88 lines
3.2 KiB
C#
88 lines
3.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace ImageCompressor
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{
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/// <summary>
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/// 计算保存Zoom的数据
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/// </summary>
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class ZoomFactor
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{
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static double zoomPercent = 0.1;
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/// <summary>
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/// [0.1 - 1]
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/// 对原图像的最短一边的像素 * value，作为新方形图像的一边像素值。
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/// </summary>
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public static double ZoomPercent
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{
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get
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{
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return zoomPercent;
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}
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set
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{
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if (value < 0.01) zoomPercent = 0.01;
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else if (value > 1) zoomPercent = 1;
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else zoomPercent = value;
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}
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}
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/// <summary>
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/// 新图像宽度的百分比
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/// </summary>
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double widthLocationPercent;
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/// <summary>
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/// 新图像高度的百分比
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/// </summary>
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double heightLocationPercent;
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public Rectangle GetSourceImage(Image image)
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{
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int rawImageHeight= image.Height;
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int rawImageWidth= image.Width;
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int NewImageX = (int)(rawImageWidth * widthLocationPercent);
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int NewImageY = (int)(rawImageHeight * heightLocationPercent);
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int NewImageSize = (int)(Math.Min(rawImageHeight, rawImageWidth) * zoomPercent);
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return new Rectangle(NewImageX - NewImageSize/2, NewImageY - NewImageSize / 2, NewImageSize, NewImageSize);
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}
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/// <summary>
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/// 获取当前缩放数据
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/// </summary>
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/// <param name="previewBoxRectangle"></param>
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/// <param name="location"></param>
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/// <param name="imageWidth"></param>
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/// <param name="imageHeight"></param>
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public ZoomFactor(Rectangle previewBoxRectangle, Point location, int imageWidth, int imageHeight)
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{
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double X = location.X; // - previewBoxRectangle.X;
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double Y = location.Y;// - previewBoxRectangle.Y;
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if ((double)imageWidth / (double)imageHeight > (double)previewBoxRectangle.Width / (double)previewBoxRectangle.Height)
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{
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double truePreviewBoxHeight = previewBoxRectangle.Width * ((double)imageHeight / (double)imageWidth);
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double offsetY = (previewBoxRectangle.Height - truePreviewBoxHeight) * 0.5;
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//图像比预览框更宽
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widthLocationPercent = X / (double)previewBoxRectangle.Width;
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heightLocationPercent = (Y - offsetY) / truePreviewBoxHeight;
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}
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else
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{
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double truePreivewBoxWidth = previewBoxRectangle.Height * ((double)imageWidth / (double)imageHeight);
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double offsetX = (previewBoxRectangle.Width - truePreivewBoxWidth) * 0.5;
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widthLocationPercent = (X - offsetX) / truePreivewBoxWidth;
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heightLocationPercent = Y / (double)previewBoxRectangle.Height;
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}
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//Debug.WriteLine("On Move percent w = {0}, h = {1}", widthLocationPercent, heightLocationPercent);
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}
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}
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}
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