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| package test.triangle;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.util.Objects;
public final class Main {
public static void main(final String... args) {
SwingUtilities.invokeLater(() -> launch(args));
}
private static final void launch(final String... args) {
final var canvas1 = new BitmapCanvas();
final var canvas2 = new BitmapCanvas();
canvas2.setRenderMethod(BitmapCanvas.RenderMethod.ROTATE);
final var canvas3 = new GeomCanvas();
final var angleSlider = new JSlider(0, 360 * 10);
angleSlider.setMajorTickSpacing(180 * 10);
angleSlider.setMinorTickSpacing(45 * 10);
angleSlider.setPaintTicks(true);
angleSlider.setValue((int) canvas1.getAlpha() * 10);
angleSlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
final double value = angleSlider.getValue() / 10d;
canvas1.setAlpha(value);
canvas2.setAlpha(value);
canvas3.setAlpha(value);
}
});
final var d1Slider = new JSlider(100 * 10, 200 * 10);
d1Slider.setMajorTickSpacing(50 * 10);
d1Slider.setMinorTickSpacing(10 * 10);
d1Slider.setPaintTicks(true);
d1Slider.setValue((int) canvas1.getD1() * 10);
d1Slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
final double value = d1Slider.getValue() / 10d;
canvas1.setD1(value);
canvas2.setD1(value);
canvas3.setD1(value);
}
});
final var cxSlider = new JSlider(-300, 300);
cxSlider.setValue((int) canvas1.getCOffsetX());
cxSlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
final double value = cxSlider.getValue();
canvas1.setCOffsetX(value);
canvas2.setCOffsetX(value);
canvas3.setCOffsetX(value);
}
});
final var cySlider = new JSlider(-300, 300);
cySlider.setValue((int) canvas1.getCOffsetY());
cySlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
final double value = cySlider.getValue();
canvas1.setCOffsetY(value);
canvas2.setCOffsetY(value);
canvas3.setCOffsetY(value);
}
});
final var sidePanel = new JPanel();
sidePanel.setMinimumSize(new Dimension(200, 200));
sidePanel.setPreferredSize(new Dimension(200, 200));
sidePanel.setLayout(new BoxLayout(sidePanel, BoxLayout.Y_AXIS));
sidePanel.add(angleSlider, 0);
sidePanel.add(d1Slider, 1);
sidePanel.add(cxSlider, 2);
sidePanel.add(cySlider, 3);
final var centerPanel = new JPanel();
centerPanel.setLayout(new FlowLayout());
centerPanel.add(canvas1);
centerPanel.add(canvas2);
centerPanel.add(canvas3);
final var main = new JFrame();
main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
main.getContentPane().setLayout(new BorderLayout());
main.getContentPane().add(centerPanel, BorderLayout.CENTER);
main.getContentPane().add(sidePanel, BorderLayout.EAST);
main.setTitle("Test");
main.setVisible(true);
main.pack();
}
private static abstract class CanvasBase extends JComponent {
protected final Stroke SOLID_STROKE_0_5 = new BasicStroke(0.5f);
protected final Stroke DASHED_STROKE_0_5 = new BasicStroke(0.5f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{3f, 3f}, 0);
protected final Stroke SOLID_STROKE_1_0 = new BasicStroke(1f);
protected final String ALPHA_PATTERN = "α = %.2f°";
protected final String A_LABEL = "A";
protected final String B_LABEL = "B";
protected final String C_LABEL = "C";
protected final String B_PRIME_LABEL = "B'";
protected final String C_PRIME_LABEL = "C'";
protected final Color OUTER_CIRCLE_COLOR = Color.LIGHT_GRAY;
protected final Color TRIANGLE_COLOR = Color.BLACK;
protected final Color ALPHA_COLOR = Color.GREEN.darker();
protected final double ALPHA_VISUAL_RADIUS = 15;
protected final double POINT_VISUAL_RADIUS = 3;
public CanvasBase() {
super();
setMinimumSize(new Dimension(500, 500));
setPreferredSize(new Dimension(500, 500));
}
@Override
protected void paintComponent(final Graphics g) {
super.paintComponent(g);
g.setColor(Color.WHITE);
g.clearRect(0, 0, getWidth(), getHeight());
}
private final double ax = 250;
public double getAx() {
return ax;
}
private final double ay = 250;
public double getAy() {
return ay;
}
private double cOffsetX = 230;
public double getCOffsetX() {
return cOffsetX;
}
public void setCOffsetX(final double value) {
cOffsetX = value;
repaint();
}
private double cOffsetY = 100;
public double getCOffsetY() {
return cOffsetY;
}
public void setCOffsetY(final double value) {
cOffsetY = value;
repaint();
}
private double alpha = 30;
public void setAlpha(final double value) {
alpha = value;
repaint();
}
public double getAlpha() {
return alpha;
}
private double d1 = 100;
public void setD1(final double value) {
d1 = value;
repaint();
}
public double getD1() {
return d1;
}
}
private static final class BitmapCanvas extends CanvasBase {
private static enum RenderMethod {
ROTATE,
FULL_COMPUTE;
}
public BitmapCanvas() {
}
private RenderMethod renderMethod = RenderMethod.FULL_COMPUTE;
public void setRenderMethod(final RenderMethod value) {
renderMethod = Objects.isNull(value) ? RenderMethod.FULL_COMPUTE : value;
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
final var g2d = (Graphics2D) g.create();
try {
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setStroke(SOLID_STROKE_1_0);
g2d.setColor(Color.BLUE);
g2d.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2d.setColor(Color.BLACK);
g2d.drawString("BITMAP " + renderMethod, 10, getHeight() - 20);
final double alphaDegree = getAlpha();
final double alphaRadian = Math.toRadians(alphaDegree);
final double d1 = getD1();
// A.
final double x1 = getAx();
final double y1 = getAy();
// B' & B.
final double x21 = x1 + d1;
final double y21 = y1;
final double x22 = x1 + d1 * Math.cos(alphaRadian);
final double y22 = y1 - d1 * Math.sin(alphaRadian); // Invert Y axis for screen.
// C' & C.
final double x31 = x1 + getCOffsetX();
final double y31 = y1 - getCOffsetY(); // Invert Y axis for screen.
final double d3 = Math.sqrt(Math.pow(x31 - x1, 2) + Math.pow(y31 - y1, 2));
final double betaRadian = - calculateAngle(x1, y1, x31, y31); // Invert Y axis for screen.
final double x32 = x1 + d3 * Math.cos(alphaRadian + betaRadian);
final double y32 = y1 - d3 * Math.sin(alphaRadian + betaRadian); // Invert Y axis for screen.
// Angle label.
final double alphaLabelX = x1 + (ALPHA_VISUAL_RADIUS + 5) * Math.cos(alphaRadian / 2);
final double alphaLabelY = y1 - (ALPHA_VISUAL_RADIUS + 5) * Math.sin(alphaRadian / 2); // Invert Y axis for screen.
// Outer circle.
g2d.setColor(OUTER_CIRCLE_COLOR);
g2d.setStroke(SOLID_STROKE_0_5);
g2d.drawOval((int) (x1 - d1), (int) (y1 - d1), (int) (2 * d1), (int) (2 * d1));
// Angle.
g2d.setColor(ALPHA_COLOR);
g2d.setStroke(SOLID_STROKE_0_5);
g2d.fillArc((int) (x1 - ALPHA_VISUAL_RADIUS), (int) (y1 - ALPHA_VISUAL_RADIUS), (int) (ALPHA_VISUAL_RADIUS * 2), (int) (ALPHA_VISUAL_RADIUS * 2), 0, (int) alphaDegree);
g2d.setColor(ALPHA_COLOR.darker());
final var angleLabel = ALPHA_PATTERN.formatted(alphaDegree);
g2d.drawString(angleLabel, (int) alphaLabelX, (int) alphaLabelY);
// Reference points
g2d.setStroke(DASHED_STROKE_0_5);
// B'.
g2d.setColor(Color.RED);
g2d.drawLine((int) x1, (int) y1, (int) x21, (int) y21);
g2d.fillOval((int) (x21 - POINT_VISUAL_RADIUS), (int) (y21 - POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS));
g2d.drawString(B_PRIME_LABEL, (int) x21 + 20, (int) y21);
// C'.
g2d.setStroke(DASHED_STROKE_0_5);
g2d.setColor(Color.BLUE);
g2d.drawLine((int) x1, (int) y1, (int) x31, (int) y31);
g2d.drawLine((int) x21, (int) y21, (int) x31, (int) y31);
g2d.fillOval((int) (x31 - POINT_VISUAL_RADIUS), (int) (y31 - POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS));
g2d.drawString(C_PRIME_LABEL, (int) x31 + 20, (int) y31);
// Triangle.
g2d.setColor(TRIANGLE_COLOR);
g2d.setStroke(SOLID_STROKE_1_0);
// A.
g2d.fillOval((int) (x1 - POINT_VISUAL_RADIUS), (int) (y1 - POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS));
g2d.drawString(A_LABEL, (int) x1 - 20, (int) y1);
// B.
g2d.drawLine((int) x1, (int) y1, (int) x22, (int) y22);
g2d.fillOval((int) (x22 - POINT_VISUAL_RADIUS), (int) (y22 - POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS));
g2d.drawString(B_LABEL, (int) x22 + 20, (int) y22);
// C.
switch (renderMethod) {
case ROTATE -> {
g2d.rotate(-alphaRadian, x1, y1); // Invert Y axis for screen.
g2d.drawLine((int) x1, (int) y1, (int) x31, (int) y31);
g2d.drawLine((int) x21, (int) y21, (int) x31, (int) y31);
g2d.fillOval((int) (x31 - POINT_VISUAL_RADIUS), (int) (y31 - POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS));
// Need another rotation to make label horizontal.
g2d.rotate(alphaRadian, x31, y31); // Invert Y axis for screen.
g2d.drawString(C_LABEL, (int) x31 + 20, (int) y31);
// Undo all rotations in case we need to draw something else.
g2d.rotate(-alphaRadian, x31, y31); // Invert Y axis for screen.
g2d.rotate(alphaRadian, x1, y1); // Invert Y axis for screen.
}
default -> {
g2d.drawLine((int)x1, (int)y1, (int) x32, (int) y32);
g2d.drawLine((int)x22, (int)y22, (int) x32, (int) y32);
g2d.fillOval((int) (x32 - POINT_VISUAL_RADIUS), (int) (y32 - POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS), (int) (2 * POINT_VISUAL_RADIUS));
g2d.drawString(C_LABEL, (int) x32 + 20, (int) y32);
}
}
} finally {
g2d.dispose();
}
}
}
private static final class GeomCanvas extends CanvasBase {
public GeomCanvas() {
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
final var g2d = (Graphics2D) g.create();
try {
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setStroke(SOLID_STROKE_1_0);
g2d.setColor(Color.CYAN);
g2d.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2d.setColor(Color.BLACK);
g2d.drawString("VECTOR", 10, getHeight() - 20);
final double alphaDegree = getAlpha();
final double alphaRadian = Math.toRadians(alphaDegree);
final double d1 = getD1();
// A.
final double x1 = getAx();
final double y1 = getAy();
// B' & B.
final double x21 = x1 + d1;
final double y21 = y1;
final double x22 = x1 + d1 * Math.cos(alphaRadian);
final double y22 = y1 - d1 * Math.sin(alphaRadian); // Invert Y axis for screen.
// C' & C.
final double x31 = x1 + getCOffsetX();
final double y31 = y1 - getCOffsetY(); // Invert Y axis for screen.
final double d3 = Math.sqrt(Math.pow(x31 - x1, 2) + Math.pow(y31 - y1, 2));
final double betaRadian = - calculateAngle(x1, y1, x31, y31); // Invert Y axis for screen.
final double x32 = x1 + d3 * Math.cos(alphaRadian + betaRadian);
final double y32 = y1 - d3 * Math.sin(alphaRadian + betaRadian); // Invert Y axis for screen.
// Angle label.
final double alphaLabelX = x1 + (ALPHA_VISUAL_RADIUS + 5) * Math.cos(alphaRadian / 2);
final double alphaLabelY = y1 - (ALPHA_VISUAL_RADIUS + 5) * Math.sin(alphaRadian / 2); // Invert Y axis for screen.
// Outer circle.
circle.setFrameFromCenter(x1, y1, x1 - d1, y1 - d1);
g2d.setColor(OUTER_CIRCLE_COLOR);
g2d.setStroke(SOLID_STROKE_0_5);
g2d.draw(circle);
// Angle.
arc.setAngleStart(0);
arc.setArcByCenter(x1, y1, ALPHA_VISUAL_RADIUS, 0, alphaDegree, Arc2D.PIE);
g2d.setColor(ALPHA_COLOR);
g2d.setStroke(SOLID_STROKE_0_5);
g2d.fill(arc);
g2d.setColor(ALPHA_COLOR.darker());
final var angleLabel = ALPHA_PATTERN.formatted(alphaDegree);
g2d.drawString(angleLabel, (int) alphaLabelX, (int) alphaLabelY);
// Reference points
g2d.setStroke(DASHED_STROKE_0_5);
// B'.
g2d.setColor(Color.RED);
line.setLine(x1, y1, x21, y21);
g2d.draw(line);
circle.setFrameFromCenter(x21, y21, x21 - POINT_VISUAL_RADIUS, y21 - POINT_VISUAL_RADIUS);
g2d.fill(circle);
g2d.drawString(B_PRIME_LABEL, (int) x21 + 20, (int) y21);
// C'.
g2d.setColor(Color.BLUE);
line.setLine(x1, y1, x31, y31);
g2d.draw(line);
line.setLine(x21, y21, x31, y31);
g2d.draw(line);
circle.setFrameFromCenter(x31, y31, x31 - POINT_VISUAL_RADIUS, y31 - POINT_VISUAL_RADIUS);
g2d.fill(circle);
g2d.drawString(C_PRIME_LABEL, (int) x31 + 20, (int) y31);
// Triangle.
g2d.setColor(TRIANGLE_COLOR);
g2d.setStroke(SOLID_STROKE_1_0);
// A.
circle.setFrameFromCenter(x1, y1, x1 - POINT_VISUAL_RADIUS, y1 - POINT_VISUAL_RADIUS);
g2d.fill(circle);
g2d.drawString(A_LABEL, (int) x1 - 20, (int) y1);
// B.
line.setLine(x1, y1, x22, y22);
g2d.draw(line);
circle.setFrameFromCenter(x22, y22, x22 - POINT_VISUAL_RADIUS, y22 - POINT_VISUAL_RADIUS);
g2d.fill(circle);
g2d.drawString(B_LABEL, (int) x22 + 20, (int) y22);
// C.
line.setLine(x1, y1, x32, y32);
g2d.draw(line);
line.setLine(x22, y22, x32, y32);
g2d.draw(line);
circle.setFrameFromCenter(x32, y32, x32 - POINT_VISUAL_RADIUS, y32 - POINT_VISUAL_RADIUS);
g2d.fill(circle);
g2d.drawString(C_LABEL, (int) x32 + 20, (int) y32);
} finally {
g2d.dispose();
}
}
private final Ellipse2D circle = new Ellipse2D.Double();
private final Arc2D arc = new Arc2D.Double();
private final Line2D line = new Line2D.Double();
}
public static double calculateAngle(double x1, double y1, double x2, double y2) throws RuntimeException {
if (x1 == x2 && y1 == y2) {
throw new RuntimeException("Value not defined");
}
double a = x2 - x1;
double b = y2 - y1;
double theta = Math.atan2(b, a);
// Normalize to [0, 2*PI[
if (theta < 0) {
theta += 2 * Math.PI;
}
return theta;
}
} |
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