improved ui elements

src/Input/InputReceiver.ts

@@ -21,7 +21,8 @@ export default class InputReceiver{
 		this.receiver = new Receiver();
 		this.keyJustPressed = new Map<boolean>();
 		this.keyPressed = new Map<boolean>();
-		this.mousePressPosition = null;
+		this.mousePosition = new Vec2(0, 0);
+		this.mousePressPosition = new Vec2(0, 0);
 
 		this.eventQueue = EventQueue.getInstance();
 		this.eventQueue.subscribe(this.receiver, ["mouse_down", "mouse_up", "mouse_move", "key_down", "key_up", "canvas_blur"]);

src/Nodes/UIElement.ts

@@ -9,12 +9,22 @@ export default class UIElement extends CanvasNode{
 	borderColor: Color;
 	text: string;
 	font: string;
+	fontSize: number;
+	hAlign: string;
+	vAlign: string;
 
 	// EventAttributes
 	onClick: Function;
 	onClickEventId: string;
-	onHover: Function;
-	onHoverEventId: string;
+	onRelease: Function;
+	onReleaseEventId: string;
+	onEnter: Function;
+	onEnterEventId: string;
+	onLeave: Function;
+	onLeaveEventId: string;
+
+	protected isClicked: boolean;
+	protected isEntered: boolean;
 
 	constructor(){
 		super();
@@ -22,13 +32,23 @@ export default class UIElement extends CanvasNode{
 		this.backgroundColor = new Color(0, 0, 0, 0);
 		this.borderColor = new Color(0, 0, 0, 0);
 		this.text = "";
-		this.font = "30px Arial";
+		this.font = "Arial";
+		this.fontSize = 30;
+		this.hAlign = "center";
+		this.vAlign = "center";
 
 		this.onClick = null;
 		this.onClickEventId = null;
+		this.onRelease = null;
+		this.onReleaseEventId = null;
 
-		this.onHover = null;
-		this.onHoverEventId = null;
+		this.onEnter = null;
+		this.onEnterEventId = null;
+		this.onLeave = null;
+		this.onLeaveEventId = null;
+
+		this.isClicked = false;
+		this.isEntered = false;
 	}
 
 	setPosition(vecOrX: Vec2 | number, y: number = null): void {
@@ -61,14 +81,9 @@ export default class UIElement extends CanvasNode{
 
 	update(deltaT: number): void {
 		if(this.input.isMouseJustPressed()){
-			let mousePos = this.input.getMousePressPosition();
-			if(mousePos.x >= this.position.x && mousePos.x <= this.position.x + this.size.x){
-				// Inside x bounds
-				if(mousePos.y >= this.position.y && mousePos.y <= this.position.y + this.size.y){
-					// Inside element
-					if(this.onHover !== null){
-						this.onHover();
-					}
+			let clickPos = this.input.getMousePressPosition();
+			if(this.contains(clickPos.x, clickPos.y)){
+				this.isClicked = true;
 
 				if(this.onClick !== null){
 					this.onClick();
@@ -79,14 +94,83 @@ export default class UIElement extends CanvasNode{
 				}
 			}
 		}
+
+		if(!this.input.isMousePressed()){
+			if(this.isClicked){
+				this.isClicked = false;
 			}
 		}
 
-	render(ctx: CanvasRenderingContext2D, viewportOrigin: Vec2, viewportSize: Vec2){
-		ctx.fillStyle = this.backgroundColor.toStringRGBA();
+		let mousePos = this.input.getMousePosition();
+		if(mousePos && this.contains(mousePos.x, mousePos.y)){
+			this.isEntered = true;
+
+			if(this.onEnter !== null){
+				this.onEnter();
+			}
+			if(this.onEnterEventId !== null){
+				let data = {};
+				this.emit(this.onEnterEventId, data);
+			}
+
+		} else if(this.isEntered) {
+			this.isEntered = false;
+
+			if(this.onLeave !== null){
+				this.onLeave();
+			}
+			if(this.onLeaveEventId !== null){
+				let data = {};
+				this.emit(this.onLeaveEventId, data);
+			}
+		} else if(this.isClicked) {
+			// If mouse is dragged off of element while down, it is not clicked anymore
+			this.isClicked = false;
+		}
+	}
+
+	protected calculateOffset(ctx: CanvasRenderingContext2D): Vec2 {
+		let textWidth = ctx.measureText(this.text).width;
+
+		let offset = new Vec2(0, 0);
+
+		let hDiff = this.size.x - textWidth;
+		if(this.hAlign === "center"){
+			offset.x = hDiff/2;
+		} else if (this.hAlign === "right"){
+			offset.x = hDiff;
+		}
+
+		if(this.vAlign === "top"){
+			ctx.textBaseline = "top";
+			offset.y = 0;
+		} else if (this.vAlign === "bottom"){
+			ctx.textBaseline = "bottom";
+			offset.y = this.size.y;
+		} else {
+			ctx.textBaseline = "middle";
+			offset.y = this.size.y/2;
+		}
+
+		return offset;
+	}
+
+	protected calculateBackgroundColor(): string {
+		return this.backgroundColor.toStringRGBA();
+	}
+
+	protected calculateTextColor(): string {
+		return this.textColor.toStringRGBA();
+	}
+
+	render(ctx: CanvasRenderingContext2D, viewportOrigin: Vec2, viewportSize: Vec2): void {
+		ctx.font = this.fontSize + "px " + this.font;
+		let offset = this.calculateOffset(ctx);
+
+		ctx.fillStyle = this.calculateBackgroundColor();
 		ctx.fillRect(this.position.x - viewportOrigin.x, this.position.y - viewportOrigin.y, this.size.x, this.size.y);
-		ctx.fillStyle = this.textColor.toStringRGBA();
-		ctx.font = this.font;
-		ctx.fillText(this.text, this.position.x - viewportOrigin.x, this.position.y - viewportOrigin.y + 30);
+		
+		ctx.fillStyle = this.calculateTextColor();
+		ctx.fillText(this.text, this.position.x + offset.x - viewportOrigin.x, this.position.y + offset.y - viewportOrigin.y);
 	}
 }

src/Nodes/UIElements/Button.ts

@@ -0,0 +1,23 @@
+import UIElement from "../UIElement";
+import Color from "../../Utils/Color";
+import Vec2 from "../../DataTypes/Vec2";
+
+export default class Button extends UIElement{
+
+	constructor(){
+		super();
+		this.backgroundColor = new Color(150, 75, 203);
+		this.borderColor = new Color(41, 46, 30);
+		this.textColor = new Color(255, 255, 255);
+	}
+
+	protected calculateBackgroundColor(): string {
+		if(this.isEntered && !this.isClicked){
+			return this.backgroundColor.lighten().toStringRGBA();
+		} else if(this.isClicked){
+			return this.backgroundColor.darken().toStringRGBA();
+		} else {
+			return this.backgroundColor.toStringRGBA();
+		}
+	}
+}

src/Nodes/UIElements/Label.ts

@@ -0,0 +1,8 @@
+import UIElement from "../UIElement";
+
+export default class Label extends UIElement{
+	constructor(text: string){
+		super();
+		this.text = text;
+	}
+}

src/Utils/Color.ts

@@ -13,18 +13,26 @@ export default class Color{
         this.a = a;
 	}
 
+	lighten(): Color {
+		return new Color(MathUtils.clamp(this.r + 40, 0, 255), MathUtils.clamp(this.g + 40, 0, 255), MathUtils.clamp(this.b + 40, 0, 255), this.a);
+	}
+
+	darken(): Color {
+		return new Color(MathUtils.clamp(this.r - 40, 0, 255), MathUtils.clamp(this.g - 40, 0, 255), MathUtils.clamp(this.b - 40, 0, 255), this.a);
+	}
+	
 	toString(): string {
 		return "#" + MathUtils.toHex(this.r, 2) + MathUtils.toHex(this.g, 2) + MathUtils.toHex(this.b, 2);
 	}
 
-	toStringRGB(){
+	toStringRGB(): string {
 		return "rgb(" + this.r.toString() + ", " + this.g.toString() + ", " + this.b.toString() + ")";
 	}
 
-	toStringRGBA(){
+	toStringRGBA(): string {
 		if(this.a === null){
-			throw "No alpha value assigned to color";
+			return this.toStringRGB();
 		}
-		return "rgb(" + this.r.toString() + ", " + this.g.toString() + ", " + this.b.toString() + ", " + this.a.toString() +")"
+		return "rgba(" + this.r.toString() + ", " + this.g.toString() + ", " + this.b.toString() + ", " + this.a.toString() +")"
 	}
 }

src/main.ts

@@ -4,6 +4,7 @@ import Player from "./Nodes/Player";
 import UIElement from "./Nodes/UIElement";
 import ColoredCircle from "./Nodes/ColoredCircle";
 import Color from "./Utils/Color";
+import Button from "./Nodes/UIElements/Button";
 
 function main(){
     // Create the game object
@@ -15,31 +16,27 @@ function main(){
     // Initialize GameObjects
     let player = new Player();
 
-    let recordButton = new UIElement();
+    let recordButton = new Button();
     recordButton.setSize(100, 50);
     recordButton.setText("Record");
-    recordButton.setBackgroundColor(new Color(200, 100, 0, 0.3));
     recordButton.setPosition(400, 30);
     recordButton.onClickEventId = "record_button_press";
 
-    let stopButton = new UIElement();
+    let stopButton = new Button();
     stopButton.setSize(100, 50);
     stopButton.setText("Stop");
-    stopButton.setBackgroundColor(new Color(200, 0, 0, 0.3));
     stopButton.setPosition(550, 30);
     stopButton.onClickEventId = "stop_button_press";
 
-    let playButton = new UIElement();
+    let playButton = new Button();
     playButton.setSize(100, 50);
     playButton.setText("Play");
-    playButton.setBackgroundColor(new Color(0, 200, 0, 0.3));
     playButton.setPosition(700, 30);
     playButton.onClickEventId = "play_button_press";
 
-    let cycleFramerateButton = new UIElement();
+    let cycleFramerateButton = new Button();
     cycleFramerateButton.setSize(150, 50);
     cycleFramerateButton.setText("Cycle FPS");
-    cycleFramerateButton.setBackgroundColor(new Color(200, 0, 200, 0.3));
     cycleFramerateButton.setPosition(5, 400);
     let i = 0;
     let fps = [15, 30, 60];
@@ -48,10 +45,9 @@ function main(){
         i = (i + 1) % 3;
     }
 
-    let pauseButton = new UIElement();
+    let pauseButton = new Button();
     pauseButton.setSize(100, 50);
     pauseButton.setText("Pause");
-    pauseButton.setBackgroundColor(new Color(200, 0, 200, 1));
     pauseButton.setPosition(700, 400);
     pauseButton.onClick = () => {
         game.getGameState().addScene(pauseMenu);
@@ -62,10 +58,9 @@ function main(){
     modalBackground.setBackgroundColor(new Color(0, 0, 0, 0.4));
     modalBackground.setPosition(200, 100);
 
-    let resumeButton = new UIElement();
+    let resumeButton = new Button();
     resumeButton.setSize(100, 50);
     resumeButton.setText("Resume");
-    resumeButton.setBackgroundColor(new Color(200, 0, 200, 1));
     resumeButton.setPosition(400, 200);
     resumeButton.onClick = () => {
         game.getGameState().removeScene();