mirror of
https://github.com/Ryujinx/GtkSharp.git
synced 2024-09-09 00:13:20 +02:00
97 lines
3.0 KiB
C#
97 lines
3.0 KiB
C#
using System;
|
|
using Gtk;
|
|
using Pango;
|
|
|
|
#if GTK_SHARP_2_6
|
|
namespace GtkDemo
|
|
{
|
|
[Demo ("Rotated Text", "DemoRotatedText.cs")]
|
|
public class DemoRotatedText : Window
|
|
{
|
|
const int RADIUS = 150;
|
|
const int N_WORDS = 10;
|
|
|
|
public DemoRotatedText () : base ("Rotated text")
|
|
{
|
|
DrawingArea drawingArea = new DrawingArea ();
|
|
Gdk.Color white = new Gdk.Color (0xff, 0xff, 0xff);
|
|
|
|
// This overrides the background color from the theme
|
|
drawingArea.ModifyBg (StateType.Normal, white);
|
|
drawingArea.ExposeEvent += new ExposeEventHandler (RotatedTextExposeEvent);
|
|
|
|
this.Add (drawingArea);
|
|
this.DeleteEvent += new DeleteEventHandler (OnWinDelete);
|
|
this.SetDefaultSize (2 * RADIUS, 2 * RADIUS);
|
|
this.ShowAll ();
|
|
}
|
|
|
|
void RotatedTextExposeEvent (object sender, ExposeEventArgs a)
|
|
{
|
|
DrawingArea drawingArea = sender as DrawingArea;
|
|
|
|
int width = drawingArea.Allocation.Width;
|
|
int height = drawingArea.Allocation.Height;
|
|
|
|
double deviceRadius;
|
|
|
|
// Get the default renderer for the screen, and set it up for drawing
|
|
Gdk.PangoRenderer renderer = Gdk.PangoRenderer.GetDefault (drawingArea.Screen);
|
|
renderer.Drawable = drawingArea.GdkWindow;
|
|
renderer.Gc = drawingArea.Style.BlackGC;
|
|
|
|
// Set up a transformation matrix so that the user space coordinates for
|
|
// the centered square where we draw are [-RADIUS, RADIUS], [-RADIUS, RADIUS]
|
|
// We first center, then change the scale
|
|
deviceRadius = Math.Min (width, height) / 2;
|
|
Matrix matrix = Pango.Matrix.Identity;
|
|
matrix.Translate (deviceRadius + (width - 2 * deviceRadius) / 2, deviceRadius + (height - 2 * deviceRadius) / 2);
|
|
matrix.Scale (deviceRadius / RADIUS, deviceRadius / RADIUS);
|
|
|
|
// Create a PangoLayout, set the font and text
|
|
Context context = drawingArea.CreatePangoContext ();
|
|
Pango.Layout layout = new Pango.Layout (context);
|
|
layout.SetText ("Text");
|
|
FontDescription desc = FontDescription.FromString ("Sans Bold 27");
|
|
layout.FontDescription = desc;
|
|
|
|
// Draw the layout N_WORDS times in a circle
|
|
for (int i = 0; i < N_WORDS; i++)
|
|
{
|
|
Gdk.Color color = new Gdk.Color ();
|
|
Matrix rotatedMatrix = matrix;
|
|
int w, h;
|
|
double angle = (360 * i) / N_WORDS;
|
|
|
|
// Gradient from red at angle == 60 to blue at angle == 300
|
|
color.Red = (ushort) (65535 * (1 + Math.Cos ((angle - 60) * Math.PI / 180)) / 2);
|
|
color.Green = 0;
|
|
color.Blue = (ushort) (65535 - color.Red);
|
|
|
|
renderer.SetOverrideColor (RenderPart.Foreground, color);
|
|
|
|
rotatedMatrix.Rotate (angle);
|
|
context.Matrix = rotatedMatrix;
|
|
|
|
// Inform Pango to re-layout the text with the new transformation matrix
|
|
layout.ContextChanged ();
|
|
layout.GetSize (out w, out h);
|
|
renderer.DrawLayout (layout, - w / 2, (int) (- RADIUS * Pango.Scale.PangoScale));
|
|
}
|
|
|
|
// Clean up default renderer, since it is shared
|
|
renderer.SetOverrideColor (RenderPart.Foreground, Gdk.Color.Zero);
|
|
renderer.Drawable = null;
|
|
renderer.Gc = null;
|
|
}
|
|
|
|
void OnWinDelete (object sender, DeleteEventArgs a)
|
|
{
|
|
this.Hide ();
|
|
this.Dispose ();
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|