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 DrawDataLabels(Canvas canvas)
{
var currentLabelIndex = 0;
var offset = 0.0f;
foreach (var point in _chartPoints) {
var dataLabelValue = String.Format ("{0:P2}", datapoints [currentLabelIndex] / 100);
if (point.Y / chartPixelHeight > .5) {
offset = dataLabelOffset * -1;
} else {
offset = dataLabelOffset;
}
var yOffset = point.Y + offset;
var fm = new Android.Graphics.Paint.FontMetrics ();
_dataLabelPaint.GetFontMetrics (fm);
canvas.DrawRect (point.X - _dataLabelPaint.MeasureText (dataLabelValue) / 2,
yOffset - _dataLabelPaint.TextSize,
point.X + _dataLabelPaint.MeasureText (dataLabelValue)/2,
yOffset, _dataLabelBgPaint);
canvas.DrawText (dataLabelValue, point.X, yOffset, _dataLabelPaint);
canvas.DrawCircle (point.X, point.Y, 10.0f, _circlesPaint);
currentLabelIndex++;
}
}
private void IvCanvas_Touch(object sender, TouchEventArgs e)
{
float x = e.Event.GetX(), y = e.Event.GetY();
if (bitmap == null)
{
bitmap = Bitmap.CreateBitmap(ivCanvas.Width, ivCanvas.Height, Bitmap.Config.Argb8888);
canvas = new Canvas(bitmap);
size = (float)Math.Sqrt(Math.Pow(ivCanvas.Width, 2) + Math.Pow(ivCanvas.Height, 2));
}
if (e.Event.Action == MotionEventActions.Down)
{
prevX = x;
prevY = y;
}
if (rbPencil.Checked)
{
switch (e.Event.Action)
{
case MotionEventActions.Down:
canvas.DrawCircle(x, y, sbWidth.Progress, paint);
break;
case MotionEventActions.Move:
canvas.DrawLine(prevX, prevY, x, y, paint);
canvas.DrawCircle(x, y, sbWidth.Progress, paint);
break;
}
}
else if (rbHandwriting.Checked)
{
switch (e.Event.Action)
{
case MotionEventActions.Down:
Handwriting.distance = 0;
Handwriting.width = 0;
break;
case MotionEventActions.Move:
float d = (float)Math.Sqrt(Math.Pow(x - prevX, 2) + Math.Pow(y - prevY, 2)),
a = d / (float)Math.Pow(d, 2),
w = 0,
width = (float)Math.Pow(1 - d / size, 10) * paint.StrokeWidth,
xpd = (x - prevX) / d, ypd = (y - prevY) / d;
if (width >= Handwriting.width)
{
for (float f = 0; f < d; f += 4)
{
w = a * (float)Math.Pow(f, 2) / d * (width - Handwriting.width) + Handwriting.width;
canvas.DrawBitmap(Handwriting.brush, new Rect(0, 0, 192, 192), new Rect((int)(xpd * f + prevX - w), (int)(ypd * f + prevY - w), (int)(xpd * f + prevX + w), (int)(ypd * f + prevY + w)), paint);
}
}
else
{
for (float f = 0; f < d; f += 4)
{
w = (float)Math.Sqrt(f / a) / d * (width - Handwriting.width) + Handwriting.width;
canvas.DrawBitmap(Handwriting.brush, new Rect(0, 0, 192, 192), new Rect((int)(xpd * f + prevX - w), (int)(ypd * f + prevY - w), (int)(xpd * f + prevX + w), (int)(ypd * f + prevY + w)), paint);
}
}
Handwriting.distance = d;
Handwriting.width = w;
break;
case MotionEventActions.Up:
break;
}
}
else if (rbFill.Checked)
{
if (e.Event.Action == MotionEventActions.Down)
{
canvas.DrawPaint(paint);
}
}
else if (rbText.Checked)
{
fontMetrics = paint.GetFontMetrics();
canvas.DrawText(etText.Text, x, y - fontMetrics.Top / 2 - fontMetrics.Bottom / 2, paint);
}
else if (rbEraser.Checked)
{
switch (e.Event.Action)
{
case MotionEventActions.Down:
canvas.DrawCircle(x, y, sbWidth.Progress, paint);
break;
case MotionEventActions.Move:
canvas.DrawLine(prevX, prevY, x, y, paint);
canvas.DrawCircle(x, y, sbWidth.Progress, paint);
break;
}
}
if (e.Event.Action == MotionEventActions.Move)
{
prevX = x;
prevY = y;
}
ivCanvas.SetImageBitmap(bitmap);
}