?? database.java
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import java.awt.*;class Database { final int maxnp = 1024; final int PtSize = 5; int[] x = new int[maxnp]; int[] y = new int[maxnp]; int np; int xsiz, ysiz; Color col; boolean lockflag = false; public Database(int xSize, int ySize, Color Col) { xsiz = xSize; ysiz = ySize; col = Col; np = 0; } public void paint(Graphics g) { g.setColor(col); for(int i = 0; i < np; i++) { g.fillRect(x[i]-PtSize/2,y[i]-PtSize/2,PtSize,PtSize); } } public void push(int newx, int newy) { if(np < maxnp) { x[np] = newx; y[np] = newy; np++; } } public void clearPoints() { np = 0; } public void randomPoints(int n) { for(int i = 0; i < n; i++) push((int) (xsiz * Math.random()), (int) (ysiz * Math.random())); } public void circlePoints(int n) { int x,y; double alpha,range; for(int i = 0; i < n; i++) { alpha = Math.random()*2*Math.PI; range = 0.6 + Math.random()*0.4; x = (int)(range*Math.cos(alpha)*xsiz/2)+xsiz/2; y = (int)(range*Math.sin(alpha)*ysiz/2)+ysiz/2; push(x,y); } } public int nPoints() { return np; } public int xVal(int i) { return x[i]; } public int yVal(int i) { return y[i]; }}?? 快捷鍵說明
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