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我的自定义画布延伸帆布,并覆盖paint()方法,如下为什么会出现短线段而不是全线图?
@Override
public void paint(Graphics g) {
Rectangle bounds = getBounds();
g.translate(0, (bounds.y + bounds.height)/2);
int maxX = (int) bounds.getMaxX();
g.drawLine(currX, currY, currX + 5, m_nextY);
currX = currX > maxX ? maxX : currX + 5;
currY = m_nextY;
if (currX >= maxX) {
currX = 0;
}
}
int currX = 0;
int currY = 0;
int m_nextY;
public void setNextY(int pNext) {
m_nextY = pNext;
}
该程序入口点运行一个循环,以提取被缩放的随机数和设置位置的Y坐标这样
java.util.Random engine = new Random();
while (Thread.currentThread().isAlive()) {
myCanvas.setNextY((int) (engine.nextFloat() * -15f));
myCanvas.paint(getGraphics());
try {
Thread.sleep(300);
} catch (InterruptedException ex) {
// Balderdash!
}
}
这里预期的输出应该是一个折线图。相反,只有一个短小的细分市场和姿态各异。
我在这里做错了什么?
engine是java.util.Random的一个实例 – Everyone 2012-01-16 17:56:34