54 lines
1.7 KiB
TypeScript
54 lines
1.7 KiB
TypeScript
module SpaceTac.Game {
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"use strict";
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// Target for a capability
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// This could be a location in space, or a ship
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export class Target {
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// Coordinates of the target
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x: number;
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y: number;
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// If the target is a ship, this attribute will be set
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ship: Ship;
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// Standard constructor
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constructor(x: number, y: number, ship: Ship) {
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this.x = x;
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this.y = y;
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this.ship = ship;
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}
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// Constructor to target a single ship
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static newFromShip(ship: Ship): Target {
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return new Target(ship.arena_x, ship.arena_y, ship);
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}
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// Constructor to target a location in space
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static newFromLocation(x: number, y: number): Target {
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return new Target(x, y, null);
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}
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// Check if a target is in range from a specific point
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isInRange(x: number, y: number, radius: number): boolean {
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var dx = this.x - x;
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var dy = this.y - y;
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var length = Math.sqrt(dx * dx + dy * dy);
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return (length <= radius);
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}
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// Constraint a target, to be in a given range from a specific point
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// May return the original target if it's already in radius
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constraintInRange(x: number, y: number, radius: number): Target {
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var dx = this.x - x;
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var dy = this.y - y;
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var length = Math.sqrt(dx * dx + dy * dy);
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if (length <= radius) {
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return this;
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} else {
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var factor = radius / length;
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return Target.newFromLocation(x + dx * factor, y + dy * factor);
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}
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}
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}
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}
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