From f1998c321a4eec6d75b58d84aa8610971bf21979 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sat, 31 Jul 2021 11:35:39 -0600
Subject: move static files into static sub-dir, refactor nix a bit

---
 src/_posts/2021-04-11-ripple-v2.md | 436 -------------------------------------
 1 file changed, 436 deletions(-)
 delete mode 100644 src/_posts/2021-04-11-ripple-v2.md

(limited to 'src/_posts/2021-04-11-ripple-v2.md')

diff --git a/src/_posts/2021-04-11-ripple-v2.md b/src/_posts/2021-04-11-ripple-v2.md
deleted file mode 100644
index cbde032..0000000
--- a/src/_posts/2021-04-11-ripple-v2.md
+++ /dev/null
@@ -1,436 +0,0 @@
----
-title: >-
-    Ripple V2: A Better Game
-description: >-
-    The sequel no one was waiting for!
-tags: tech
-series: ripple
----
-
-<p>
-    <b>Movement:</b> Arrow keys or WASD<br/>
-    <b>Jump:</b> Space<br/>
-    <b>Goal:</b> Jump as many times as possible without touching a ripple!<br/>
-    <br/>
-    <b>Press Jump To Begin!</b>
-</p>
-
-_Who can make the muddy water clear?<br/>
-Let it be still, and it will gradually become clear._
-
-<canvas id="canvas"
-        style="border:1px dashed #AAA"
-        tabindex=0>
-Your browser doesn't support canvas. At this point in the world that's actually
-pretty cool, well done!
-</canvas>
-<button onclick="reset()">(R)eset</button>
-<span style="font-size: 2rem; margin-left: 1rem;">Score:
-    <span style="font-weight: bold" id="score">0</span>
-</span>
-
-<script type="text/javascript">
-
-const palette = [
-    "#264653",
-    "#2A9D8F",
-    "#E9C46A",
-    "#F4A261",
-    "#E76F51",
-];
-
-const width = 800;
-const height = 600;
-
-function hypotenuse(w, h) {
-    return Math.sqrt(Math.pow(w, 2) + Math.pow(h, 2));
-}
-
-let canvas = document.getElementById("canvas");
-canvas.width = width;
-canvas.height = height;
-
-const whitelistedKeys = {
-    "ArrowUp": {},
-    "KeyW": {map: "ArrowUp"},
-    "ArrowLeft": {},
-    "KeyA": {map: "ArrowLeft"},
-    "ArrowRight": {},
-    "KeyD": {map: "ArrowRight"},
-    "ArrowDown": {},
-    "KeyS": {map: "ArrowDown"},
-    "Space": {},
-    "KeyR": {},
-};
-
-let keyboard = {};
-
-canvas.addEventListener('keydown', (event) => {
-    let keyInfo = whitelistedKeys[event.code];
-    if (!keyInfo) return;
-
-    let code = event.code;
-    if (keyInfo.map) code = keyInfo.map;
-
-    event.preventDefault();
-    keyboard[code] = true;
-});
-
-canvas.addEventListener('keyup', (event) => {
-    let keyInfo = whitelistedKeys[event.code];
-    if (!keyInfo) return;
-
-    let code = event.code;
-    if (keyInfo.map) code = keyInfo.map;
-
-    event.preventDefault();
-    delete keyboard[code];
-});
-
-
-const C = 700; // scales the overall speed of the radius
-const T = 500; // on which tick the radius change becomes linear
-
-/*
-    f(x) = sqrt(C*x)                        when x < T
-           (C/(2*sqrt(CT)))(x-T) + sqrt(CT) when x >= T
-
-    radius(x) = f(x) + playerRadius;
-*/
-
-const F1 = (x) => Math.sqrt(C*x);
-const F2C1 = C / (2 * Math.sqrt(C*T));
-const F2C2 = Math.sqrt(C * T);
-const F2 = (x) => (F2C1 * (x - T)) + F2C2;
-const F = (x) => {
-    if (x < T) return F1(x);
-    return F2(x);
-};
-
-class Ripple {
-
-    constructor(id, currTick, x, y, bounces, color) {
-        this.id = id;
-        this.tick = currTick;
-        this.x = x;
-        this.y = y;
-        this.thickness = Math.pow(bounces+1, 1.25);
-        this.color = color;
-        this.winner = false;
-
-        this.maxRadius = hypotenuse(x, y);
-        this.maxRadius = Math.max(this.maxRadius, hypotenuse(width-x, y));
-        this.maxRadius = Math.max(this.maxRadius, hypotenuse(x, height-y));
-        this.maxRadius = Math.max(this.maxRadius, hypotenuse(width-x, height-y));
-    }
-
-    radius(currTick) {
-        const x = currTick - this.tick;
-        return F(x) + playerRadius;
-    }
-
-    draw(ctx, currTick) {
-        ctx.beginPath();
-        ctx.arc(this.x, this.y, this.radius(currTick), 0, Math.PI * 2, false);
-        ctx.closePath();
-        ctx.lineWidth = this.thickness;
-        ctx.strokeStyle = this.winner ? "#FF0000" : this.color;
-        ctx.stroke();
-    }
-
-    canGC(currTick) {
-        return this.radius(currTick) > this.maxRadius;
-    }
-}
-
-const playerRadius = 10;
-const playerMoveAccel = 0.5;
-const playerMoveDecel = 0.7;
-const playerMaxMoveSpeed = 4;
-const playerJumpSpeed = 0.08;
-const playerMaxHeight = 1;
-const playerGravity = 0.01;
-
-class Player{
-
-    constructor(x, y, color) {
-        this.x = x;
-        this.y = y;
-        this.z = 0;
-        this.xVelocity = 0;
-        this.yVelocity = 0;
-        this.zVelocity = 0;
-        this.color = color;
-        this.falling = false;
-        this.lastJumpHeight = 0;
-        this.loser = false;
-    }
-
-    act() {
-        if (keyboard["ArrowUp"]) {
-            this.yVelocity = Math.max(-playerMaxMoveSpeed, this.yVelocity - playerMoveAccel);
-        } else if (keyboard["ArrowDown"]) {
-            this.yVelocity = Math.min(playerMaxMoveSpeed, this.yVelocity + playerMoveAccel);
-        } else if (this.yVelocity > 0) {
-            this.yVelocity = Math.max(0, this.yVelocity - playerMoveDecel);
-        } else if (this.yVelocity < 0) {
-            this.yVelocity = Math.min(0, this.yVelocity + playerMoveDecel);
-        }
-
-        this.y += this.yVelocity;
-        this.y = Math.max(0+playerRadius, this.y);
-        this.y = Math.min(height-playerRadius, this.y);
-
-        if (keyboard["ArrowLeft"]) {
-            this.xVelocity = Math.max(-playerMaxMoveSpeed, this.xVelocity - playerMoveAccel);
-        } else if (keyboard["ArrowRight"]) {
-            this.xVelocity = Math.min(playerMaxMoveSpeed, this.xVelocity + playerMoveAccel);
-        } else if (this.xVelocity > 0) {
-            this.xVelocity = Math.max(0, this.xVelocity - playerMoveDecel);
-        } else if (this.xVelocity < 0) {
-            this.xVelocity = Math.min(0, this.xVelocity + playerMoveDecel);
-        }
-
-        this.x += this.xVelocity;
-        this.x = Math.max(0+playerRadius, this.x);
-        this.x = Math.min(width-playerRadius, this.x);
-
-        let jumpHeld = keyboard["Space"];
-
-        if (jumpHeld && !this.falling && this.z < playerMaxHeight) {
-            this.lastJumpHeight = 0;
-            this.zVelocity = playerJumpSpeed;
-        } else {
-            this.zVelocity = Math.max(-playerJumpSpeed, this.zVelocity - playerGravity);
-            this.falling = this.z > 0;
-        }
-
-        let prevZ = this.z;
-        this.z = Math.max(0, this.z + this.zVelocity);
-        this.lastJumpHeight = Math.max(this.z, this.lastJumpHeight);
-    }
-
-    draw(ctx) {
-        let y = this.y - (this.z * 40);
-        let radius = playerRadius * (this.z+1)
-
-        // draw main
-        ctx.beginPath();
-        ctx.arc(this.x, y, radius, 0, Math.PI * 2, false);
-        ctx.closePath();
-        ctx.lineWidth = 0;
-        ctx.fillStyle = this.color;
-        ctx.fill();
-        if (this.loser) {
-            ctx.strokeStyle = '#FF0000';
-            ctx.lineWidth = 2;
-            ctx.stroke();
-        }
-
-        // draw shadow, if in the air
-        if (this.z > 0) {
-            let radius = Math.max(0, playerRadius * (1.2 - this.z));
-            ctx.beginPath();
-            ctx.arc(this.x, this.y, radius, 0, Math.PI * 2, false);
-            ctx.closePath();
-            ctx.lineWidth = 0;
-            ctx.fillStyle = this.color+"33";
-            ctx.fill();
-        }
-    }
-}
-
-class Game {
-
-    constructor(canvas, scoreEl) {
-        this.currTick = 0;
-        this.player = new Player(width/2, height/2, palette[0]);
-        this.state = 'play';
-        this.score = 0;
-        this.scoreEl = scoreEl;
-        this.canvas = canvas;
-        this.ctx = canvas.getContext("2d");
-        this.ripples = [];
-        this.nextRippleID = 0;
-    }
-
-    shouldReset() {
-        return keyboard['KeyR'];
-    }
-
-    newRippleID() {
-        let id = this.nextRippleID;
-        this.nextRippleID++;
-        return id;
-    }
-
-    // newRipple initializes and stores a new ripple at the given coordinates, as
-    // well as all sub-ripples which make up the initial ripple's reflections.
-    newRipple(x, y, bounces, color) {
-        color = color ? color : palette[Math.floor(Math.random() * palette.length)];
-
-        let ripplePos = [];
-        let nextRipples = [];
-
-        let addRipple = (x, y) => {
-            for (let i in ripplePos) {
-                if (ripplePos[i][0] == x && ripplePos[i][1] == y) return;
-            }
-
-            let ripple = new Ripple(this.newRippleID(), this.currTick, x, y, bounces, color);
-            nextRipples.push(ripple);
-            ripplePos.push([x, y]);
-            this.ripples.push(ripple);
-        };
-
-        // add initial ripple, after this we deal with the sub-ripples.
-        addRipple(x, y);
-
-        while (bounces > 0) {
-            bounces--;
-            let prevRipples = nextRipples;
-            nextRipples = [];
-
-            for (let i in prevRipples) {
-                let prevX = prevRipples[i].x;
-                let prevY = prevRipples[i].y;
-                addRipple(prevX, -prevY);
-                addRipple(-prevX, prevY);
-                addRipple((2*this.canvas.width)-prevX, prevY);
-                addRipple(prevX, (2*this.canvas.height)-prevY);
-            }
-        }
-    }
-
-    // playerRipplesState returns a mapping of rippleID -> boolean, where each
-    // boolean indicates the ripple's relation to the player at the moment. true
-    // indicates the player is outside the ripple, false indicates the player is
-    // within the ripple.
-    playerRipplesState() {
-        let state = {};
-        for (let i in this.ripples) {
-            let ripple = this.ripples[i];
-            let rippleRadius = ripple.radius(this.currTick);
-            let hs = Math.pow(ripple.x-this.player.x, 2) + Math.pow(ripple.y-this.player.y, 2);
-            state[ripple.id] = hs > Math.pow(rippleRadius + playerRadius, 2);
-        }
-        return state;
-    }
-
-    playerHasJumpedOverRipple(prev, curr) {
-        for (const rippleID in prev) {
-            if (!curr.hasOwnProperty(rippleID)) continue;
-            if (curr[rippleID] != prev[rippleID]) return true;
-        }
-        return false;
-    }
-
-    update() {
-        if (this.state != 'play') return;
-
-        let playerPrevZ = this.player.z;
-        this.player.act();
-
-        if (playerPrevZ == 0 && this.player.z > 0) {
-            // player has jumped
-            this.prevPlayerRipplesState = this.playerRipplesState();
-
-        } else if (playerPrevZ > 0 && this.player.z == 0) {
-
-            // player has landed, don't produce a ripple unless there are no
-            // existing ripples or the player jumped over an existing one.
-            if (
-                this.ripples.length == 0 ||
-                this.playerHasJumpedOverRipple(
-                    this.prevPlayerRipplesState,
-                    this.playerRipplesState()
-                )
-            ) {
-                let bounces = Math.floor((this.player.lastJumpHeight*1.8)+1);
-                console.log("spawning ripple with bounces:", bounces);
-                this.newRipple(this.player.x, this.player.y, bounces);
-                this.score += bounces;
-            }
-        }
-
-        if (this.player.z == 0) {
-            for (let i in this.ripples) {
-                let ripple = this.ripples[i];
-                let rippleRadius = ripple.radius(this.currTick);
-                if (rippleRadius < playerRadius * 1.5) continue;
-                let hs = Math.pow(ripple.x-this.player.x, 2) + Math.pow(ripple.y-this.player.y, 2);
-                if (hs > Math.pow(rippleRadius + playerRadius, 2)) {
-                    continue;
-                } else if (hs <= Math.pow(rippleRadius - playerRadius, 2)) {
-                    continue;
-                } else {
-                    console.log("game over", ripple);
-                    ripple.winner = true;
-                    this.player.loser = true;
-                    this.state = 'gameOver';
-                    // deliberately don't break here, in case multiple ripples hit
-                    // the player on the same frame
-                }
-            }
-        }
-
-        this.ripples = this.ripples.filter(ripple => !ripple.canGC(this.currTick));
-
-        this.currTick++;
-    }
-
-    draw() {
-        this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
-        this.ripples.forEach(ripple => ripple.draw(this.ctx, this.currTick));
-        this.player.draw(this.ctx)
-        this.scoreEl.innerHTML = this.score;
-    }
-}
-
-
-const requestAnimationFrame =
-    window.requestAnimationFrame ||
-    window.mozRequestAnimationFrame ||
-    window.webkitRequestAnimationFrame ||
-    window.msRequestAnimationFrame;
-
-let game = new Game(canvas, document.getElementById("score"));
-
-function reset() {
-    game = new Game(canvas, document.getElementById("score"));
-}
-
-function nextFrame() {
-    if (game.shouldReset()) reset();
-
-    game.update()
-    game.draw()
-    requestAnimationFrame(nextFrame);
-}
-requestAnimationFrame(nextFrame);
-
-canvas.focus();
-
-</script>
-
-## Changelog
-
-There's been two major changes to the mechanics of the game since the previous
-version:
-
-* A new ripple is created _only_ if there are no ripples on the field already,
-  or if the player has jumped over an existing ripple.
-
-* The score is increased only if a ripple is created, and is increased by the
-  number of bounces off the wall that ripple will have. Put another way, the
-  score is increased based on how high you jump.
-
-Other small changes include:
-
-* Ripple growth rate has been modified. It's now harder for a player to run into
-  the ripple they just created.
-
-* Ripple thickness indicates how many bounces are left in the ripple. This was
-  the case previously, but it's been made more obvious.
-
-* Small performance improvements.
-- 
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