public ImageProperties(
float scale = 1,
string semanticLabel = null,
float width = 0.0f,
float height = 0.0f,
Color color = null,
BlendMode colorBlendMode = BlendMode.srcOver,
BoxFit fit = BoxFit.fill,
Alignment alignment = null,
ImageRepeat repeat = ImageRepeat.noRepeat,
Rect centerSlice = null,
bool matchTextDirection = false,
FilterMode filterQuality = FilterMode.Bilinear
)
{
this.scale = scale;
this.semanticLabel = semanticLabel;
this.width = width;
this.height = height;
this.color = color;
this.colorBlendMode = colorBlendMode;
this.fit = fit;
this.alignment = alignment ?? Alignment.center;
this.repeat = repeat;
this.centerSlice = centerSlice;
this.matchTextDirection = matchTextDirection;
this.filterQuality = filterQuality;
}
public static FittedSizes applyBoxFit(BoxFit fit, Size inputSize, Size outputSize)
{
if (inputSize.height <= 0.0 ||
inputSize.width <= 0.0 ||
outputSize.height <= 0.0 ||
outputSize.width <= 0.0)
{
return(new FittedSizes(Size.zero, Size.zero));
}
Size sourceSize = null;
Size destinationSize = null;
switch (fit)
{
case BoxFit.fill:
sourceSize = inputSize;
destinationSize = outputSize;
break;
case BoxFit.contain:
sourceSize = inputSize;
if (outputSize.width / outputSize.height > sourceSize.width / sourceSize.height)
{
destinationSize = new Size(sourceSize.width * outputSize.height / sourceSize.height,
outputSize.height);
}
else
{
destinationSize = new Size(outputSize.width,
sourceSize.height * outputSize.width / sourceSize.width);
}
break;
case BoxFit.cover:
if (outputSize.width / outputSize.height > inputSize.width / inputSize.height)
{
sourceSize = new Size(inputSize.width, inputSize.width * outputSize.height / outputSize.width);
}
else
{
sourceSize = new Size(inputSize.height * outputSize.width / outputSize.height,
inputSize.height);
}
destinationSize = outputSize;
break;
case BoxFit.fitWidth:
sourceSize = new Size(inputSize.width, inputSize.width * outputSize.height / outputSize.width);
destinationSize = new Size(outputSize.width,
sourceSize.height * outputSize.width / sourceSize.width);
break;
case BoxFit.fitHeight:
sourceSize = new Size(inputSize.height * outputSize.width / outputSize.height, inputSize.height);
destinationSize = new Size(sourceSize.width * outputSize.height / sourceSize.height,
outputSize.height);
break;
case BoxFit.none:
sourceSize = new Size(Mathf.Min(inputSize.width, outputSize.width),
Mathf.Min(inputSize.height, outputSize.height));
destinationSize = sourceSize;
break;
case BoxFit.scaleDown:
sourceSize = inputSize;
destinationSize = inputSize;
float aspectRatio = inputSize.width / inputSize.height;
if (destinationSize.height > outputSize.height)
{
destinationSize = new Size(outputSize.height * aspectRatio,
outputSize.height);
}
if (destinationSize.width > outputSize.width)
{
destinationSize = new Size(outputSize.width, outputSize.width / aspectRatio);
}
break;
}
return(new FittedSizes(sourceSize, destinationSize));
}
