You can use Canvas.drawArc, but you must compute the arguments it needs: Lets say that the center of the circle is (x0, y0) and that the arc contains your two points (x1, y1) and (x2, y2). Then the radius is: r=sqrt((x1-x0)(x1-x0) + (y1-y0)(y1-y0)). So: int r = (int)Math.sqrt((x1-x0)*(x1-x0) + (y1-y0)*(y1-y0)); int x = x0-r; int … Read more
Check: The angle from the centerX,centerY through X,Y should be between start&endangle. The distance from centerX,centerY to X,Y should be less then the Radius And you’ll have your answer.
You can do this: Paint paint = new Paint(); final RectF rect = new RectF(); //Example values rect.set(mWidth/2- mRadius, mHeight/2 – mRadius, mWidth/2 + mRadius, mHeight/2 + mRadius); paint.setColor(Color.GREEN); paint.setStrokeWidth(20); paint.setAntiAlias(true); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStyle(Paint.Style.STROKE); canvas.drawArc(rect, -90, 360, false, paint); The key is in paint.setStyle(Paint.Style.STROKE);, it crops the arc’s center with the stroke that you define in … Read more
The critical thing about Arc2D is the bounding rectangle. To make the half-arc H units high, the bounds must be 2 * H units high. AFAIK, PolarPlot does not support annotations. import java.awt.BasicStroke; import java.awt.Color; import java.awt.geom.Arc2D; import java.util.Random; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartFrame; import org.jfree.chart.JFreeChart; import org.jfree.chart.annotations.XYLineAnnotation; import org.jfree.chart.annotations.XYShapeAnnotation; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.data.xy.XYDataset; … Read more
I know it’s a bit late in the game, but I remembered this question from when it was new and I had a similar dillemma, and I accidently found the “right” solution, if anyone is still looking for one: <path d=” M cx cy m -r, 0 a r,r 0 1,0 (r * 2),0 a … Read more