我偶然发现过几次,并认为把它放在那里会很好。什么是你最好的图像调整大小和/或裁剪逻辑。想法是使用目标图像,尺寸和裁剪标记调用某些方法 - 这将返回或保存或任何所需的图像。
我的下面。从VB转换为C#所以是的,会有小错误,但逻辑是我们正在看的。
// INIT
// On/off
bool WeAreCropping = true;
// Get some dimensions
int TargetWidth = RequestedWidth;
int TargetHeight = RequestedHeight;
int SourceWidth = SourceImage.Width;
int SourceHeight = SourceImage.Height;
int ResizeWidth = TargetWidth;
int ResizeHeight = TargetHeight;
// GET RESIZE VALUES
// Are we cropping?
if (WeAreCropping) {
// Get source and target aspect ratio
double SourceAspectRatio = SourceWidth / SourceHeight;
double TargetAspectRatio = TargetWidth / TargetHeight;
// Compare aspect ratios to find out if we should we resize by
// width or height or nothing
if (TargetAspectRatio < SourceAspectRatio) {
ResizeWidth = TargetHeight / SourceHeight * SourceWidth;
}
else if (TargetAspectRatio > SourceAspectRatio) {
ResizeHeight = TargetWidth / SourceWidth * SourceHeight;
}
else {
// Same aspect ratio
}
}
else {
// If the target image is bigger than the source
if (TargetWidth > SourceWidth && TargetHeight > SourceHeight) {
TargetWidth = SourceWidth;
TargetHeight = SourceHeight;
}
double Ratio = 0;
// What ratio should we resize it by
if (SourceWidth / TargetWidth > SourceHeight / TargetHeight) {
Ratio = SourceWidth / TargetWidth;
}
else {
Ratio = SourceHeight / TargetHeight;
}
ResizeWidth = Math.Ceiling(SourceWidth / Ratio);
ResizeHeight = Math.Ceiling(SourceHeight / Ratio);
}
// TIME TO DO SUMFINK
// Resize the image using ResizeWidth and ResizeHeight
// Do it
if (WeAreCropping) {
// Crop the resized image at the center TargetWidth and TargetHeight
// Do it
}
我怀疑这可能会更优雅,所以也许你可以做得更好。
答案 0 :(得分:4)
我会说你应该使用像Rectangle
和Size
这样的标准几何类型。然后你应该也支持一个用例,当调用者想要将图像放在一个更大的矩形中时,但仍然希望保持原始图像大小的比例。
实现调整大小的一种方法是here。
答案 1 :(得分:0)
这可能比你需要的更多一些,但是对于一些高级裁剪技术的例子,check this out。