Bug 18556 - Graphics.ScaleTransform and RotateTransform does not work properly
Summary: Graphics.ScaleTransform and RotateTransform does not work properly
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: System.Drawing ()
Version: 3.2.x
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2014-03-24 14:39 UTC by AndrewStx
Modified: 2014-05-08 22:57 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Results from Mac and Windows (17.51 KB, image/jpeg)
2014-03-24 14:39 UTC, AndrewStx

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Description AndrewStx 2014-03-24 14:39:21 UTC
Created attachment 6400 [details]
Results from Mac and Windows

Graphics.ScaleTransform and RotateTransform does not provide expected results as in .Net. Output is wrong and unusable.
TranslateTransform works just fine. I tried 3.2.6 and 3.2.7. Results are the same.
Below is the code to reproduce and screenshots in the attachment:
    class Program
        public static void Main(string[] args)

            Application.Run(new TestForm());


        public class TestForm : Form
            public TestForm()
                ClientSize = new Size(200, 200);

                Paint += (object sender, System.Windows.Forms.PaintEventArgs e) =>
                Graphics g = e.Graphics;
                Rectangle r = new Rectangle(0, 0, 100, 50);

                g.TranslateTransform(50, 50);
                g.FillRectangle(Brushes.Red, r);

                g.FillRectangle(Brushes.Green, r);

                g.ScaleTransform(0.5f, 0.5f);
                g.FillRectangle(Brushes.Blue, r);


Comment 1 contact 2014-05-08 22:57:55 UTC
Doesn't work for me on Linux either (Mono 3.0.6). The result is slightly different though: the red and blue rectangles are drawn correctly, but the green rectangle is not drawn at all.