蝕刻處理中的素描程序（java）（新程序員）

我無法弄清楚如何讓我的代碼創建一個連續的線條而不是一串點。第一個問題是，我的線功能（POSX，波西，POSX，波西），這是產生點，但我不知道如何去改變它，這樣它絡繹不絕蝕刻處理中的素描程序（java）（新程序員）

float posX; //current mouseX position 
float posY; // current mouseY position 
float ballSpeed = 50f; //controls speed that the stylus moves 
final float OFF_SET = 250f; // allows ball to stay still if mouse is in center of window 
void setup() 
{  
    size(500, 500); 
    posX= width/2; // next four lines of code make the stylus start in middle 
    posY=width/2; 

    background(255); //clears background once 
} 
void draw() 
{ 

    drawLine(); //calls the drawLine function 
    moveStylus(); //calls the moveStylus function 
} 

void drawLine() 
{ 
    line(posX, posY, posX, posY); //draws a line starting previous to relative mouse position and ending at to current to relative mouse position 
} 
void moveStylus() 
{ 
    float moveX; 
    float moveY; 
    moveX = (mouseX-OFF_SET)/ballSpeed; 
    moveY = (mouseY-OFF_SET)/ballSpeed; 
    posX+= moveX; 
    posY+= moveY; 
    posX= max(width+1-width, posX); // line will never leave right side of screen 
    posX = min(width-1, posX); //line will never leave left side of screen 
    posY= max(height+1-height, posY); //line will never leave bottom of screen 
    posY = min(width-1, posY); // line will never leave top of screen 
}

來源

2017-02-13 thebigrhombus

line（posX，posY，posX，posY）的調用令人擔憂。這是否意味着「從（posX，posY）開始並在（posX，posY）結束」畫一條線？最後兩個參數可能應該與前兩個不同。 –