72 lines
1.8 KiB
JavaScript
72 lines
1.8 KiB
JavaScript
import BoundingRectangle from "./BoundingRectangle.js"
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export default class Camera {
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constructor(canvas) {
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this.x = 0
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this.y = 0
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// TODO: when canvas resizes, this should
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// syncronize with the cam
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this.width = canvas.width
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this.height = canvas.height
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this.zoom = 1
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this.minZoom = .2
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this.maxZoom = 6
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this.zoomStep = .05
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}
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rect() {
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return new BoundingRectangle(
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- this.x,
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- this.x + (this.width / this.zoom),
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- this.y,
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- this.y + (this.height / this.zoom),
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)
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}
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move(x, y) {
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this.x += x / this.zoom
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this.y += y / this.zoom
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}
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zoomOut() {
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const newzoom = Math.max(this.zoom - this.zoomStep, this.minZoom)
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if (newzoom !== this.zoom) {
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// centered zoom
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this.x -= ((this.width / this.zoom) - (this.width / newzoom)) / 2
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this.y -= ((this.height / this.zoom) - (this.height / newzoom)) / 2
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this.zoom = newzoom
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return true
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}
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return false
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}
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zoomIn() {
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const newzoom = Math.min(this.zoom + this.zoomStep, this.maxZoom)
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if (newzoom !== this.zoom) {
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// centered zoom
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this.x -= ((this.width / this.zoom) - (this.width / newzoom)) / 2
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this.y -= ((this.height / this.zoom) - (this.height / newzoom)) / 2
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this.zoom = newzoom
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return true
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}
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return false
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}
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translateMouse(mouse) {
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return {
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x: (mouse.x / this.zoom) - this.x,
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y: (mouse.y / this.zoom) - this.y,
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}
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}
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translateMouseBack(mouse) {
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return {
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x: (mouse.x + this.x) * this.zoom,
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y: (mouse.y + this.y) * this.zoom,
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}
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}
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}
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