91 lines
2.6 KiB
JavaScript
91 lines
2.6 KiB
JavaScript
// 摄像机：跟随 / 锁定 / 缩放（坑向关的"摄像头"道具靠它搞事）
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import { clamp, lerp } from './util.js';
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export class Camera {
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constructor(w = 800, h = 608) {
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this.w = w; this.h = h;
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this.x = 0; this.y = 0;
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this.zoom = 1;
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this.tz = 1;
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this.mode = 'follow';
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this.lockX = 0; this.lockY = 0;
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this.shakeX = 0; this.shakeY = 0;
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this.snapped = false;
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}
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reset(level, player) {
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this.zoom = 1; this.tz = 1; this.mode = 'follow';
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this.snapTo(player, level);
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}
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viewW() { return this.w / this.zoom; }
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viewH() { return this.h / this.zoom; }
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snapTo(player, level) {
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this.x = clamp(player.cx - this.viewW() / 2, 0, Math.max(0, level.pxW - this.viewW()));
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this.y = clamp(player.cy - this.viewH() / 2, 0, Math.max(0, level.pxH - this.viewH()));
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this.mode = 'follow';
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this.zoom = 1; this.tz = 1;
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}
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update(level, player, dt) {
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const zone = level.camZone;
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let tx, ty, tz = 1, speed = 0.16;
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if (zone) {
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if (zone.mode === 'lock') {
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this.mode = 'lock';
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tx = zone.lx !== null ? zone.lx : zone.x;
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ty = zone.ly !== null ? zone.ly : zone.y;
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tz = zone.zoom || 1;
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speed = 0.05; // 缓慢移动，制造迷失感
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} else if (zone.mode === 'zoom') {
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this.mode = 'zoom';
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tz = zone.zoom || 1;
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tx = player.cx - this.w / tz / 2;
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ty = player.cy - this.h / tz / 2;
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speed = 0.14;
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} else if (zone.mode === 'off') {
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this.mode = 'off';
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tx = this.x; ty = this.y; tz = zone.zoom || this.zoom; speed = 0;
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}
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} else {
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this.mode = 'follow';
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tx = player.cx - this.w / this.zoom / 2;
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ty = player.cy - this.h / this.zoom / 2;
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tz = 1;
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speed = 0.16;
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}
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this.tz = lerp(this.tz, tz, 0.06);
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if (Math.abs(this.tz - this.zoom) > 0.002) this.zoom = this.tz;
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if (speed > 0) {
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this.x = lerp(this.x, tx, speed);
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this.y = lerp(this.y, ty, speed);
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}
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this.clampToLevel(level);
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// 抖动
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const sh = level.shake || 0;
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if (sh > 0.2) {
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this.shakeX = (Math.random() - 0.5) * sh;
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this.shakeY = (Math.random() - 0.5) * sh;
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} else { this.shakeX = 0; this.shakeY = 0; }
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}
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clampToLevel(level) {
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const vw = this.viewW(), vh = this.viewH();
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if (level.pxW <= vw) { this.x = (level.pxW - vw) / 2; }
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else this.x = clamp(this.x, 0, level.pxW - vw);
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if (level.pxH <= vh) { this.y = (level.pxH - vh) / 2; }
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else this.y = clamp(this.y, 0, level.pxH - vh);
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}
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apply(ctx) {
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ctx.translate(this.shakeX, this.shakeY);
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if (this.zoom !== 1) ctx.scale(this.zoom, this.zoom);
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ctx.translate(-this.x, -this.y);
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}
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}
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