用Java遞歸繪制圖形

Question

對於這個程序，我需要遞歸繪制一個'寶塔'，這是一系列漸弱的矩形，在中央對齊，堆疊在一起。 我想我已經得到了實際數字背后的邏輯，但是我無法弄清楚如何將圖形繪制為帶有Graphics2D的矩形。 我試圖把它變成一個基本的形狀繪圖程序，但卻無法找到如何將它遞歸到它中。

這是我在這一點上編寫的代碼，沒有考慮圖形：

import java.awt.Rectangle;


public class PagodaDrawer
{

private int initialY; //Top of the bottom rectangle
private int initialHeight; //Height for the bottom rectangle
private double scale; //Amount to reduce each layer


public PagodaDrawer(int initialY, int initialHeight, double scaleFactor)
{
    this.initialY = initialY;
    this.initialHeight = initialHeight;
    scale = scaleFactor;
}

public void drawPagoda()
{
    drawLayer(0, initialY, 2 * initialHeight, initialHeight);
}

public void drawLayer(double x, double y, double width, double height)
{
    if(y < 0 || height < 5) //If off the top of the screen, or less than 5 tall
    {
        return;
    }
    drawLayer(x - (((1 - scale)* x) / 2), y + (y * scale), width * scale, height * scale );
    Rectangle r = new Rectangle((int)x, (int)y, (int)(2 * height), (int)height);
    //Draw r?
}
}

如何在框架中遞歸繪制圖形的圖層？

編輯：

對於任何感興趣的人，這是最終的代碼

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class PagodaDrawer extends JPanel
{
private int initialX;
private int initialY; //Top of the bottom rectangle
private int initialHeight; //Height for the bottom rectangle
private double scale; //Amount to reduce each layer
private boolean isRenderable;
private ArrayList<Rectangle> recs;


public PagodaDrawer(int initialX, int initialY, int initialHeight, double scaleFactor)
{
    this.initialX = initialX;
    this.initialY = initialY;
    this.initialHeight = initialHeight;
    scale = scaleFactor;
    isRenderable = false;
    recs = new ArrayList<Rectangle>();
}

public void drawPagoda()
{
    drawLayer(initialX, initialY, 2 * initialHeight, initialHeight);
}

public void drawLayer(double x, double y, double width, double height)
{
    if(y < 0 || height < 5) //If off the top of the screen, or less than 5 tall
    {
        isRenderable = true;
        return;
    }
    drawLayer(x + .5 * (width - (width * scale)), y - (height * scale), width * scale, height * scale );
    Rectangle r = new Rectangle((int)x, (int)y, (int)(2 * height), (int)height);
    recs.add(r);
}

public void paintComponent(Graphics g)
{
    if(!isRenderable)
        return;
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    for(int i = 0; i < recs.size(); i++)
    {
        g2.draw(recs.get(i));
        System.out.println(recs.get(i));
    }
}
}

再加上這個JFrame：

import javax.swing.JFrame;
import javax.swing.JPanel;



public class DisplayComponent extends JFrame
{
private static final long serialVersionUID = -4279682826771265863L;
private static final int FRAME_WIDTH = 500;
private static final int FRAME_HEIGHT = 500;

private JPanel panel;
private PagodaDrawer p;

public DisplayComponent(int initialHeight, double scaleFactor)
{
    p = new PagodaDrawer(FRAME_WIDTH / 2, FRAME_HEIGHT, initialHeight, scaleFactor);
    panel = new JPanel();
    p.drawPagoda();
    add(p);

    pack();



    setSize(FRAME_WIDTH, FRAME_HEIGHT);
    setVisible(true);
}
}

Answer 1

而不是使drawLayer()遞歸，編寫一個遞歸的createRectangle() ，將每個新的Rectangle實例添加到List<Rectangle> 。 渲染在執行列表中paintComponent()說明在這里 。

Answer 2

在Java AWT和Swing中，您使用Graphics / Graphics2D方法繪制。
示例： graphics.fillRect(x, y, w, h);

您應該從要繪制的組件中獲取graphics(?:2d)對象，通常是主框架或某個組件。

在框架的paintComponent()中調用繪圖應該像這樣工作：

如何在Java中使用paintComponent來繪制多個東西，但是旋轉一個？

這是Java6文檔： http ： //docs.oracle.com/javase/6/docs/api/