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Many organizations get through the first five steps in this process successfully. They are able to roll out the phase-one version of operational and ad hoc reports for executives and managers and see some short-term value in the data displayed. Unfortunately, often the insight gathered from adoption of these tools is never fully realized, because time is not allocated after deployment to update business rules in the underlying applications based on the initial learning.



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To use WritePixels() successfully, you need to understand your image format and how it encodes pixels into bytes. For example, in a 32-bit bitmap type Bgra32, each pixel requires 4 bytes, one each for the blue, green, red, and alpha components. Here s how you can set them by hand, and then transfer them into an array: byte byte byte byte blue =100; green = 50; red = 50; alpha = 255;





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byte[] colorData = {blue, green, red, alpha}; Note that the order is critical here. The byte array must follow the blue, green, red, alpha sequence set out in the Bgra32 standard. When you call WritePixels(), you supply an Int32Rect that indicates the rectangular region of the bitmap that you want to update. The Int32Rect wraps four pieces of information: the X and Y coordinate of the top-left corner of the update region, and the width and height of the update region. The following code takes the colorData array shown in the preceding code and uses it to set the first pixel in the WriteableBitmap: // Update a single pixel. It's a region starting at (0,0) // that's 1 pixel wide and 1 pixel high. Int32Rect rect = new Int32Rect(0, 0, 1, 1); // Write the 4 bytes from the array into the bitmap. wb.WritePixels(rect, colorData, 4, 0); Using this approach, you could create a code routine that generates a WriteableBitmap. It simply needs to loop over all the columns and rows in the image, updating a single pixel in each iteration. for (int x = 0; x < wb.PixelWidth; x++)

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Whether you re a seasoned pro at writing SQL queries manually through a text editor or someone who prefers to design queries graphically, the end result is what matters. Accuracy, versatility, and efficiency of the underlying query are the three goals that designers strive to achieve. Accuracy is critical; however, having a query that s versatile enough to be used in more than one report and performs well makes the subsequent report design task much easier. For scalability and low response times, efficiency is paramount. A great report that takes 15 minutes to render will be a report your users rarely run. Keep the following goals in mind as you begin to develop your report queries: The query must contain accurate data: As the query logic becomes more complex, the chance of inaccuracy increases with extensive criteria and multiple joins. The query must be scalable: As the query is developed and tested, be aware that its performance might be entirely different as the load increases with more users. We cover performance monitoring with simulated loads in 8. However, in this chapter we ll show how to use tools to test query response times for a single execution in order to improve performance. The query should be versatile: Often a single query or stored procedure can drive many reports at once, saving on the time it takes to maintain, administer, and develop reports. However, delivering too much data to a report at once, to support both details and a summary, can impact performance. It s important to balance versatility with efficiency.

{ for (int y = 0; y < wb.PixelHeight; y++) { // Pick a pixel color using a formula of your choosing. byte blue = ... byte green = ... byte red = ... byte alpha = ... // Create the byte array. byte[] colorData = {blue, green, red, alpha}; // Pick the position where the pixel will be drawn. Int32Rect rect = new Int32Rect(x, y, 1, 1); // Calculate the stride. int stride = wb.PixelWidth * wb.Format.BitsPerPixel / 8; // Write the pixel. wb.WritePixels(rect, colorData, stride, 0); }

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