40 lines
1.3 KiB
TypeScript
40 lines
1.3 KiB
TypeScript
module SpaceTac.View {
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"use strict";
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// Common UI tools functions
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export class Tools {
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// Constraint an angle in radians the ]-pi;pi] range.
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static normalizeAngle(angle: number): number {
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angle = angle % (2 * Math.PI);
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if (angle <= -Math.PI) {
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return angle + 2 * Math.PI;
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} else if (angle > Math.PI) {
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return angle - 2 * Math.PI;
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} else {
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return angle;
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}
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}
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// Interpolate a rotation value
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// This will take into account the 2*pi modulo
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static rotationTween(tween: Phaser.Tween, dest: number, property: string = "rotation"): void {
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// Immediately change the object's current rotation to be in range (-pi,pi)
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var value = Tools.normalizeAngle(tween.target[property]);
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tween.target[property] = value;
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// Update the tween
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dest = Tools.normalizeAngle(dest);
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if (value - dest > Math.PI) {
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dest += 2 * Math.PI;
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} else if (value - dest < -Math.PI) {
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dest -= 2 * Math.PI;
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}
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console.log(value, dest);
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var changes: Object = {};
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changes[property] = dest;
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tween.to(changes);
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}
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}
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}
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