114 lines
2.9 KiB
Java
114 lines
2.9 KiB
Java
import codedraw.CodeDraw;
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/**
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* This class represents vectors in a 3D vector space.
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*/
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public class Vector3 {
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private double x;
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private double y;
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private double z;
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public Vector3() {
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this(0);
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}
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public Vector3(double v) {
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this(v, v, v);
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}
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public Vector3(double x, double y, double z) {
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this.x = x;
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this.y = y;
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this.z = z;
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}
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public Vector3(Vector3 other) {
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this(other.x, other.y, other.z);
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}
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/**
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* Returns the sum of this vector and vector 'v'.
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*/
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public Vector3 plus(Vector3 v) {
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return new Vector3(x + v.x, y + v.y, z + v.z);
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}
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/**
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* Returns the product of this vector and 'd'.
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*/
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public Vector3 times(double d) {
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return new Vector3(x * d, y * d, z * d);
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}
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/**
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* Returns the sum of this vector and -1*v.
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*/
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public Vector3 minus(Vector3 v) {
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return new Vector3(x - v.x, y - v.y, z - v.z);
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}
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/**
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* Returns the Euclidean distance of this vector
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* to the specified vector 'v'.
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*/
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public double distanceTo(Vector3 v) {
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double dX = x - v.x;
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double dY = y - v.y;
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double dZ = z - v.z;
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return Math.sqrt(dX * dX + dY * dY + dZ * dZ);
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}
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/**
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* Returns the length (norm) of this vector.
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*/
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public double length() {
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return distanceTo(new Vector3());
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}
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/**
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* Normalizes this vector: changes the length of this vector such that it becomes 1.
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* The direction and orientation of the vector is not affected.
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*/
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public void normalize() {
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double length = length();
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x /= length;
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y /= length;
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z /= length;
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}
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public double getScreenX(CodeDraw cd) {
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return cd.getWidth() * (this.x + Simulation.SECTION_SIZE / 2) / Simulation.SECTION_SIZE;
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}
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public double getScreenY(CodeDraw cd) {
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return cd.getWidth() * (this.y + Simulation.SECTION_SIZE / 2) / Simulation.SECTION_SIZE;
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}
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/**
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* Draws a filled circle with a specified radius centered at the (x,y) coordinates of this vector
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* in the canvas associated with 'cd'. The z-coordinate is not used.
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*/
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public void drawAsFilledCircle(CodeDraw cd, double radius) {
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radius = cd.getWidth() * radius / Simulation.SECTION_SIZE;
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cd.fillCircle(getScreenX(cd), getScreenY(cd), Math.max(radius, 1.5));
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}
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/**
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* Returns the coordinates of this vector in brackets as a string
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* in the form "[x,y,z]", e.g., "[1.48E11,0.0,0.0]".
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*/
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@Override
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public String toString() {
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return String.format("[%g,%g,%g]", x, y, z);
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}
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@Override
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public boolean equals(Object other) {
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if (other.getClass() != Vector3.class) {
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return false;
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}
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Vector3 v = (Vector3) other;
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return this.x == v.x && this.y == v.y && this.z == v.z;
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}
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}
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