[mono-android] DrawLine problem with Paint.StrokeWidth = 1

[Narcís Calvet]

Hi Jon, 

-----Original Message-----
From: monodroid-bounces at lists.ximian.com
[mailto:monodroid-bounces at lists.ximian.com] On Behalf Of Jonathan Pryor
Sent: dimecres, 16 / març / 2011 16:49
To: monodroid at lists.ximian.com
Subject: Re: [mono-android] DrawLine problem with Paint.StrokeWidth = 1

>Could you provide a test case?

Yes, find it below. I just created a new MonoDroid application and added
code below. You'll see that only 2 red lines (StrokeWidth = 1) are painted
while all lime lines (StrokeWidth = 2) are painted.


>I don't know why this would fail, though I imagine that Mono isn't the
problem (porting the code to Java and seeing what Java does would narrow
this down).

A colleague did a similar test with Java for Android in Eclipse and worked
fine there.


using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Graphics;

namespace MonoDroidApplication1
{
  class MyControl : View
  {
    public MyControl(Context context)
      : base(context) { }

    protected override void OnDraw(Canvas canvas)
    {
      base.OnDraw(canvas);

      Paint pen = new Paint();
      pen.Color = Color.Red;
      pen.StrokeWidth = 1;
      pen.SetStyle(Paint.Style.Stroke);

      canvas.DrawLine(100, 100, 200, 90, pen); //not painted
      canvas.DrawLine(100, 100, 200, 100, pen);
      canvas.DrawLine(100, 100, 200, 110, pen); //not painted
      canvas.DrawLine(100, 100, 200, 120, pen); //not painted
      canvas.DrawLine(100, 100, 200, 130, pen); 

      pen.Color = Color.Lime;
      pen.StrokeWidth = 2;

      canvas.DrawLine(100, 200, 200, 190, pen);
      canvas.DrawLine(100, 200, 200, 200, pen);
      canvas.DrawLine(100, 200, 200, 210, pen);
      canvas.DrawLine(100, 200, 200, 220, pen);
      canvas.DrawLine(100, 200, 200, 230, pen);
    }
  }

  [Activity(Label = "My Activity", MainLauncher = true)]
  public class Activity1 : Activity
  {
    protected override void OnCreate(Bundle bundle)
    {
      base.OnCreate(bundle);

      var ctrl = new MyControl(this);
      SetContentView(ctrl);
    }
  }
}


Thanks in advance.


Best Regards,
 
Narcís Calvet
Steema Software
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