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C# UIImage.GetPixelColour方法代码示例

本文整理汇总了C#中UIKit.UIImage.GetPixelColour方法的典型用法代码示例。如果您正苦于以下问题:C# UIImage.GetPixelColour方法的具体用法?C# UIImage.GetPixelColour怎么用?C# UIImage.GetPixelColour使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在UIKit.UIImage的用法示例。


在下文中一共展示了UIImage.GetPixelColour方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。

示例1: GetOilPaintingColours

        private CGColor[,] GetOilPaintingColours(UIImage image)
        {
            var width = image.CGImage.Width;
            var height = image.CGImage.Height;
            var oilColours = new CGColor[width, height];

            var radius = 2;
            var intensity = 15;
            var intensityCount = new long[256];
            var sumR = new float[256];
            var sumG = new float[256];
            var sumB = new float[256];

            for( int pixelY = 0; pixelY < height; pixelY++)
            {
                for( int pixelX = 0; pixelX < width; pixelX++)
                {
                    // Find intensities of nearest nRadius pixels in four direction.
                    for( int borderPixelY = pixelY - radius; borderPixelY <= pixelY + radius; borderPixelY++ )
                    {
                        for( int borderPixelX = pixelX - radius; borderPixelX <= pixelX + radius; borderPixelX++ )
                        {
                            if(borderPixelX < 0 || borderPixelY < 0 || borderPixelX >= width || borderPixelY >= height)
                            {
                                continue;
                            }

                            var pixelColour = image.GetPixelColour(new CGPoint(borderPixelX, borderPixelY));

                            int currentPixelRed = (int)Math.Round(pixelColour.Components[0] * 255);
                            int currentPixelGreen = (int)Math.Round(pixelColour.Components[1] * 255);
                            int currentPixelBlue = (int)Math.Round(pixelColour.Components[2] * 255);

                            // Find intensity of RGB value and apply intensity level.
                            int currentIntensity =  (int)( ( (float)( currentPixelRed + currentPixelGreen + currentPixelBlue ) / 3.0 ) * intensity ) / 255;
                            if( currentIntensity > 255 )
                                currentIntensity = 255;
                            int i = currentIntensity;
                            intensityCount[i]++;

                            sumR[i] = sumR[i] + currentPixelRed;
                            sumG[i] = sumG[i] + currentPixelGreen;
                            sumB[i] = sumB[i] + currentPixelBlue;
                        }
                    }

                    nfloat currentMax = 0;
                    int maxIndex = 0;
                    for( var index = 0; index < 256; index++ )
                    {
                        if( intensityCount[index] > currentMax )
                        {
                            currentMax = intensityCount[index];
                            maxIndex = index;
                        }
                    }

                    oilColours[pixelX, pixelY] = new CGColor((sumR[maxIndex] / currentMax) / 255f, (sumG[maxIndex] / currentMax) / 255f, (sumB[maxIndex] / currentMax) / 255f, 1);

                    Array.Clear(intensityCount, 0, intensityCount.Length);
                    Array.Clear(sumR, 0, sumR.Length);
                    Array.Clear(sumG, 0, sumG.Length);
                    Array.Clear(sumB, 0, sumB.Length);
                }
            }
            return oilColours;
        }
开发者ID:MatthewSwarbrick,项目名称:OilPaintingFilter-Xamarin-iOS,代码行数:67,代码来源:HomeViewController.cs


注:本文中的UIKit.UIImage.GetPixelColour方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。