Posted By

ptomas on 07/26/12

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Last Edited at 07/26/12 06:02pm

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MVC3 atvaizduoti grafika

/ Published in: C#

grafikas atvaizduojamas kreive, pyrago forma, stulpeliais. Pateikiamas kaip sugeneruotas png failas.

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// kodas chtml faile:
// <img src="@Url.Action("grafikas")" alt="Drawing chart with HTML Helper" />

// kodas kontroleryje:
[ActionName("grafikas")]    // ---------------- galima keist path pagal regionus!
        //[OutputCache(Duration = 3)]   // ------------ jei nustatomas keshavimas, kai issaugot bandai gaunasi .bmp failas
        public ActionResult DrawChart()
        {
            /*
             * reikia pasiimt iÃƒï¿½Ã¯Â¿Â½ÃƒÂ¯Ã‚Â¿Ã‚Â½Ãƒï¿½Ã¯Â¿Â½Ãƒï¿½Ã‚Â¡ sistemos userio Guid, tai nereikÃƒï¿½Ã¯Â¿Â½ÃƒÂ¯Ã‚Â¿Ã‚Â½Ãƒï¿½Ã‚Â¯Ãƒï¿½Ã‚Â¿Ãƒï¿½Ã‚Â½s nieko perduot per parametrus!!!
             */

string[] arrYvalues = new string[10];
            string[] arrXvalues = new string[10];
            Random rn = new Random();

for (int i = 1; i < 10; i++)
            {
                arrXvalues[i] = i.ToString();
                arrYvalues[i] = i.ToString() + rn.Next(10).ToString();
            }

string myTheme =
                       @"<Chart BackColor=""255, 255, 255"" >
	                        <ChartAreas>
	                            <ChartArea Name=""Default"" BorderColor=""255, 255, 255"" BorderDashStyle=""Solid"" BackColor=""Transparent"" ShadowColor=""Transparent"">
                                    <AxisY LineColor=""64, 64, 64, 64"">
                                        <MajorGrid Interval=""Auto"" LineColor=""64, 64, 64, 64"" />
                                        <LabelStyle Font=""Trebuchet MS, 8.25pt"" />
                                    </AxisY>
                                    <AxisX LineColor=""64, 64, 64, 64"">
                                        <MajorGrid Interval=""Auto"" LineColor=""64, 64, 64, 64"" />
                                        <LabelStyle Interval=""Auto"" Font=""Trebuchet MS, 8.25pt"" />
                                    </AxisX>
                                </ChartArea>
	                        </ChartAreas>
	                    </Chart>";

var chart = new Chart(width: 500, height: 250, theme: myTheme)
                .AddSeries(
                            chartType: "line",
                            xValue: arrXvalues,
                            yValues: arrYvalues)
                            .GetBytes("png");

return File(chart, "image/bytes");
        }

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