在Android绘图中更改正弦波宽度
我正在使用android plot绘制我的动态日期。谁能告诉我怎样才能改变现状 下图中正弦波的宽度 我正在使用一个示例代码 下面的代码是我的活动在Android绘图中更改正弦波宽度,android,graph,androidplot,android-graphview,Android,Graph,Androidplot,Android Graphview,我正在使用android plot绘制我的动态日期。谁能告诉我怎样才能改变现状 下图中正弦波的宽度 我正在使用一个示例代码 下面的代码是我的活动 public class MyActivity extends Activity { // redraws a plot whenever an update is received: private class MyPlotUpdater implements Observer { Plot plot; public MyPlot
public class MyActivity extends Activity {
// redraws a plot whenever an update is received:
private class MyPlotUpdater implements Observer {
Plot plot;
public MyPlotUpdater(Plot plot) {
this.plot = plot;
}
@Override
public void update(Observable o, Object arg) {
try {
plot.postRedraw();
} catch (InterruptedException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
}
private XYPlot dynamicPlot;
private XYPlot staticPlot;
private MyPlotUpdater plotUpdater;
@Override
public void onCreate(Bundle savedInstanceState) {
// android boilerplate stuff
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// get handles to our View defined in layout.xml:
dynamicPlot = (XYPlot) findViewById(R.id.dynamicPlot);
plotUpdater = new MyPlotUpdater(dynamicPlot);
// only display whole numbers in domain labels
dynamicPlot.getGraphWidget().setDomainValueFormat(new DecimalFormat("0"));
// getInstance and position datasets:
SampleDynamicXYDatasource data = new SampleDynamicXYDatasource();
SampleDynamicSeries sine1Series = new SampleDynamicSeries(data, 0, "Sine 1");
SampleDynamicSeries sine2Series = new SampleDynamicSeries(data, 1, "Sine 2");
dynamicPlot.addSeries(sine1Series, new LineAndPointFormatter(Color.rgb(0, 0, 0), null, Color.rgb(0, 80, 0)));
// create a series using a formatter with some transparency applied:
LineAndPointFormatter f1 = new LineAndPointFormatter(Color.rgb(0, 0, 200), null, Color.rgb(0, 0, 80));
f1.getFillPaint().setAlpha(220);
dynamicPlot.addSeries(sine2Series, f1);
dynamicPlot.setGridPadding(5, 0, 5, 0);
// hook up the plotUpdater to the data model:
data.addObserver(plotUpdater);
dynamicPlot.setDomainStepMode(XYStepMode.SUBDIVIDE);
dynamicPlot.setDomainStepValue(sine1Series.size());
// thin out domain/range tick labels so they dont overlap each other:
dynamicPlot.setTicksPerDomainLabel(5);
dynamicPlot.setTicksPerRangeLabel(3);
dynamicPlot.disableAllMarkup();
// freeze the range boundaries:
dynamicPlot.setRangeBoundaries(-100, 100, BoundaryMode.FIXED);
// kick off the data generating thread:
new Thread(data).start();
}
}在文件
SampleDynamicXYDatasource.java
中可以找到该行
double amp = sinAmp * Math.sin(index + phase + 4);
在那里产生正弦波。通过延迟索引(例如,将其乘以0.5),您可以使正弦波的周期变大,或者在图形中,在x轴上缩放它。请向我们展示一些代码,理想情况下是为给定的x值计算Y值的代码。已经给出了问题中使用的教程。嗯,这取决于你让读者帮助你有多容易或有多困难,以及你会得到什么样的回应。目前,为了帮助您,您必须仔细阅读完整的教程,才能找到正确的代码。@DanielS。在上面添加了代码。