检查矩形是否与文本相交

Question

我有一个叫做“MapObject”的类，它允许你定义它是什么，它做什么。我最近为此添加了文本，它工作正常，但是碰撞是一个矩形，在某些情况下并不可怕，但是我更喜欢有一个与文本匹配的碰撞框（也就是检查 1x1 矩形是否与文本，但仍然可以在字母之间）

我尝试了以下方法：

GlyphVector vec = ob.font.createGlyphVector(new Canvas().getFontMetrics(ob.font).getFontRenderContext(), ob.text);

Shape textSh = vec.getOutline();

Area obSh = new Area(new Rectangle(x,y,o.width,o.height));

obSh.intersect(new Area(textSh));

boolean inter = !obSh.isEmpty();

但是它不起作用，我想是因为位置，但是我不知道如何在其中添加位置。谢谢。

Answer 1

您可能需要做的一件事是将GlyphVector或翻译成Rectangle正确的上下文。我的意思是， the GlyphVectoronly 代表原点处0x0的文本，因此如果文本显示在屏幕上的其他地方，那么您将无法获得正确的表示。幸运的是，有人真的考虑过这个用例并提供了一些功能来实现它。有关GlyphVector#getOutline(float, float)更多详细信息，请参阅。然后你可以使用它像......import java.awt.Color;import java.awt.Dimension;import java.awt.EventQueue;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Point;import java.awt.Rectangle;import java.awt.Shape;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.font.FontRenderContext;import java.awt.font.GlyphVector;import java.awt.geom.Rectangle2D;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Random;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.Timer;public class Test {&nbsp; &nbsp; public static void main(String[] args) {&nbsp; &nbsp; &nbsp; &nbsp; new Test();&nbsp; &nbsp; }&nbsp; &nbsp; public Test() {&nbsp; &nbsp; &nbsp; &nbsp; EventQueue.invokeLater(new Runnable() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; public void run() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; JFrame frame = new JFrame();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; frame.add(new TestPane());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; frame.pack();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; frame.setLocationRelativeTo(null);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; frame.setVisible(true);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; });&nbsp; &nbsp; }&nbsp; &nbsp; public class TestPane extends JPanel {&nbsp; &nbsp; &nbsp; &nbsp; private List<Rectangle> boxes;&nbsp; &nbsp; &nbsp; &nbsp; private Map<Rectangle, Point> vectors;&nbsp; &nbsp; &nbsp; &nbsp; public TestPane() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; boxes = new ArrayList<>(25);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; vectors = new HashMap<>(25);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Random random = new Random();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (int index = 0; index < 10; index++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int x = random.nextInt(400 - 10);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int y = random.nextInt(400 - 10);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Rectangle box = new Rectangle(x, y, 10, 10);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; boxes.add(box);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int xDelta = random.nextBoolean() ? 1 : -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int yDelta = random.nextBoolean() ? 1 : -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; vectors.put(box, new Point(xDelta, yDelta));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Timer timer = new Timer(40, new ActionListener() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; public void actionPerformed(ActionEvent e) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (Rectangle box : boxes) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Point delta = vectors.get(box);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (delta == null) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int xDelta = random.nextBoolean() ? 1 : -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int yDelta = random.nextBoolean() ? 1 : -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; delta = new Point(xDelta, yDelta);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int x = box.x + delta.x;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int y = box.y + delta.y;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (x < 0) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = 0;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; delta.x *= -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } else if (x + box.width > getWidth()) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = getWidth() - box.width;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; delta.x *= -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (y < 0) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = 0;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; delta.y *= -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } else if (y + box.height > getHeight()) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = getHeight() - box.height;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; delta.y *= -1;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; box.setLocation(x, y);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; vectors.put(box, delta);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; repaint();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; });&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; timer.start();&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; public Dimension getPreferredSize() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return new Dimension(400, 200);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; protected Shape getTextShape() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Graphics2D g2d = (Graphics2D) getGraphics();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (g2d == null) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return null;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Font font = new Font("Arial", Font.BOLD, 48);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.setFont(font);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; FontRenderContext frc = g2d.getFontRenderContext();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; GlyphVector gv = font.createGlyphVector(frc, "Cats with hats");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Rectangle2D box = gv.getVisualBounds();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Calclate the location of the text and offset the glyph shape...&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; float x = (float) (getWidth() - box.getWidth()) / 2f;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; float y = (float) (((getHeight() - box.getHeight()) / 2f) + (-box.getY()));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return gv.getOutline(x, y);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; protected void paintComponent(Graphics g) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; super.paintComponent(g);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Graphics2D g2d = (Graphics2D) g.create();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Shape shape = getTextShape();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.setColor(Color.BLACK);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.fill(shape);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.setColor(Color.RED);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.draw(shape);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (Rectangle box : boxes) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.setColor(Color.BLACK);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (shape.intersects(box)) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.setColor(Color.RED);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; g2d.draw(box);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}