JGame2D/src/de/miaurizius/jgame2d/core/UI.java

package de.miaurizius.jgame2d.core;

import de.miaurizius.jgame2d.core.enums.GameState;
import de.miaurizius.jgame2d.entity.Entity;
import de.miaurizius.jgame2d.entity.item.HeartObj;

import java.awt.*;
import java.awt.image.BufferedImage;

public class UI {

    GamePanel panel;
    Graphics2D graphics2d;
    Font arial_40, arial_80B; //TODO: Custom font loader: https://www.youtube.com/watch?v=g-wrebFVP3E
    BufferedImage heart_full, heart_half, heart_blank;
    public String currentDialogue;
    public int commandNum;

    public UI(GamePanel panel) {
        this.panel = panel;
        arial_40 = new Font("Arial", Font.PLAIN, 40);
        arial_80B = new Font("Arial", Font.BOLD, 80);

        // CREATE HUD OBJECT
        Entity heart = new HeartObj(panel);
        heart_full = heart.image;
        heart_half = heart.image2;
        heart_blank = heart.image3;
    }

    public void draw(Graphics2D graphics2d) {
        this.graphics2d = graphics2d;
        graphics2d.setFont(arial_40);
        graphics2d.setColor(Color.white);

        if(panel.gameState == null) return;
        switch (panel.gameState) {
            case GameState.PLAY:
                drawPlayerLife();
                break;
            case GameState.PAUSE:
                drawPlayerLife();
                drawPauseScreen();
                break;
            case GameState.DIALOGUE:
                drawPlayerLife();
                drawDialogueScreen();
                break;
            case TITLE:
                drawTitleScreen();
                break;
        }
    }

    // HUD
    public void drawPlayerLife() {
        int x = panel.tileSize / 2;
        int y = panel.tileSize / 2;
        int i = 0;

        // DRAW MAX HEART
        while(i<panel.player.maxLife/2) {
            graphics2d.drawImage(heart_blank, x, y, null);
            i++;
            x += panel.tileSize;
        }

        // RESET
        x = panel.tileSize / 2;
        i = 0;

        // DRAW CURRENT LIFE
        while(i<panel.player.life) {
            graphics2d.drawImage(heart_half, x, y, null);
            i++;
            if(i < panel.player.life) graphics2d.drawImage(heart_full, x, y, null);
            i++;
            x += panel.tileSize;
        }
    }

    // GAME STATES
    public void drawPauseScreen() {
        graphics2d.setFont(graphics2d.getFont().deriveFont(Font.PLAIN, 80));
        String text = "PAUSED";
        int y = panel.screenHeight / 2;
        graphics2d.drawString(text, getCenteredX(text), y);
    }
    public void drawDialogueScreen() {
        // WINDOW
        int x = panel.tileSize*2;
        int y = panel.tileSize/2;
        int width = panel.screenWidth - (panel.tileSize*4);
        int height = panel.tileSize*4;
        drawSubWindow(x, y, width, height);

        graphics2d.setFont(graphics2d.getFont().deriveFont(Font.PLAIN, 28F));
        x += panel.tileSize;
        y += panel.tileSize;

        for(String line : currentDialogue.split("\n")) {
            graphics2d.drawString(line, x, y);
            y += 40;
        }
    }
    public void drawTitleScreen() {
        graphics2d.setColor(new Color(0, 0, 0));
        graphics2d.fillRect(0, 0, panel.screenWidth, panel.screenHeight);

        // TITLE NAME
        graphics2d.setFont(graphics2d.getFont().deriveFont(Font.BOLD, 96F));
        String text = "JGame2D";
        int x = getCenteredX(text);
        int y  = panel.tileSize*3;

        // SHADOW
        graphics2d.setColor(Color.gray);
        graphics2d.drawString(text, x+5, y+5);

        // MAIN COLOR
        graphics2d.setColor(Color.white);
        graphics2d.drawString(text, x, y);

        // MENU
        graphics2d.setFont(graphics2d.getFont().deriveFont(Font.BOLD, 48F));
        text = "NEW GAME";
        x = getCenteredX(text);
        y += panel.tileSize*4;
        graphics2d.drawString(text, x, y);
        if(commandNum == 0) graphics2d.drawString(">", x-panel.tileSize, y);

        text = "LOAD GAME";
        x = getCenteredX(text);
        y += panel.tileSize;
        graphics2d.drawString(text, x, y);
        if(commandNum == 1) graphics2d.drawString(">", x-panel.tileSize, y);

        text = "QUIT";
        x = getCenteredX(text);
        y += panel.tileSize;
        graphics2d.drawString(text, x, y);
        if(commandNum == 2) graphics2d.drawString(">", x-panel.tileSize, y);
    }

    // UTILITY
    public void drawSubWindow(int x, int y, int width, int height) {
        graphics2d.setColor(new Color(0,0,0,210));
        graphics2d.fillRoundRect(x, y, width, height, 35, 35);
        graphics2d.setColor(new Color(255,255,255));
        graphics2d.setStroke(new BasicStroke(5));
        graphics2d.drawRoundRect(x+5, y+5, width-10, height-10, 25, 25);
    }
    public int getCenteredX(String text) {
        return panel.screenWidth / 2 - (int) graphics2d.getFontMetrics().getStringBounds(text, graphics2d).getWidth() / 2;
    }

}