triangle-trees/index.html at main · EDRipper/triangle-trees · GitHub

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<!doctype html>
<html>
    <head>
        <meta charset="utf-8" />
            <title>Sierpinski Trees</title>
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <script src="https://cdn.jsdelivr.net/npm/p5@1.9.0/lib/p5.min.js"></script>
    </head>
    <body style="margin:0;background:#334886;">
        <div class="card">

        <div class="container">
            <h2><b>Triangular trees</b></h2>
            <p>WOWEEE those trees sure are triangular, and getting pointier by the second. I wonder what the area and surface area is?<br>probably best not to dwell on such questions. Clicking on that path will take us out of here! -Or try find my easter egg!
            </p>
        </div>
    </div>
    <script>
        let pathX;
        let cirCol;
        let numTrees = screen.width/130;
        let hillY;
        let backgroundCol = (51, 72, 134);
        let offsets = [];
        let depth = 0; //track current depth
        let lastUpdate = 0; // timer
        let maxDepth = 4;
        let pathHeight = 0;
        let treeOffsets = []; // for the lower group of trees to look dispersed
        function setup() {
            let canvas=createCanvas(windowWidth, windowHeight);
            noStroke();
            cirCol=color(255, 255, 0,255);
            hillY = height * 0.7;
            for (let i = 0; i < numTrees; i++) {
                treeOffsets.push(Math.random()*40);
            }
    }


    function makeTriangle(a, b, c) {
        beginShape();
        fill(0, 120, 0);
        vertex(a.x, a.y);
        vertex(b.x, b.y);
        vertex(c.x, c.y);
        endShape(CLOSE);
    }

    function sierpinski(a, b, c, level) {
        if (level === 0) {
            makeTriangle(a, b, c);
        } else {
            let ab = p5.Vector.lerp(a, b, 0.5);
            let bc = p5.Vector.lerp(b, c, 0.5);
            let ca = p5.Vector.lerp(c, a, 0.5);

            sierpinski(a, ab, ca, level - 1);
            sierpinski(ab, b, bc, level - 1);
            sierpinski(ca, bc, c, level - 1);
        }
    }

    function drawHill() {
        fill(0, 80, 0);
        beginShape();
        let xoff = 0;
        vertex(0, height);
        for (let x = 0; x <= width; x += 10) {
            let y = hillY - noise(xoff) * 200;
        if (x > width*0.90 && x < width*99 && pathHeight===0) {
            pathHeight = y;
            pathX = x;
            console.log(pathX, pathHeight);

        }

            vertex(x, y);
            xoff += 0.02;
        }
        vertex(width, height);
        endShape(CLOSE);
    }

    function drawTree(x, y, size, depth) {
        // trunk
        fill(100, 60, 20);
        rect(x - size * 0.05, y+size, size * 0.1, size * 0.4);

        // leaves
        let a = createVector(x, y);
        let b = createVector(x - size / 2, y + size);
        let c = createVector(x + size / 2, y + size);
        sierpinski(a, b, c, depth);
    }
    function mouseClicked() {
        if (mouseX > pathX-50 && mouseX < pathX+50) {
            alert("the path takes you onward to the something of something!");

        }
        if (mouseX < 150 && mouseY < 150) {
            if (backgroundCol == (0,0,0,40)) {
                backgroundCol = (51, 72, 134);
                cirCol=color(255, 255,0,255);
            } else {
                cirCol=color(255,255,255,255);
                backgroundCol = (0,0,0,40);
            }

        }
    }
    function draw() {
        background(backgroundCol);
        fill(cirCol);
        circle(0,0,150);
        drawHill();
        fill(255, 255, 255);
        stroke(128, 112, 85)
        strokeWeight(width/30)
        line(pathX, height, pathX, pathHeight+width/60);
        noStroke();
        if (millis() - lastUpdate > 1000) {
            depth=(depth+1)%maxDepth;
            lastUpdate = millis();
        }

        // draw trees
        for (let i = 0; i < numTrees; i++) {
            let x = map(i, 0, numTrees - 1, width * 0.0, width * 0.8);
            let randomNumber = Math.random();
            let baseY = hillY - noise(i * 8) * 80;
            let size = 100 - noise(i * 8) * 80;
            drawTree(x, baseY - size, size, depth);
            drawTree(x+treeOffsets[i], baseY + size*0.7, size*1.3, depth);
        }
    }
    </script>
    </body>
</html>
<style>
.card {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
    transition: 0.3s;
    z-index: 10;
    background-color: rgb(167, 196, 221);
    margin: auto;
    display: flex;
}

.card:hover {
    position: absolute;
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2);
}

.container {
    padding: 2px 16px;
}
</style>