);

const initialLength = 200;

const maxDepth = 7;

const fullTree = generateFullTree(rand, startPos, initialLength, -90, maxDepth, 0);

const bounds = calculateBounds(fullTree);

const scale = Math.min(

(config.width - config.padding * 2) / (bounds.maxX - bounds.minX),

(config.height - config.padding * 2) / (bounds.maxY - bounds.minY)

);

const treeCenterX = bounds.minX + (bounds.maxX - bounds.minX) / 2;

const targetCenterX = config.width / 2;

const offsetX = targetCenterX - treeCenterX * scale;

const offsetY = (config.height - config.padding) - bounds.maxY * scale;

return Promise.resolve({

trunkStartPosition: { x: offsetX, y: offsetY }

});

}

async generate(con: Context, onStream?:(process:ChildProcessWithoutNullStreams,videoStream:ChildProcessWithoutNullStreams['stdout']) => void, CONFIG: Config = DEFAULT_CONFIG): Promise<GeneratorResult> {

console.log("Generating Tree");

const canvas = createCanvas(CONFIG.width, CONFIG.height);

const ctx = canvas.getContext('2d');

const rand = new SeededRandom(CONFIG.seed);

// Generate logical tree roughly centered at 0,0 first, then shift

// We use a dummy start position, we will move it later

const startPos = new Vector2(0, 0);

const initialLength = 200; // Arbitrary unit, will be scaled

const maxDepth = 7;

const fullTree = generateFullTree(

rand,

startPos,

initialLength,

-90,

maxDepth,

);

const bounds = calculateBounds(fullTree);

const treeWidth = bounds.maxX - bounds.minX;

const treeHeight = bounds.maxY - bounds.minY;

// Available space

const availW = CONFIG.width - (CONFIG.padding * 2);

const availH = CONFIG.height - (CONFIG.padding * 2);

// Scale to fit (maintain aspect ratio)

const scaleX = availW / treeWidth;

const scaleY = availH / treeHeight;

const finalScale = Math.min(scaleX, scaleY);

// Calculate offsets to center the tree

// We want the bounding box center to align with canvas center

// However, for a tree, it usually looks best if the "root" is at the bottom-center

// But since we want it "perfectly in frame", let's center the bounding box vertically too,

// or align bottom. Let's align bottom of tree to bottom margin.

const treeCenterX = bounds.minX + (treeWidth / 2);

const targetCenterX = CONFIG.width / 2;

const offsetX = targetCenterX - (treeCenterX * finalScale);

// Align bottom: bounds.maxY should be at CONFIG.height - padding

// Note: Canvas Y goes down. -90 deg means Y decreases.

// bounds.maxY is likely the root (0), bounds.minY is the top leaves.

const offsetY = (CONFIG.height - CONFIG.padding) - (bounds.maxY * finalScale);

console.log(` Tree Width: ${treeWidth.toFixed(0)}, Height: ${treeHeight.toFixed(0)}`);

console.log(` Scale: ${finalScale.toFixed(3)}`);

console.log(` Offset: ${offsetX.toFixed(0)}, ${offsetY.toFixed(0)}`);

const maxDistance = getMaxDist(fullTree);

console.log(` Max Growth Distance: ${maxDistance.toFixed(0)}`);

if (CONFIG.photoOnly) {

console.log("📸 Generating final tree image only (video creation skipped).");

// Set growth to maximum to draw the final state

const currentGrowthDist = maxDistance + 700;

ctx.clearRect(0, 0, CONFIG.width, CONFIG.height);

const branches: SimpleBranch[] = [];

let entities: Entity[] = [];

flattenTreeOrganic(fullTree, branches, entities, currentGrowthDist, finalScale, offsetX, offsetY);

ctx.lineCap = 'round';

ctx.lineJoin = 'round';

ctx.strokeStyle = '#3E2723';

for (const b of branches) {

ctx.beginPath();

ctx.lineWidth = b.strokeWidth;

ctx.moveTo(b.start.x, b.start.y);

ctx.quadraticCurveTo(b.control.x, b.control.y, b.end.x, b.end.y);

ctx.stroke();

}

ctx.strokeStyle = '#6D4C41';

for (const b of branches) {

if (b.strokeWidth < 1) continue;

ctx.beginPath();

ctx.lineWidth = b.strokeWidth * 0.5;

const off = -1;

ctx.moveTo(b.start.x + off, b.start.y + off);

ctx.quadraticCurveTo(b.control.x + off, b.control.y + off, b.end.x + off, b.end.y + off);

ctx.stroke();

}

for (const e of entities) {

const prevAlpha = ctx.globalAlpha;

ctx.globalAlpha = (e.opacity ?? 1);

ctx.fillStyle = 'rgba(0,0,0,0.1)';

ctx.beginPath();

ctx.arc(e.center.x + 2, e.center.y + 5, e.radius, 0, Math.PI * 2);

ctx.fill();

const g = ctx.createRadialGradient(e.center.x - e.radius * 0.3, e.center.y - e.radius * 0.3, e.radius * 0.1, e.center.x, e.center.y, e.radius);

g.addColorStop(0, `rgba(${e.highlightColor.r},${e.highlightColor.g},${e.highlightColor.b},1)`);

g.addColorStop(1, `rgba(${e.baseColor.r},${e.baseColor.g},${e.baseColor.b},1)`);

ctx.beginPath();

ctx.fillStyle = g;

ctx.arc(e.center.x, e.center.y, e.radius, 0, Math.PI * 2);

ctx.fill();

ctx.globalAlpha = prevAlpha;

}

const finalBuffer = canvas.toBuffer('image/png');

if (CONFIG.save_as_file) {

fs.writeFileSync(CONFIG.imageFilename, finalBuffer);

}

console.log(`\n✅ Image generation complete!`);

console.log(` Image saved: ${CONFIG.imageFilename}`);

return {

imageBuffer: finalBuffer,

imagePath: CONFIG.save_as_file ? CONFIG.imageFilename : undefined,

trunkStartPosition: { x: offsetX, y: offsetY }

}; // Exit after saving the image

}

return {};

}

class Vector2 {

constructor(public x: number, public y: number) { }

static zero = () => new Vector2(0, 0);

}

interface Entity {

center: Vector2;

radius: number;

baseColor: Color;

highlightColor: Color;

distFromRoot: number; // Distance from root for timing

opacity?: number; // 0..1 fade-in multiplier

attachmentPoint?: Vector2;

}

class Branch {

constructor(

public start: Vector2,

public end: Vector2,

public strokeWidth: number,

public control: Vector2,

public length: number, // Actual length

public distFromRoot: number, // Cumulative distance

public children: Branch[] = [],

public entities: Entity[] = []

) { }

}

class SimpleBranch {

constructor(

public start: Vector2,

public end: Vector2,

public strokeWidth: number,

public control: Vector2

) { }

}

interface Bounds {

minX: number; maxX: number; minY: number; maxY: number;

}

const coerceIn = (val: number, min: number, max: number) => Math.max(min, Math.min(val, max));

function smoothStep(t: number): number {

return t * t * (3 - 2 * t);

}

function generateFullTree(

rand: SeededRandom,

start: Vector2,

length: number,

angle: number,

depth: number,

currentDist: number,

): Branch {

const angleOffset = rand.nextFloat(-20, 20); // More twisty

const radAngle = (angle + angleOffset) * (Math.PI / 180);

const endX = start.x + length * Math.cos(radAngle);

const endY = start.y + length * Math.sin(radAngle);

const end = new Vector2(endX, endY);

const dx = end.x - start.x;

const dy = end.y - start.y;

const mid = new Vector2(start.x + dx * 0.5, start.y + dy * 0.5);

const perpLen = rand.nextFloat(-0.2, 0.2) * length;

const branchLength = Math.sqrt(dx * dx + dy * dy);

let perpX = 0, perpY = 0;

if (branchLength !== 0) {

perpX = (-dy / branchLength) * perpLen;

perpY = (dx / branchLength) * perpLen;

}

const control = new Vector2(mid.x + perpX, mid.y + perpY);

const strokeWidth = Math.max(2, (depth * 4 + rand.nextFloat(-1, 1)));

const children: Branch[] = [];

if (depth > 0) {

const branchCount = rand.nextInt(2, 3); // 2 to 3 branches

for (let i = 0; i < branchCount; i++) {

const angleVariation = rand.nextFloat(-45, 45);

const newAngle = angle + angleVariation;

const newLength = length * rand.nextFloat(0.7, 0.9);

children.push(generateFullTree(

rand,

end,

newLength,

newAngle,

depth - 1,

currentDist + length,

));

}

return new Branch(start, end, strokeWidth, control, length, currentDist, children);

}

// Recurse tree to find min/max coords

function calculateBounds(b: Branch, currentBounds: Bounds = { minX: Infinity, maxX: -Infinity, minY: Infinity, maxY: -Infinity }): Bounds {

// Check branch points

currentBounds.minX = Math.min(currentBounds.minX, b.start.x, b.end.x, b.control.x);

currentBounds.maxX = Math.max(currentBounds.maxX, b.start.x, b.end.x, b.control.x);

currentBounds.minY = Math.min(currentBounds.minY, b.start.y, b.end.y, b.control.y);

currentBounds.maxY = Math.max(currentBounds.maxY, b.start.y, b.end.y, b.control.y);

// Check entities (leaves expand bounds)

b.entities.forEach(e => {

currentBounds.minX = Math.min(currentBounds.minX, e.center.x - e.radius);

currentBounds.maxX = Math.max(currentBounds.maxX, e.center.x + e.radius);

currentBounds.minY = Math.min(currentBounds.minY, e.center.y - e.radius);

currentBounds.maxY = Math.max(currentBounds.maxY, e.center.y + e.radius);

});

b.children.forEach(child => calculateBounds(child, currentBounds));

return currentBounds;

}

// Find the maximum path length in the tree for animation timing

function getMaxDist(b: Branch): number {

let max = b.distFromRoot + b.length;

for (const child of b.children) {

max = Math.max(max, getMaxDist(child));

}

return max;

}

function flattenTreeOrganic(

b: Branch,

branchList: SimpleBranch[],

entityList: Entity[],

progressDistance: number, // The 'water level' of growth

scale: number,

offsetX: number,

offsetY: number

) {

const tStart = new Vector2(b.start.x * scale + offsetX, b.start.y * scale + offsetY);

const tEnd = new Vector2(b.end.x * scale + offsetX, b.end.y * scale + offsetY);

const tControl = new Vector2(b.control.x * scale + offsetX, b.control.y * scale + offsetY);

// This branch starts growing when the "progress wave" hits its start distance

// It finishes growing when the wave hits its end distance

const startDist = b.distFromRoot;

const endDist = b.distFromRoot + b.length;

if (progressDistance > startDist) {

// Calculate how much of this specific branch is grown

let localT = (progressDistance - startDist) / b.length;

localT = coerceIn(localT, 0, 1);

if (localT > 0) {

// Bezier Interpolation for "growing" tip

const omt = 1 - localT;

const curControlX = omt * tStart.x + localT * tControl.x;

const curControlY = omt * tStart.y + localT * tControl.y;

const q1X = omt * tControl.x + localT * tEnd.x;

const q1Y = omt * tControl.y + localT * tEnd.y;

const curEndX = omt * curControlX + localT * q1X;

const curEndY = omt * curControlY + localT * q1Y;

// Stroke thickens as it ages (start thickness vs tip thickness)

const visibleStroke = b.strokeWidth * scale * localT;

branchList.push(new SimpleBranch(

tStart,

new Vector2(curEndX, curEndY),

visibleStroke,

new Vector2(curControlX, curControlY)

));

// They start growing when the growth wave passes their specific attachment point

b.entities.forEach(entity => {

if (progressDistance > entity.distFromRoot) {

// How far past the entity are we?

const age = progressDistance - entity.distFromRoot;

// Grow in over 150 units of distance

const growSpeed = 150;

let growthP = age / growSpeed;

growthP = coerceIn(growthP, 0, 1);

// Smooth growth using easing

const radiusScale = smoothStep(growthP);

if (radiusScale > 0.01) {

const finalCenterX = entity.center.x * scale + offsetX;

const finalCenterY = entity.center.y * scale + offsetY;

entityList.push({

...entity,

center: new Vector2(finalCenterX, finalCenterY),

// radius grows smoothly from near-zero to full size

radius: entity.radius * scale * radiusScale,

// Full opacity during growth (no fading)

opacity: 1.0

});

}

});

}

// Recurse

b.children.forEach(child => {

flattenTreeOrganic(child, branchList, entityList, progressDistance, scale, offsetX, offsetY);

});

}

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