64 lines
1.4 KiB
Java
64 lines
1.4 KiB
Java
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package ch.nuth.zhaw.exbox;
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public class Turtle {
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private static StringBuffer b;
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private static double x, y;
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private static double angle;
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private static Turtle theTurtle;
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public static Turtle instance() {
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if (theTurtle == null) {
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theTurtle = new Turtle();
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}
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return theTurtle;
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}
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public Turtle() {
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this(0, 0);
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}
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public Turtle(double x, double y) {
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reset(x, y);
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theTurtle = this;
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}
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public void reset(double x, double y) {
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b = new StringBuffer();
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Turtle.x = x;
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Turtle.y = y;
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angle = 0;
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}
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public void clear() {
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reset(0, 0);
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}
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public String getTrace() {
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return b.toString();
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}
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private double round(double d) {
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return Math.round(d * 10000) / 10000.0;
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}
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public void move(double dist) {
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b.append("<line x1=\"");
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b.append(Double.toString(round(x)));
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b.append("\" y1=\"");
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b.append(Double.toString(round(y)));
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b.append("\" ");
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x += Math.cos(angle) * dist;
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y += Math.sin(angle) * dist;
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b.append("x2=\"");
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b.append(Double.toString(round(x)));
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b.append("\" y2=\"");
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b.append(Double.toString(round(y)));
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b.append("\"/>\n");
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}
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public void turn(double turnAngle) {
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angle += turnAngle * Math.PI / 180;
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}
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}
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