怎么才能让我画的图随着我按键盘上的上下键，上下移动啊。求解啊
int fishY =258;
int fishX =0;
void setup()
{
size(500,400);
background(29,177,180);
smooth();
}
void draw ()
{
fish();
}
void fish()
{
if(fishX<551)
{
noStroke();
fill(29,177,180);
rect(0,0,500,400);
stroke(240, 164, 0);
fill(247, 132, 90);
ellipse(fishX, fishY, 60, 45);
triangle(fishX - 28,fishY,fishX - 50,fishY-20, fishX - 50, fishY+20);
noStroke();
fill(0);
ellipse(fishX + 13,fishY-4,5,5);
line( fishX+5,fishY-8,fishX+12,fishY-19);
line(fishX+14,fishY+8,fishX+21,fishY+8);
fishX = fishX + 5;
frameRate(25);
}
}
void mousePressed ()
{
fishX=mouseX;
fishY=mouseY;
fish();
}

void keyPressed() {
if (key == CODED) {
if (keyCode == UP) {
fishY-=10;
} else if (keyCode == DOWN) {
fishY+=10;
}
}
}
你把这一段加在尾部就可以了