Graph Axis問題

我使用一個線程的輸出創建線圖，這些線程模擬了運行了52秒的輸入和輸出賬單，並且這將在線圖上顯示，如下所示，以顯示銀行平衡超過52秒！Graph Axis問題

問題是我似乎無法正確計算Y軸。下面顯示輸出的代碼在軸的頂部右手側的紅色標記，但它不會

enter image description here

public void paintComponent(Graphics g) { 

    int y = 10000; // balance 
    int x = 52 ; // weeks 
    int prevX, prevY; 
    int maxX = 52; 
    int maxY = 10000; 

    int Xleft = 200; 
    int Xright = 900; 
    int Ytop = 50; 
    int Ybottom = 330;// defining axis 

    Graphics2D g2 = (Graphics2D) g; 
    super.paintComponent(g2); 
    g2.setColor(Color.BLUE); 

    BasicStroke pen = new BasicStroke(4F); 
    g2.setStroke(pen); 

    g2.drawLine(Xleft,Ytop,Xleft,Ybottom); 
    g2.drawLine(Xleft,280,Xright,280); 

    Font f = new Font("Serif", Font.BOLD, 14); 
    g2.setFont(f); 
    g2.drawString("Account Balance (£)", 35, 200); 
    g2.drawString("Elapsed Time (Weeks)", 475, 340); 



//retrieve values from your model for the declared variables  

//calculate the coords line on the canvas 

double balance = (((double)y/maxY) * Y_AXIS_LENGTH) - Y_AXIS_OFFSET; //floating point arithmetic 
double weeks = (((double)x/maxX) * X_AXIS_LENGTH) + X_AXIS_OFFSET; 

int xPos = (int) Math.round (weeks); 
int yPos = (int)Math.round(balance); // changing back to int to be used in drawing oval 

g2.setColor(Color.RED); 
g.drawOval(xPos, yPos, 2, 2); 
System.out.println(xPos + " " + yPos); 

}

來源

2012-03-02 Chris Mowbray

不應該這樣：

double balance = (((double)y/maxY) * Y_AXIS_LENGTH) - Y_AXIS_OFFSET;

是本？

double balance = Y_AXIS_OFFSET - (((double)y/maxY) * Y_AXIS_LENGTH);

來源

2012-03-02 01:14:39

沒有這個給出和輸出的-145，任何減號將離開面板。 – 2012-03-02 10:29:53

我似乎已經明白了，答案是..... double balance = 365 - （（（（double）y/maxY）* Y_AXIS_LENGTH）+ Y_AXIS_OFFSET）; ..... 365是整個長度面板 – 2012-03-02 11:20:50

這聽起來像'Y_AXIS_OFFSET'被定義不正確。它需要是面板頂部和圖形原點之間的區別。如果你設置了這個權利，那麼@Hovercraft_Full_Of_Eels的更正就是你需要的。 – MattLBeck 2012-03-02 12:04:53

回答

相關問題