94 lines
2.8 KiB
JavaScript
94 lines
2.8 KiB
JavaScript
/**
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* Handles user input events and modifies state.
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* Core logic comes through this class.
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*/
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goog.provide('ascii.Controller');
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goog.require('ascii.Vector');
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goog.require('ascii.View');
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/** @const */ var DRAG_LATENCY = 200; // Milliseconds.
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/** @const */ var DRAG_ACCURACY = 5; // Pixels.
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/**
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* @constructor
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*/
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ascii.Controller = function(view, state) {
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/** @type {ascii.View} */ this.view = view;
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/** @type {ascii.State} */ this.state = state;
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/** @type {ascii.Vector} */ this.dragOrigin;
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/** @type {ascii.Vector} */ this.pressVector;
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/** @type {number} */ this.pressTimestamp;
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this.installDesktopBindings();
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};
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ascii.Controller.prototype.handlePress = function(x, y) {
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this.pressVector = new ascii.Vector(x, y);
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this.pressTimestamp = $.now();
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};
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ascii.Controller.prototype.handleMove = function(x, y) {
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var position = new ascii.Vector(x, y);
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if (this.pressVector == null) { return; } // No clicks, so just ignore.
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// Initiate a drag if we have moved enough, quickly enough.
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if (this.dragOrigin == null &&
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($.now() - this.pressTimestamp) < DRAG_LATENCY &&
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position.subtract(this.pressVector).length() > DRAG_ACCURACY) {
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this.dragOrigin = this.view.offset;
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}
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// Drag in progress, update the view origin.
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if (this.dragOrigin != null) {
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this.view.offset = this.dragOrigin.add(
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this.pressVector
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.subtract(new ascii.Vector(x, y))
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.scale(1/this.view.zoom));
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}
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// Drag wasn't initiated in time, treat this as a drawing event.
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if (this.dragOrigin == null && ($.now() - this.pressTimestamp) >= DRAG_LATENCY) {
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// TODO: Draw stuff.
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this.state.getCell(this.view.screenToCell(position)).value = 'O';
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}
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};
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ascii.Controller.prototype.handleRelease = function(x, y) {
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var position = new ascii.Vector(x, y);
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// Drag wasn't initiated in time, treat this as a drawing event.
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if (this.dragOrigin == null &&
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($.now() - this.pressTimestamp) >= DRAG_LATENCY &&
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position.subtract(this.pressVector).length() > DRAG_ACCURACY) {
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// TODO: Draw stuff.
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}
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this.pressVector = null;
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this.pressTimestamp = 0;
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this.dragOrigin = null;
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};
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ascii.Controller.prototype.handleZoom = function(delta) {
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this.view.zoom *= delta > 0 ? 1.1 : 0.9;
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this.view.zoom = Math.max(Math.min(this.view.zoom, 5), 0.2);
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};
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ascii.Controller.prototype.installDesktopBindings = function() {
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var controller = this;
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$(this.view.canvas).bind('mousewheel', function(e) {
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controller.handleZoom(e.originalEvent.wheelDelta);
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});
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$(this.view.canvas).mousedown(function(e) {
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controller.handlePress(e.clientX, e.clientY);
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});
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$(this.view.canvas).mouseup(function(e) {
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controller.handleRelease(e.clientX, e.clientY);
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});
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$(this.view.canvas).mousemove(function(e) {
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controller.handleMove(e.clientX, e.clientY);
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});
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$(window).resize(function(e) { controller.view.resizeCanvas() });
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};
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