59 lines
1.4 KiB
Java
59 lines
1.4 KiB
Java
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import java.awt.*;
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import javax.swing.*;
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public class NumberDisplay extends JComponent {
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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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public static final int BACKDROP_WIDTH = 41;
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public static final int BACKDROP_HEIGHT = 25;
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public static final int MINUS_INDEX = 10;
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private static final int[] DIGIT_X = {28, 15, 2};
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private static final int DIGIT_Y = 2;
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public final Image BACKDROP;
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public final Image[] DIGITS;
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private int num;
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private boolean negative;
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public NumberDisplay(Image backdrop, Image[] digits) {
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BACKDROP = backdrop;
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DIGITS = digits;
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setPreferredSize(new Dimension(BACKDROP_WIDTH, BACKDROP_HEIGHT));
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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 g) {
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g.drawImage(BACKDROP, 0, 0, this);
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// Preserve the original num for divison, in case we repaint twice
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// without updating the number
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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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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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num /= 10;
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}
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}
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}
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