绘制饼图中的Android? [英] Draw Pie Chart in Android?
本文介绍了绘制饼图中的Android?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要绘制饼图(动态值)。如何创建图表,而无需使用第三方API。
I need to draw Pie Chart (Dynamic Values).How to create the Chart without using 3rd party API.
推荐答案
下面显示了简单的饼图,你必须扩展更多的功能...值[]和颜色排列应该是平等的......
Below shows simple pie-chart and you have to extend for more features...values[] and colors array should be equal....
public class Demo extends Activity {
/** Called when the activity is first created. */
float values[]={300,400,100,500};
@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];
for(int i=0;i<values.length;i++)
{
value_degree[i]=values[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);
}
}
}
}
}
这篇关于绘制饼图中的Android?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文