/// <summary>
/// 缩放图片
/// </summary>
/// <param name="drawable"></param>
/// <param name="maxWidth"></param>
/// <returns></returns>
private Bitmap ScalingDrawable(Android.Graphics.Drawables.Drawable drawable, int maxWidth)
{
if (drawable == null || drawable.IntrinsicWidth == 0 || drawable.IntrinsicHeight == 0)
{
return(null);
}
int width = drawable.IntrinsicWidth;
int height = drawable.IntrinsicHeight;
try
{
Bitmap image = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
Canvas canvas = new Canvas(image);
drawable.SetBounds(0, 0, width, height);
drawable.Draw(canvas);
// 精确缩放
if (maxWidth <= 0 || width <= maxWidth)
{
return(image);
}
float scale = maxWidth / (float)width;
Matrix matrix = new Matrix();
matrix.PostScale(scale, scale);
Bitmap resizeImage = Bitmap.CreateBitmap(image, 0, 0, width, height, matrix, true);
image.Recycle();
return(resizeImage);
}
catch (OutOfMemoryError)
{
return(null);
}
}
protected override void Draw(Canvas canvas, Rect bounds)
{
int saveCount = canvas.Save();
RectF arcBounds = mTempBounds;
arcBounds.Set(bounds);
arcBounds.Inset(mStrokeXInset, mStrokeYInset);
mCurrentProgressBounds.Set(arcBounds.Left, arcBounds.Bottom - 2 * mCenterRadius, arcBounds.Right, arcBounds.Bottom);
//Draw loading Drawable
mLoadingDrawable.SetBounds((int)arcBounds.CenterX() - mLoadingDrawable.IntrinsicWidth / 2, 0, (int)arcBounds.CenterX() + mLoadingDrawable.IntrinsicWidth / 2, mLoadingDrawable.IntrinsicHeight);
mLoadingDrawable.Draw(canvas);
//Draw progress background
float progressInset = mCenterRadius - mProgressCenterRadius;
RectF progressRect = new RectF(mCurrentProgressBounds);
//sub DEFAULT_STROKE_INTERVAL, otherwise will have a interval between progress background and progress outline
progressRect.Inset(progressInset - DEFAULT_STROKE_INTERVAL, progressInset - DEFAULT_STROKE_INTERVAL);
mPaint.Color = new Color(mProgressBgColor);
mPaint.SetStyle(Paint.Style.Fill);
canvas.DrawRoundRect(progressRect, mProgressCenterRadius, mProgressCenterRadius, mPaint);
//Draw progress
mPaint.Color = new Color(mProgressColor);
mPaint.SetStyle(Paint.Style.Fill);
canvas.DrawPath(CreateProgressPath(mProgress, mProgressCenterRadius, progressRect), mPaint);
//Draw leaves
for (int i = 0; i < mLeafHolders.Count; i++)
{
int leafSaveCount = canvas.Save();
LeafHolder leafHolder = mLeafHolders[i];
Rect leafBounds = leafHolder.mLeafRect;
canvas.Rotate(leafHolder.mLeafRotation, leafBounds.CenterX(), leafBounds.CenterY());
mLeafDrawable.Bounds = leafBounds;
mLeafDrawable.Draw(canvas);
canvas.RestoreToCount(leafSaveCount);
}
//Draw progress background outline,
//after Drawing the leaves and then Draw the outline of the progress background can
//prevent the leaves from flying to the outside
RectF progressOutlineRect = new RectF(mCurrentProgressBounds);
float progressOutlineStrokeInset = (mCenterRadius - mProgressCenterRadius) / 2.0f;
progressOutlineRect.Inset(progressOutlineStrokeInset, progressOutlineStrokeInset);
mPaint.SetStyle(Paint.Style.Stroke);
mPaint.Color = new Color(mProgressBgColor);
mPaint.StrokeWidth = mCenterRadius - mProgressCenterRadius;
canvas.DrawRoundRect(progressOutlineRect, mCenterRadius, mCenterRadius, mPaint);
//Draw electric fan outline
float electricFanCenterX = arcBounds.Right - mCenterRadius;
float electricFanCenterY = arcBounds.Bottom - mCenterRadius;
mPaint.Color = new Color(mElectricFanOutlineColor);
mPaint.SetStyle(Paint.Style.Stroke);
mPaint.StrokeWidth = mStrokeWidth;
canvas.DrawCircle(arcBounds.Right - mCenterRadius, arcBounds.Bottom - mCenterRadius, mCenterRadius - mStrokeWidth / 2.0f, mPaint);
//Draw electric background
mPaint.Color = new Color(mElectricFanBgColor);
mPaint.SetStyle(Paint.Style.Fill);
canvas.DrawCircle(arcBounds.Right - mCenterRadius, arcBounds.Bottom - mCenterRadius, mCenterRadius - mStrokeWidth + DEFAULT_STROKE_INTERVAL, mPaint);
//Draw electric fan
int rotateSaveCount = canvas.Save();
canvas.Rotate(mRotation, electricFanCenterX, electricFanCenterY);
mElectricFanDrawable.SetBounds((int)(electricFanCenterX - mElectricFanDrawable.IntrinsicWidth / 2 * mScale), (int)(electricFanCenterY - mElectricFanDrawable.IntrinsicHeight / 2 * mScale), (int)(electricFanCenterX + mElectricFanDrawable.IntrinsicWidth / 2 * mScale), (int)(electricFanCenterY + mElectricFanDrawable.IntrinsicHeight / 2 * mScale));
mElectricFanDrawable.Draw(canvas);
canvas.RestoreToCount(rotateSaveCount);
//Draw 100% text
if (mScale < 1.0f)
{
mPaint.TextSize = mTextSize * (1 - mScale);
mPaint.Color = new Color(mElectricFanOutlineColor);
Rect textRect = new Rect();
mPaint.GetTextBounds(PERCENTAGE_100, 0, PERCENTAGE_100.Length, textRect);
canvas.DrawText(PERCENTAGE_100, electricFanCenterX - textRect.Width() / 2.0f, electricFanCenterY + textRect.Height() / 2.0f, mPaint);
}
canvas.RestoreToCount(saveCount);
}