机器人:可点击饼图 [英] Android: Clickable piechart
问题描述
我需要一个饼图我的应用程序,以显示不同部分的一些数据。 在饼图准备,它也能正常工作,但我需要一个可点击的事件在饼图。请一个特定部分触摸时让我知道了code 提前致谢。 这是我的Android code
公共类PieActivity扩展活动
{
/ **第一次创建活动时调用。 * /
浮点值[] = {300700100500};
@覆盖
公共无效的onCreate(包savedInstanceState)
{
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
的LinearLayout线性=(的LinearLayout)findViewById(R.id.linear);
值= calculateData(值);
linear.addView(新MyGraphview(这一点,值));
}
私人浮法[] calculateData(浮动[]数据)
{
// TODO自动生成方法存根
总浮= 0;
的for(int i = 0; I< data.length;我++)
{
共有+ =数据[I]
}
的for(int i = 0; I< data.length;我++)
{
数据[i] = 360 *(数据[I] /个);
}
返回的数据;
}
公共类MyGraphview扩展视图
{
民营涂料粉刷=新的油漆(Paint.ANTI_ALIAS_FLAG);
私人浮法[] value_degree;
私人INT [] COLORS = {Color.BLUE,Color.GREEN,Color.GRAY,Color.CYAN,Color.RED};
RectF rectf =新RectF(10,10,200,200);
INT TEMP = 0;
公共MyGraphview(上下文的背景下,浮法[]值){
超(上下文);
value_degree =新的浮动[values.length]
//的System.out.println(值+ value_degree);
的for(int i = 0; I< values.length;我++)
{
value_degree [I] =值[I];
的System.out.println(度+ value_degree [I]);
}
}
@覆盖
保护无效的OnDraw(帆布油画){
// TODO自动生成方法存根
super.onDraw(画布);
的for(int i = 0; I< value_degree.length;我++){//values2.length;我++){
如果(我== 0){
paint.setColor(COLORS [I]);
canvas.drawArc(rectf,0,value_degree [I],真,油漆);
}
其他
{
温度+ =(int)的value_degree [我 - 1];
paint.setColor(COLORS [I]);
canvas.drawArc(rectf,温度,value_degree [I],真实,油漆);
}
}
}
}
}
您可以试试这个:
-
覆盖的onTouchEvent在MyGraphView并检查行动。通常情况下为ACTION_DOWN您应该返回true和ACTION_UP处理click。
-
在你处理一下,提取从图表中心的相关事件的坐标,像
浮动RELX = event.getX() - (rectf.right - rectf.left)* 0.5F; 浮依靠= event.getY() - (rectf.bottom - rectf.top)* 0.5F;
-
然后,你需要找到的角度:
浮动angleInRad =(浮点)Math.atan2(靠,RELX);
-
现在你已经得到了角度,但弧度和范围-PI..PI。所以:
INT度=(INT)((angleInRad + Math.PI)* 180 / Math.PI);
-
现在只要找到它的时间间隔(从value_degree)包含此值。
还要注意,由于该坐标系是上下颠倒,你可能需要使用-relY,而不是依赖。试试吧,如果需要改变它。
I need a piechart for my App to display some data in different sections. the piechart is ready and it also works fine but i need a clickable event when touched on a particular section in pie chart .Please let me know the code Thanks in advance. this is my android code
public class PieActivity extends Activity
{
/** Called when the activity is first created. */
float values[]={300,700,100,500};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout linear=(LinearLayout) findViewById(R.id.linear);
values=calculateData(values);
linear.addView(new MyGraphview(this,values));
}
private float[] calculateData(float[] data)
{
// TODO Auto-generated method stub
float total=0;
for(int i=0;i<data.length;i++)
{
total+=data[i];
}
for(int i=0;i<data.length;i++)
{
data[i]=360*(data[i]/total);
}
return data;
}
public class MyGraphview extends View
{
private Paint paint=new Paint(Paint.ANTI_ALIAS_FLAG);
private float[] value_degree;
private int[] COLORS={Color.BLUE,Color.GREEN,Color.GRAY,Color.CYAN,Color.RED};
RectF rectf = new RectF (10, 10, 200, 200);
int temp=0;
public MyGraphview(Context context, float[] values) {
super(context);
value_degree=new float[values.length];
// System.out.println("values"+value_degree);
for(int i=0;i<values.length;i++)
{
value_degree[i]=values[i];
System.out.println("degree"+value_degree[i]);
}
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
for (int i = 0; i < value_degree.length; i++) {//values2.length; i++) {
if (i == 0) {
paint.setColor(COLORS[i]);
canvas.drawArc(rectf, 0, value_degree[i], true, paint);
}
else
{
temp += (int) value_degree[i - 1];
paint.setColor(COLORS[i]);
canvas.drawArc(rectf, temp, value_degree[i], true, paint);
}
}
}
}
}
You could try this:
Override onTouchEvent in MyGraphView and check the action. Normally for ACTION_DOWN you should return true and on ACTION_UP handle the click.
When you handle the click, extract the relative event coordinates from the center of the chart, something like
float relX = event.getX() - (rectf.right - rectf.left) * 0.5f; float relY = event.getY() - (rectf.bottom - rectf.top) * 0.5f;
Then you need to find the angle:
float angleInRad = (float)Math.atan2(relY, relX);
Now you've got the angle but in radians and in the range -PI..PI. So:
int degree = (int)((angleInRad + Math.PI) * 180 / Math.PI);
Now just find which interval (from value_degree) contains this value.
Also note that since the coordinate system is upside down, you might need to use -relY instead of relY. Just try it and change it if needed.
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