105 lines
3.6 KiB
TypeScript
105 lines
3.6 KiB
TypeScript
module TK.SpaceTac.UI {
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export type IBounded = {
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x: number
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y: number
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width: number
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height: number
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}
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/**
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* Destroy all children of a Phaser object
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*
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* This is a workaround for a removeChildren bug
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*/
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export function destroyChildren(obj: Phaser.Image | Phaser.Sprite | Phaser.Group, start = 0, end = obj.children.length - 1) {
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obj.children.slice(start, end + 1).forEach(child => (<any>child).destroy());
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}
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// Common UI tools functions
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export class UITools {
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/**
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* Get the position of an object, adjusted to remain inside a container
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*/
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static positionInside(obj: IBounded, container: IBounded): [number, number] {
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let y = obj.y;
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if (y + obj.height > container.height) {
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y = container.height - obj.height;
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}
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if (y < container.y) {
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y = container.y;
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}
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let x = obj.x;
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if (x + obj.width > container.width) {
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x = container.width - obj.width;
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}
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if (x < container.x) {
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x = container.x;
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}
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return [x, y];
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}
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/**
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* Reposition an object to remain inside a container
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*/
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static keepInside(obj: Phaser.Button | Phaser.Sprite | Phaser.Image | Phaser.Group | Phaser.Graphics, rect: IBounded) {
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let objbounds = obj.getBounds();
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let [x, y] = UITools.positionInside({ x: obj.x, y: obj.y, width: objbounds.width, height: objbounds.height }, rect);
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if (x != obj.x || y != obj.y) {
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obj.position.set(x, y);
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}
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}
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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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/**
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* Evenly space identical items in a parent
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*
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* Returns the relative position of item's center inside parent_width
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*/
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static evenlySpace(parent_width: number, item_width: number, item_count: number): number[] {
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if (item_width * item_count <= parent_width) {
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let spacing = parent_width / item_count;
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return range(item_count).map(i => (i + 0.5) * spacing);
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} else {
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let breadth = parent_width - item_width;
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let spacing = breadth / (item_count - 1);
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return range(item_count).map(i => item_width / 2 + i * spacing);
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}
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}
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/**
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* Draw a background around a container
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*
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* Content's top-left corner is supposed to be at (0,0)
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*/
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static drawBackground(content: Phaser.Group | Phaser.Text, background: Phaser.Graphics, border = 6): [number, number] {
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let bounds = content.getBounds();
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let width = bounds.width + 2 * border;
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let height = bounds.height + 2 * border;
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if (background.width != width || background.height != height) {
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background.clear();
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background.lineStyle(2, 0x404450);
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background.beginFill(0x202225, 0.9);
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background.drawRect(-border, -border, width, height);
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background.endFill();
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}
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return [width, height];
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}
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}
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}
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