用Java绘制头部和颈部。拉绳问题
在Person类中：
public Point[] endPointArray;
private int scalar;
private Head head;
private Neck neck;
public Person(){
scalar = 1;
endPointArray = new Point[100];
for ( int i = 0 ; i < 100 ; i++ ){
endPointArray[i] = new Point();
}
positionArray = new int[4];
point = new Point(0,0);
endPointArray[0].x = 5;
endPointArray[0].y = 5;
head = new Head(neck, endPointArray, scalar);
neck = new Neck(body, endPointArray, scalar);
}
public void draw(Graphics g){
head.draw(g);
neck.draw(g);
}
在头等舱内：
// ---------- CONSTANTS. ----------
private static int Base_Radius = 20;
// ---------- VARIABLE DECLARATIONS. ----------
private int radius;
private int scale; // Scale determines how large the Head will be.
private Point startingPoint; //Starting Point for the Person and the Head.
private Point endingPoint; //Ending Point, where the Neck will start from.
private Point[] endPointArray; // Contains startingPoint in position [0] by this point from Person.
private Point centre;
private Neck neck;
// ----------------------------------------
// HEAD CREATION.
// ----------------------------------------
public Head(Neck neck, Point[] endPointArray, int scale){
this.neck = neck;
this.endPointArray = endPointArray;
this.scale = scale;
radius = Base_Radius * scale;
startingPoint = new Point();
endingPoint = new Point();
centre = new Point();
// Copies the value of endPointArray[0] into startingPoint.
startingPoint.x = endPointArray[0].x;
startingPoint.y = endPointArray[0].y;
// Picks the point on the Head where the Neck will start from.
endingPoint.x = startingPoint.x + radius;
endingPoint.y = startingPoint.y + ( 2*radius );
// Assigns the value of the circles centre to the centre point.
centre.x = startingPoint.x + radius;
centre.y = startingPoint.y + radius;
// Puts the value of the endingPoint into the endPointArray[1].
endPointArray[1].x = endingPoint.x;
endPointArray[1].y = endingPoint.y;
}
// ----------------------------------------
// DRAW THE HEAD.
// ----------------------------------------
public void draw(Graphics g){
g.drawOval(startingPoint.x, startingPoint.y, radius, radius);
System.out.println("Radius : " + radius);
System.out.println("Head Starting Point : ("+startingPoint.x+","+startingPoint.y+").");
System.out.println("Head Ending Point : ("+endingPoint.x+","+endingPoint.y+").\n");
}
颈部类内：
// ---------- CONSTANTS. ----------
private static int Base_Length = 10;
// ---------- VARIABLE DECLARATIONS. ----------
private int length;
private int scale; // Scale determines how large the Head will be.
private Point anglePoint;
private Point startingPoint; //Starting Point for the Person and the Head.
private Point endingPoint; //Ending Point, where the Neck will start from.
private Point[] endPointArray; // Contains startingPoint in position [0] by this point from Person.
private Body body;
// ----------------------------------------
// NECK CREATION.
// ----------------------------------------
public Neck(Body body, Point[] endPointArray, int scale){
this.endPointArray = endPointArray;
this.body = body;
this.scale = scale;
length = Base_Length * scale;
startingPoint = new Point();
endingPoint = new Point();
anglePoint = new Point();
// Making the startingPoint equal to the endPointArray[1].
startingPoint.x = endPointArray[1].x;
startingPoint.y = endPointArray[1].y;
// Seting the values of the point where the neck finishes.
endingPoint.x = startingPoint.x;
endingPoint.y = startingPoint.y + length;
}
// ----------------------------------------
// DRAW THE HEAD.
// ----------------------------------------
public void draw(Graphics g){
g.drawLine(startingPoint.x, startingPoint.y, endingPoint.x, endingPoint.y);
System.out.println("Neck Starting Point : ("+startingPoint.x+","+startingPoint.y+").");
System.out.println("Neck Ending Point : ("+endingPoint.x+","+endingPoint.y+").");
}
输出：
半径：20
头部起点：（5,5）
头部终点：（25,45）
颈部起点：（25,45）
颈部终点：（25,55）
头部在面板中以5,5绘制，似乎具有正确的半径。颈部漂浮在远离头部的地方。输出看起来是正确的，但从视觉上看是不正确的。颈部应该是一条水平线，从头部底部向下，我不知道为什么它的行为不符合我的预期。 如果这是一个新手问题，我很抱歉，但我现在被卡住了
# 1 楼答案
问题是drawOval将宽度和高度作为参数，但您要通过的是半径。您需要使用：
From the API：