74 lines
1.9 KiB
Java
74 lines
1.9 KiB
Java
import java.awt.*;
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import javax.swing.*;
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// The number displays in the game
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public class NumberDisplay extends JComponent {
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// The dimensions of each individual digit
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public static final int DIGIT_WIDTH = 11;
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public static final int DIGIT_HEIGHT = 21;
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// The dimensions of the big box
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public static final int BACKDROP_WIDTH = 41;
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public static final int BACKDROP_HEIGHT = 25;
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// The index of the minus sign
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public static final int MINUS_INDEX = 10;
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// The x-positions of each digit: units -> tens -> hundreds
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private static final int[] DIGIT_X = {28, 15, 2};
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// The y-position of each digit
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private static final int DIGIT_Y = 2;
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public Image backdrop;
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public Image[] digits;
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private int num;
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private boolean negative;
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public NumberDisplay() {
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setPreferredSize(new Dimension(BACKDROP_WIDTH, BACKDROP_HEIGHT));
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}
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public void setImages(Image[] digits, Image backdrop) {
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this.digits = digits;
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this.backdrop = backdrop;
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}
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public void setNum(int num) {
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setClamped(num);
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repaint();
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}
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private void setClamped(int num) {
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// Clamp all number assignments between -99 and 999, inclusive
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if (num < 0) {
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this.num = Math.min(-num, 99);
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negative = true;
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} else {
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this.num = Math.min(num, 999);
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negative = false;
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}
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}
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@Override
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public void paintComponent(Graphics gr) {
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super.paintComponent(gr);
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Graphics2D g = (Graphics2D) gr;
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g.drawImage(backdrop, 0, 0, this);
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// Preserve the original num for in-place divison, because we don't want
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// non-graphical side effects in paintComponent
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int num = this.num;
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for (int i = 0; i < 3; i++) {
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int digitsIndex;
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// Get the index of the proper digit for this position, drawing the
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// minus sign in the hundreds digit if necessary
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if (negative && i == 2)
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digitsIndex = MINUS_INDEX;
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else
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digitsIndex = num % 10;
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g.drawImage(digits[digitsIndex], DIGIT_X[i], DIGIT_Y, this);
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// Next digit
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num /= 10;
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}
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}
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}
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