113 lines
3.1 KiB
JavaScript
113 lines
3.1 KiB
JavaScript
import {key} from './input.js';
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import {createTerrain, clipTerrain, isTerrain} from './terrain.js';
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import {createCanvas, drawCircle, drawLine, plot, drawParagraph, loop, drawText} from './gfx.js';
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import {wrap, clamp, parable, deg2rad, vec} from './math.js';
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import {drawExplosion, WEAPONS} from './weapons.js';
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const W = 384; const H = 240; const Z = 3;
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let state = 'aim';
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const players = [];
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let currentPlayer = 0;
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let projectile = null;
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// Init canvas
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const fb = createCanvas(W, H);
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fb.canvas.style.width = `${W * Z}px`;
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fb.canvas.style.height = `${H * Z}px`;
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document.body.appendChild(fb.canvas);
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// Init terrain
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const terrain = createTerrain(W, H);
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// Init projectiles
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const projectiles = createCanvas(W, H);
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// Init players
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players.push({x:100, y:H-80, a:0, p:100, c:'red', weapon:WEAPONS[0]});
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players.push({x:220, y:H-80, a:0, p:100, c:'blue', weapon:WEAPONS[1]});
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function update() {
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if (state === 'aim') {
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const player = players[currentPlayer];
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const {x, y, a, p} = player;
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if (key('ArrowLeft')) {
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player.a = wrap(0, a -1, 180);
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} else if (key('ArrowRight')) {
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player.a = wrap(0, a +1, 180);
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} else if (key('ArrowUp')) {
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player.p = clamp(100, p +5, 1000);
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} else if (key('ArrowDown')) {
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player.p = clamp(100, p -5, 1000);
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} else if (key(' ')) {
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state = 'fire';
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fadeProjectiles();
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const [px, py] = vec(x, y, a+180, 10);
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projectile = {
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player: player,
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weapon: player.weapon,
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ox:px, oy:py, a, p,
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x:0, y:0, t: 0,
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};
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}
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}
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else if (state === 'fire') {
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for (let i=0; i<10; i++) {
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const {weapon, ox, oy, a, p, t} = projectile;
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const [x, y] = parable(t, ox, oy, deg2rad(180+a), p/10, 9.8);
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projectile.t += 0.01;
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projectile.x = Math.round(x);
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projectile.y = Math.round(y);
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if (y > H || isTerrain(terrain, x, y)) {
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clipTerrain(terrain, (ctx) => drawExplosion(ctx, projectile.x, projectile.y, weapon.xr));
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currentPlayer = wrap(0, currentPlayer+1, players.length);
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projectile = null;
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state = 'aim';
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return;
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}
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}
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}
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}
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function draw() {
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fb.clearRect(0, 0, W, H);
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fb.drawImage(terrain.canvas, 0, 0);
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if (projectile) drawProjectile();
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fb.drawImage(projectiles.canvas, 0, 0);
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for (let tank of players) drawPlayer(tank);
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}
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function drawPlayer(player) {
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const {x, y, a, c} = player;
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const [px, py] = vec(x, y, a+180, 10);
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drawLine(fb, x, y, Math.round(px), Math.round(py), c);
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drawStatus();
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}
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function drawProjectile() {
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const {x, y, player} = projectile;
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plot(projectiles, x, y, player.c);
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}
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function fadeProjectiles() {
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const imageData = projectiles.getImageData(0, 0, W, H);
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for (let i=0; i<imageData.data.length; i+=4) imageData.data[i+3] -= 25;
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projectiles.clearRect(0, 0, W, H);
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projectiles.putImageData(imageData, 0, 0);
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}
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function drawStatus() {
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const player = players[currentPlayer];
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const {weapon} = player;
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drawText(fb, `AIM=${player.a} PWR=${player.p}`, 8, 8, player.c, 'left');
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drawText(fb, `${weapon.name}`, W-8, 8, player.c, 'right');
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}
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loop(() => {
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update();
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draw();
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});
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