protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetTitle("顏色");
View view = LayoutInflater.From(this).Inflate(Resource.Layout.color, null);
builder.SetView(view);
adColor = builder.Create();
bColor = FindViewById <Button>(Resource.Id.b_color);
etText = FindViewById <EditText>(Resource.Id.et_text);
fontMetrics = paint.GetFontMetrics();
ivCanvas = FindViewById <ImageView>(Resource.Id.iv_canvas);
llPaint = FindViewById <LinearLayout>(Resource.Id.ll_paint);
rbEraser = FindViewById <RadioButton>(Resource.Id.rb_eraser);
rbFill = FindViewById <RadioButton>(Resource.Id.rb_fill);
rbHandwriting = FindViewById <RadioButton>(Resource.Id.rb_handwriting);
rbPencil = FindViewById <RadioButton>(Resource.Id.rb_pencil);
rbText = FindViewById <RadioButton>(Resource.Id.rb_text);
sbAlpha = view.FindViewById <SeekBar>(Resource.Id.sb_alpha);
sbBlue = view.FindViewById <SeekBar>(Resource.Id.sb_blue);
sbGreen = view.FindViewById <SeekBar>(Resource.Id.sb_green);
sbRed = view.FindViewById <SeekBar>(Resource.Id.sb_red);
sbSize = FindViewById <SeekBar>(Resource.Id.sb_size);
sbWidth = FindViewById <SeekBar>(Resource.Id.sb_width);
adColor.DismissEvent += AdColor_DismissEvent;
FindViewById <Button>(Resource.Id.b_clear).Click += BClear_Click;
bColor.Click += BSolidColor_Click;
FindViewById <Button>(Resource.Id.b_red).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_green).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_blue).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_yellow).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_cyan).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_magenta).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_black).Click += BMaterialDesignColor_Click;
FindViewById <Button>(Resource.Id.b_white).Click += BMaterialDesignColor_Click;
ivCanvas.Touch += IvCanvas_Touch;
FindViewById <RadioGroup>(Resource.Id.rg_tool).CheckedChange += RgTool_CheckedChange;
sbAlpha.ProgressChanged += SbColor_ProgressChanged;
sbBlue.ProgressChanged += SbColor_ProgressChanged;
sbGreen.ProgressChanged += SbColor_ProgressChanged;
sbRed.ProgressChanged += SbColor_ProgressChanged;
sbSize.ProgressChanged += SbSize_ProgressChanged;
sbWidth.ProgressChanged += SbWidth_ProgressChanged;
Handwriting.blackBrush = BitmapFactory.DecodeResource(Resources, Resource.Mipmap.brush);
Handwriting.brush = Handwriting.blackBrush.Copy(Bitmap.Config.Argb8888, true);
}
private void DrawIntoBitmap(Bitmap bm)
{
float x = bm.Width;
float y = bm.Height;
Canvas c = new Canvas (bm);
Paint p = new Paint ();
p.AntiAlias = true;
p.Alpha = 0x80;
c.DrawCircle (x / 2, y / 2, x / 2, p);
p.Alpha = 0x30;
p.SetXfermode (new PorterDuffXfermode (PorterDuff.Mode.Src));
p.TextSize = 60;
p.TextAlign = Paint.Align.Center;
Paint.FontMetrics fm = p.GetFontMetrics ();
c.DrawText ("Alpha", x / 2, (y - fm.Ascent) / 2, p);
}
/// <summary>
/// Gets font metrics for the font in the specified paint.
/// </summary>
/// <param name="paint">The paint.</param>
/// <param name="defaultLineHeight">Default line height.</param>
/// <param name="delta">The vertical delta.</param>
private void GetFontMetrics(Paint paint, out float defaultLineHeight, out float delta)
{
var metrics = paint.GetFontMetrics();
var ascent = -metrics.Ascent;
var descent = metrics.Descent;
var leading = metrics.Leading;
//// http://stackoverflow.com/questions/5511830/how-does-line-spacing-work-in-core-text-and-why-is-it-different-from-nslayoutm
leading = leading < 0 ? 0 : (float)Math.Floor(leading + 0.5f);
var lineHeight = (float)Math.Floor(ascent + 0.5f) + (float)Math.Floor(descent + 0.5) + leading;
var ascenderDelta = leading >= 0 ? 0 : (float)Math.Floor((0.2 * lineHeight) + 0.5);
defaultLineHeight = lineHeight + ascenderDelta;
delta = ascenderDelta - descent;
}
public Size MeasureString(string text, Font font)
{
using (var p = new Paint(this.paint))
using (var bounds = new Rect())
using (var fm = p.GetFontMetrics())
{
p.TextSize = font.Size;
p.SetTypeface(font.FontFamily.Typeface);
p.SetStyle(Paint.Style.Stroke);
p.GetTextBounds(text, 0, text.Length, bounds);
var width = bounds.Width();
var height = -fm.Top + fm.Bottom;
return new SizeF(width, height).ToSize();
}
}
public void Wrap(DroidTextLayoutBackend layout, AG.Paint paint)
{
var text = layout.Text;
var metrics = paint.GetFontMetrics();
Baseline = -metrics.Top;
LineHeight = -metrics.Ascent + metrics.Descent;
LineY = -metrics.Ascent; //- (metrics.Ascent + metrics.Descent);
var charWidths = new float[text.Length];
paint.GetTextWidths(text, charWidths);
var iLf = text.IndexOfAny(new char[] { '\n', '\r' });
HasLineFeed = iLf >= 0;
var textWidth = charWidths.Sum();
if (!HasLineFeed && (layout.Height <= 0 || layout.Height <= LineHeight) && (layout.Width <= 0 || textWidth <= layout.Width))
{
LineWidth = textWidth;
SingleLine(this);
}
else
{
MaxHeight = PreferedSize.Height > 0 ? PreferedSize.Height : (layout.Height <= 0 ? float.MaxValue : layout.Height);
MaxWidth = PreferedSize.Width > 0 ? PreferedSize.Width : (layout.Width <= 0 ? textWidth : layout.Width);
CursorPos = 0;
LineStart = 0;
while (LineY <= MaxHeight && CursorPos < text.Length)
{
LineWidth = 0f;
var whitePosY = -1f;
var whitepos = -1;
var newLine = false;
while (CursorPos < text.Length)
{
newLine = text [CursorPos] == '\n';
if (text [CursorPos] == '\r')
{
CursorPos++;
continue;
}
if (newLine)
{
break;
}
if (char.IsWhiteSpace(text [CursorPos]))
{
whitepos = CursorPos;
whitePosY = LineWidth;
}
LineWidth += charWidths [CursorPos];
if (LineWidth > MaxWidth)
{
if (whitepos > 0)
{
CursorPos = whitepos;
LineWidth = whitePosY;
}
break;
}
CursorPos++;
}
Action line = () => {
MultiLine(this);
LineY += LineHeight;
};
line();
CursorPos++;
LineStart = CursorPos;
if (newLine && CursorPos == text.Length)
{
line();
}
}
}
}
