我正在尝试制作一个带有饼形片的色轮,其中每个饼都是一个按钮。这是两个切片的代码。目前,第二切片覆盖具有白色背景的第一切片。我的目标可能吗?
ShapeDrawable slice1 = new ShapeDrawable(new ArcShape(0, 30));
slice1.setIntrinsicHeight(100);
slice1.setIntrinsicWidth(100);
slice1.getPaint().setColor(Color.MAGENTA);
View slice1View = (View) findViewById(R.id.slice1);
slice1View.setBackgroundDrawable(slice1);
slice1View.setOnClickListener(magentaButtonListener);
ShapeDrawable slice2 = new ShapeDrawable(new ArcShape(30, 60));
slice2.setIntrinsicHeight(100);
slice2.setIntrinsicWidth(100);
slice2.getPaint().setColor(Color.BLUE);
View slice2View = (View) findViewById(R.id.slice2);
slice1View.setBackgroundDrawable(slice2);
slice1View.setOnClickListener(blueButtonListener);
布局代码是:
<FrameLayout
android:layout_width="100dp"
android:layout_height="100dp"
android:id="@+id/pie" >
<View
android:id="@+id/slice1"
android:layout_width="40dp"
android:layout_height="40dp"/>
<View
android:id="@+id/slice2"
android:layout_width="40dp"
android:layout_height="40dp"/>
</FrameLayout>
修改!解决方案: 我将x和y坐标设置为圆的直径的一半。然后:我使用getAngle方法计算角度,这将决定点击的颜色。
//from StackOverflow post by Dave Discoid, at http://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points
public double getAngle(float x, float y )
{
double dx = x - DIAMETER/2;
// Minus to correct for coord re-mapping
double dy = -(y - DIAMETER/2);
double inRads = Math.atan2(dy,dx);
// We need to map to coord system when 0 degree is at 3 O'clock, 270 at 12 O'clock
if (inRads < 0)
inRads = Math.abs(inRads);
else
inRads = 2*Math.PI - inRads;
return Math.toDegrees(inRads);
}