|
| 1 | +class StageCompanion { |
| 2 | + constructor() { |
| 3 | + this.canvas = null; |
| 4 | + this.ctx = null; |
| 5 | + this.img = null; |
| 6 | + this.bumpAudio = "https://raw.githubusercontent.com/FloppyDisk-OSC/extensions-assets/main/smb_bump.wav"; |
| 7 | + this.kickAudio = "https://raw.githubusercontent.com/FloppyDisk-OSC/extensions-assets/main/smb_kick.wav"; |
| 8 | + this.oneUpAudio = "https://raw.githubusercontent.com/FloppyDisk-OSC/extensions-assets/main/smb_1-up.wav"; |
| 9 | + this.balls = []; |
| 10 | + this.running = false; |
| 11 | + this.mouseX = -999; |
| 12 | + this.mouseY = -999; |
| 13 | + this.mouseRadius = 20; |
| 14 | + this.mouseHandler = null; |
| 15 | + this.audioCtx = new (window.AudioContext || window.webkitAudioContext)(); |
| 16 | + } |
| 17 | + |
| 18 | + getInfo() { |
| 19 | + return { |
| 20 | + id: "stagecompanion", |
| 21 | + name: "Stage Brah", |
| 22 | + blocks: [ |
| 23 | + { |
| 24 | + opcode: "spawnBall", |
| 25 | + blockType: Scratch.BlockType.COMMAND, |
| 26 | + text: "spawn brah with speed [SPEED] px/s and size [SIZE]", |
| 27 | + arguments: { |
| 28 | + SPEED: { type: Scratch.ArgumentType.NUMBER, defaultValue: 2 }, |
| 29 | + SIZE: { type: Scratch.ArgumentType.NUMBER, defaultValue: 32 } |
| 30 | + } |
| 31 | + }, |
| 32 | + { |
| 33 | + opcode: "remove", |
| 34 | + blockType: Scratch.BlockType.COMMAND, |
| 35 | + text: "remove all brahs" |
| 36 | + } |
| 37 | + ] |
| 38 | + }; |
| 39 | + } |
| 40 | + |
| 41 | + spawnBall(args) { |
| 42 | + const speed = Number(args.SPEED) || 2; |
| 43 | + const size = Number(args.SIZE) || 32; |
| 44 | + if (!this.running) { |
| 45 | + this.running = true; |
| 46 | + this.initCanvas(); |
| 47 | + this.initImage(); |
| 48 | + this.initMouseTracking(); |
| 49 | + this.loop(); |
| 50 | + } |
| 51 | + const angle = Math.random() * Math.PI * 2; |
| 52 | + const ball = { |
| 53 | + x: 240 + (Math.random() - 0.5) * 50, |
| 54 | + y: 180 + (Math.random() - 0.5) * 50, |
| 55 | + vx: Math.cos(angle) * speed, |
| 56 | + vy: Math.sin(angle) * speed, |
| 57 | + size: size, |
| 58 | + squash: 1, |
| 59 | + squashDir: 0, |
| 60 | + consecutiveMouseHits: 0, |
| 61 | + comboDisplay: 0, |
| 62 | + comboAlpha: 0 |
| 63 | + }; |
| 64 | + this.balls.push(ball); |
| 65 | + } |
| 66 | + |
| 67 | + initCanvas() { |
| 68 | + const stage = document.querySelector("canvas").parentElement; |
| 69 | + this.canvas = document.createElement("canvas"); |
| 70 | + this.canvas.width = 480; |
| 71 | + this.canvas.height = 360; |
| 72 | + this.canvas.style.position = "absolute"; |
| 73 | + this.canvas.style.left = "0"; |
| 74 | + this.canvas.style.top = "0"; |
| 75 | + this.canvas.style.pointerEvents = "none"; |
| 76 | + this.canvas.style.zIndex = "10"; |
| 77 | + stage.appendChild(this.canvas); |
| 78 | + this.ctx = this.canvas.getContext("2d"); |
| 79 | + } |
| 80 | + |
| 81 | + initImage() { |
| 82 | + this.img = new Image(); |
| 83 | + this.img.src = "https://raw.githubusercontent.com/FloppyDisk-OSC/extensions-assets/main/brah.webp"; |
| 84 | + } |
| 85 | + |
| 86 | + initMouseTracking() { |
| 87 | + if (this.mouseHandler) window.removeEventListener("mousemove", this.mouseHandler); |
| 88 | + this.mouseHandler = (e) => { |
| 89 | + const r = this.canvas.getBoundingClientRect(); |
| 90 | + this.mouseX = e.clientX - r.left; |
| 91 | + this.mouseY = e.clientY - r.top; |
| 92 | + }; |
| 93 | + window.addEventListener("mousemove", this.mouseHandler); |
| 94 | + } |
| 95 | + |
| 96 | + remove() { |
| 97 | + this.running = false; |
| 98 | + if (this.canvas) this.canvas.remove(); |
| 99 | + this.canvas = null; |
| 100 | + this.balls = []; |
| 101 | + if (this.mouseHandler) { |
| 102 | + window.removeEventListener("mousemove", this.mouseHandler); |
| 103 | + this.mouseHandler = null; |
| 104 | + } |
| 105 | + } |
| 106 | + |
| 107 | + playSound(url, pitch = 1) { |
| 108 | + const ctx = this.audioCtx; |
| 109 | + fetch(url) |
| 110 | + .then(r => r.arrayBuffer()) |
| 111 | + .then(buf => ctx.decodeAudioData(buf)) |
| 112 | + .then(decoded => { |
| 113 | + const source = ctx.createBufferSource(); |
| 114 | + source.buffer = decoded; |
| 115 | + source.playbackRate.value = pitch; |
| 116 | + source.connect(ctx.destination); |
| 117 | + source.start(); |
| 118 | + }) |
| 119 | + .catch(() => {}); |
| 120 | + } |
| 121 | + |
| 122 | + loop() { |
| 123 | + if (!this.running) return; |
| 124 | + this.update(); |
| 125 | + requestAnimationFrame(() => this.loop()); |
| 126 | + } |
| 127 | + |
| 128 | + update() { |
| 129 | + if (!this.ctx) return; |
| 130 | + this.ctx.clearRect(0, 0, 480, 360); |
| 131 | + |
| 132 | + for (let ball of this.balls) { |
| 133 | + const half = ball.size / 2; |
| 134 | + ball.x += ball.vx; |
| 135 | + ball.y += ball.vy; |
| 136 | + |
| 137 | + let wallHit = false; |
| 138 | + if (ball.x < half) { ball.x = half; ball.vx *= -1; wallHit = true; } |
| 139 | + if (ball.x > 480 - half) { ball.x = 480 - half; ball.vx *= -1; wallHit = true; } |
| 140 | + if (ball.y < half) { ball.y = half; ball.vy *= -1; wallHit = true; } |
| 141 | + if (ball.y > 360 - half) { ball.y = 360 - half; ball.vy *= -1; wallHit = true; } |
| 142 | + if (wallHit) { |
| 143 | + this.playSound(this.bumpAudio); |
| 144 | + ball.squashDir = 1; |
| 145 | + ball.consecutiveMouseHits = 0; |
| 146 | + ball.comboDisplay = 0; |
| 147 | + ball.comboAlpha = 0; |
| 148 | + } |
| 149 | + |
| 150 | + const dx = ball.x - this.mouseX; |
| 151 | + const dy = ball.y - this.mouseY; |
| 152 | + const dist = Math.hypot(dx, dy); |
| 153 | + if (dist < this.mouseRadius + half) { |
| 154 | + const nx = dx / dist; |
| 155 | + const ny = dy / dist; |
| 156 | + const speed = Math.hypot(ball.vx, ball.vy); |
| 157 | + ball.vx = nx * speed; |
| 158 | + ball.vy = ny * speed; |
| 159 | + ball.x = Math.min(Math.max(ball.x + nx * 5, half), 480 - half); |
| 160 | + ball.y = Math.min(Math.max(ball.y + ny * 5, half), 360 - half); |
| 161 | + |
| 162 | + ball.consecutiveMouseHits++; |
| 163 | + ball.comboDisplay = ball.consecutiveMouseHits; |
| 164 | + ball.comboAlpha = 1; |
| 165 | + |
| 166 | + if (ball.consecutiveMouseHits <= 7) { |
| 167 | + const pitch = 1 + 0.1 * (ball.consecutiveMouseHits - 1); |
| 168 | + this.playSound(this.kickAudio, pitch); |
| 169 | + } else { |
| 170 | + this.playSound(this.oneUpAudio, 1); |
| 171 | + } |
| 172 | + |
| 173 | + ball.squashDir = 1; |
| 174 | + } |
| 175 | + } |
| 176 | + |
| 177 | + for (let i = 0; i < this.balls.length; i++) { |
| 178 | + for (let j = i + 1; j < this.balls.length; j++) { |
| 179 | + const a = this.balls[i]; |
| 180 | + const b = this.balls[j]; |
| 181 | + const halfA = a.size / 2; |
| 182 | + const halfB = b.size / 2; |
| 183 | + const dx = b.x - a.x; |
| 184 | + const dy = b.y - a.y; |
| 185 | + const dist = Math.hypot(dx, dy); |
| 186 | + if (dist < (halfA + halfB)) { |
| 187 | + const nx = dx / dist; |
| 188 | + const ny = dy / dist; |
| 189 | + const p = 2 * ((a.vx * nx + a.vy * ny) - (b.vx * nx + b.vy * ny)) / 2; |
| 190 | + a.vx -= p * nx; |
| 191 | + a.vy -= p * ny; |
| 192 | + b.vx += p * nx; |
| 193 | + b.vy += p * ny; |
| 194 | + |
| 195 | + const overlap = (halfA + halfB) - dist; |
| 196 | + a.x -= nx * overlap / 2; |
| 197 | + a.y -= ny * overlap / 2; |
| 198 | + b.x += nx * overlap / 2; |
| 199 | + b.y += ny * overlap / 2; |
| 200 | + |
| 201 | + this.playSound(this.bumpAudio); |
| 202 | + a.squashDir = 1; |
| 203 | + b.squashDir = 1; |
| 204 | + } |
| 205 | + } |
| 206 | + } |
| 207 | + |
| 208 | + for (let ball of this.balls) { |
| 209 | + const half = ball.size / 2; |
| 210 | + if (ball.squashDir > 0) { |
| 211 | + ball.squash = 0.7 + Math.random() * 0.6; |
| 212 | + ball.squashDir = 0; |
| 213 | + } else { |
| 214 | + ball.squash += (1 - ball.squash) * 0.2; |
| 215 | + } |
| 216 | + |
| 217 | + this.ctx.save(); |
| 218 | + this.ctx.translate(ball.x, ball.y); |
| 219 | + this.ctx.scale(1, ball.squash); |
| 220 | + this.ctx.drawImage(this.img, -half, -half, ball.size, ball.size); |
| 221 | + this.ctx.restore(); |
| 222 | + |
| 223 | + if (ball.comboDisplay > 0 && ball.comboAlpha > 0) { |
| 224 | + this.ctx.font = `${Math.floor(ball.size / 2.5)}px Arial`; |
| 225 | + this.ctx.fillStyle = `rgba(255,255,255,${ball.comboAlpha})`; |
| 226 | + this.ctx.strokeStyle = `rgba(0,0,0,${ball.comboAlpha})`; |
| 227 | + this.ctx.lineWidth = 2; |
| 228 | + this.ctx.textAlign = "center"; |
| 229 | + this.ctx.fillText(ball.comboDisplay, ball.x, ball.y - half - 10); |
| 230 | + this.ctx.strokeText(ball.comboDisplay, ball.x, ball.y - half - 10); |
| 231 | + ball.comboAlpha -= 0.02; |
| 232 | + if (ball.comboAlpha < 0) ball.comboAlpha = 0; |
| 233 | + } |
| 234 | + } |
| 235 | + } |
| 236 | +} |
| 237 | + |
| 238 | +Scratch.extensions.register(new StageCompanion()); |
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