私の見解では、これを実行する最良の方法は、カメの位置(XとY)、double
変数を使用した方向を追跡し、基本的な三角法を使用して、カメが当たる次の「ピクセル」を計算することです。タイマーまたはループを使用してこのコードを実行すると想定しているため、次のようになります。
//This code is somehwere in your program
class Turtle
{
private double x;
private double y;
private double direction; //direction in radians
public double getX() {
return x;
}
public void setX(double x) {
this.x = x;
}
public double getY() {
return y;
}
public void setY(double y) {
this.y = y;
}
public double getDirection() {
return direction;
}
public void setDirection(double direction) {
while(direction > Math.PI * 2)
{
direction -= Math.PI * 2;
}
while(direction < 0)
{
direction += Math.PI * 2;
}
this.direction = direction;
}
}
private static final int GRID_WIDTH = 400;
private static final int GRID_HEIGHT = 400;
private Turtle myTurtle = new Turtle();
private boolean[][] grid = new boolean[GRID_WIDTH][GRID_HEIGHT];
JFrame myJFrame = new JFrame();
private Graphics gridImage = myJFrame.getGraphics();
private void initialise()
{
for(int y = 0; y < GRID_HEIGHT; y++)
{
for(int x = 0; x < GRID_WIDTH; x++)
{
grid[x][y] = false;
}
}
gridImage.setColor(Color.BLACK);
gridImage.fillRect(0, 0, GRID_WIDTH, GRID_HEIGHT);
gridImage.setColor(Color.white);
}
//This code would be inside the loop or timer callback function
private void myMainFunction()
{
double newX, newY;
double deltaX, deltaY;
deltaX = Math.cos(myTurtle.getDirection());
deltaY = Math.sin(myTurtle.getDirection());
newX = myTurtle.getX() + deltaX;
newY = myTurtle.getY() + deltaY;
if(newX < 0)
{
newX += GRID_WIDTH;
}
else if(newX > GRID_WIDTH)
{
newX -= GRID_WIDTH;
}
if(newY < 0)
{
newY += GRID_HEIGHT;
}
else if(newY > GRID_HEIGHT)
{
newY -= GRID_HEIGHT;
}
grid[(int)Math.floor(newX)][(int)Math.floor(newY)] = true;
gridImage.fillRect((int)Math.floor(newX), (int)Math.floor(newY), 1, 1);
myJFrame.update(gridImage);
myTurtle.setX(newX);
myTurtle.setY(newY);
}