[英]Nested loops when using draw methods, having trouble figuring out how to set it up right
我需要幫助弄清楚如何使用Java中的draw方法在嵌套的for循環中繪制棋盤格/被子狀圖案。 我的實驗室作業內容如下。 您必須創建QuiltPattern類並聲明該類的兩個對象。 此類的構造函數將接受一個參數,該參數設置對象的特征(如顏色),在繪制被子時替換這些對象。 確保您的被子至少橫過5塊,向下7塊。 您的QuiltPattern類應包含一個稱為Draw()的方法,該方法可在屏幕上的特定位置繪制圖案。 您必須使用嵌套循環來繪制被子。 我幾乎所有東西都寫完了,但是我很難畫出像被子/棋盤一樣的物體。 我似乎無法使其對齊,到目前為止,我只有兩行是偏移量。 任何幫助或建議,以使其在嵌套循環中工作,將不勝感激。 我一直在嘗試找到與此類似的東西,但我運氣並不好。 我究竟做錯了什么?
這是我的QuiltPanel:
import javax.swing.*;
import java.awt.*;
public class QuiltPanel extends JPanel
{
int x = 0, y = 0, count = 0;
private Quilt squareOne, squareTwo;
public QuiltPanel()
{
squareOne = new Quilt(25, Color.blue, x+50, y);
squareTwo = new Quilt(25, Color.green, x+25, y);
setPreferredSize(new Dimension(750, 500));
setBackground(Color.black);
}
public void paintComponent(Graphics page)
{
super.paintComponent(page);
for ( count = 0; count <= 10; count = count+1)
{ if ( count % 2 == 0)
{ if ( count <= 5)
{ squareOne.draw(page);
squareOne = new Quilt(25, Color.blue, x, y);
}
else
{ squareOne.draw(page);
squareOne = new Quilt(25, Color.blue, x, y+25);
}
}
else
{ if ( count <= 5)
{ squareTwo.draw(page);
squareTwo = new Quilt(25, Color.green, x, y);
}
else
{ squareTwo.draw(page);
squareTwo = new Quilt(25, Color.green, x, y+25);
}
}
x=x+25;
}
}
}
這是我的被子課:
import java.awt.*;
public class Quilt
{
private int height, width, x, y;
private Color color;
public Quilt(int size, Color newColor, int upperX, int upperY)
{
width = size;
height = size;
color = newColor;
x = upperX;
y = upperY;
}
public void draw(Graphics page)
{
page.setColor(color);
page.fillRect(x, y, width, height);
}
public void setHeight(int size)
{
height = size;
}
public void setWidth(int size)
{
width = size;
}
public void setColor(Color newColor)
{
color = newColor;
}
public void setX(int upperX)
{
x = upperX;
}
public void setY(int upperY)
{
y = upperY;
}
public int getHeight()
{
return height;
}
public int getWidth()
{
return width;
}
public Color getColor()
{
return color;
}
public int getX()
{
return x;
}
public int getY()
{
return y;
}
}
如果您需要我的QuiltPattern(JFrame):
import javax.swing.*;
import java.awt.*;
public class QuiltPattern
{
public static void main(String[] args)
{
JFrame frame = new JFrame("QuiltPattern");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new QuiltPanel());
frame.getContentPane().add(new QuiltPanel());
frame.pack();
frame.setVisible(true);
}
}
您的被子類應該是QuiltPattern類。 因此,我只是將代碼從Quilt復制並粘貼到QuiltPattern,正如程序中所說的那樣,QuiltPattern將執行繪圖,並且它將具有2個具有不同繪圖屬性的對象。
最好總是分開Main類。 我創建了一個新類QuiltMain來初始化框架和面板。 (這是您的全部代碼)。
更改了QuiltPattern的構造函數(以前稱為Quilt),使其接受2個參數的顏色和大小,因為在邏輯上應將正方形的位置傳遞給draw()方法本身。
最后是創建棋盤格圖案的循環。 通常有3個選項。
選項1。
int initX = getWidth() / 2 - (columnCount * squareSide) / 2;
int initY = getHeight() / 2 - (rowCount * squareSide) / 2;
int squareCount = rowCount * columnCount;
for(int i = 0; i < squareCount; i++) {
int rowI = squareCount / rowCount;
int colJ = squareCount % columnCount;
//draw at (initX + colJ * squareSide, initY + colI * squareSide)
}
選項2。
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
for(int colJ = -rowCount/2; colJ < rowCount/2; colJ++) { //condition will include <= when rowCount is odd
for(int rowI = -columnCount/2; rowI < columnCount/2; rowI++) {//condition will include <= when columnCount is odd
//draw at (centerX + colJ * squareSide, centerY + colI * squareSide)
}
選項3:
int initX = getWidth() / 2 - (columnCount * squareSide) / 2;
int initY = getHeight() / 2 - (rowCount * squareSide) / 2;
for(int colJ = 0; colJ < rowCount; colJ++) {
for(int rowI = 0; rowI < columnCount; rowI++) {
//draw at (initX + colJ * squareSide, initY + colI * squareSide)
}
我選擇了選項3,因為它似乎最簡單,最合適。
工作代碼:
QuiltMain
import javax.swing.JFrame;
public class QuiltMain {
public static void main(String[] args) {
JFrame frame = new JFrame("QuiltPattern");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new QuiltPanel());
frame.getContentPane().add(new QuiltPanel());
frame.pack();
frame.setVisible(true);
}
}
QuiltPattern
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class QuiltPattern {
private int height, width, x, y;
private Color color;
public QuiltPattern(int size, Color newColor) {
width = size;
height = size;
color = newColor;
}
public void draw(Graphics page, int x, int y) {
page.setColor(color);
page.fillRect(x, y, width, height);
}
public void setHeight(int size) {
height = size;
}
public void setWidth(int size) {
width = size;
}
public void setColor(Color newColor) {
color = newColor;
}
public void setX(int upperX) {
x = upperX;
}
public void setY(int upperY) {
y = upperY;
}
public int getHeight() {
return height;
}
public int getWidth() {
return width;
}
public Color getColor() {
return color;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
}
QuiltPanel
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JPanel;
class QuiltPanel extends JPanel {
int x = 0, y = 0;
int rowCount = 7;
int columnCount = 5;
private QuiltPattern squareOne, squareTwo;
public QuiltPanel() {
squareOne = new QuiltPattern(25, Color.blue);
squareTwo = new QuiltPattern(25, Color.green);
setPreferredSize(new Dimension(750, 500));
setBackground(Color.black);
}
public void paintComponent(Graphics page) {
super.paintComponent(page);
int count = 0;
int squareSide = squareOne.getWidth();
boolean firstOne = true;
int quiltWidth = columnCount * squareSide;
int quiltHeight = rowCount * squareSide;
int initX = (getWidth() - quiltWidth) / 2;
int initY = (getHeight() - quiltHeight) / 2;
for(int colJ = 0; colJ < columnCount; colJ++) {
for(int rowI = 0; rowI < rowCount; rowI++) {
int x = colJ * squareSide + initX;
int y = rowI * squareSide + initY;
if(firstOne) {
squareOne.draw(page, x, y);
} else {
squareTwo.draw(page, x, y);
}
firstOne = !firstOne;
}
}
}
}
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