Code example for php to draw a pie chart

Code example for php to draw a pie chart

// Variable definition: the angle of the elliptical arc Define ("ANGLELENGTH", 3 ); /** * Draw an image * @ Param $ title the title of a 3D image * @ Param $ data array displayed by dataArr * @ Param $ labelArr refers to the tag classification array of the corresponding data. * @ Param $ colorArr: array of the drawing color * @ Param $ a baseline width of the canvas * @ Param $ B baseline height of the canvas * @ Param $ v height of the 3D column * @ Param $ font size * @ Return indicates the access path of the successfully drawn image. */ Function drawPieImg ($ title, $ dataArr, $ labelArr, $ colorArr, $ a = 250, $ B = 120, $ v = 20, $ font = 10 ){ $ Ox = 5 + $; $ Oy = 5 + $ B; $ Fw = imagefontwidth ($ font ); $ Fh = imagefontheight ($ font ); $ N = count ($ dataArr); // calculates the array length. $ W = 10 + $ a * 2; $ H = 10 + $ B * 2 + $ v + ($ fh + 2) * $ n; // Create a canvas $ Img = imagecreate ($ w, $ h ); // Convert RGB to index color For ($ I = 0; $ I <$ n; $ I ++) $ ColorArr [$ I] = drawIndexColor ($ img, $ colorArr [$ I]); // assign a color to the image $ img $ Clrbk = imagecolorallocate ($ img, 0xff, 0xff, 0xff ); $ Clrt = imagecolorallocate ($ img, 0x00, 0x00, 0x00 ); // Fill in the background color Imagefill ($ img, 0, 0, $ clrbk ); // Sum $ Tot = 0; For ($ I = 0; $ I <$ n; $ I ++) $ Tot + = $ dataArr [$ I]; // Start angle of each category $ Sd = 0; // The angle of each category $ Ed = 0; $ Ly = 10 + $ B * 2 + $ v; For ($ I = 0; $ I <$ n; $ I ++ ){ $ Sd = $ ed; $ Ed + = $ dataArr [$ I]/$ tot * 360; // Draw a 3d fan surface Draw3DSector ($ img, $ ox, $ oy + 20, $ a, $ B, $ v, $ sd, $ ed, $ colorArr [$ I]); // Draw tags Imagefilledrectangle ($ img, 5, $ ly, 5 + $ fw, $ ly + $ fh, $ colorArr [$ I]); Imagerectangle ($ img, 5, $ ly, 5 + $ fw, $ ly + $ fh, $ clrt ); // Chinese transcoding $ Str = iconv ("GB2312", "UTF-8", $ labelArr [$ I]); Imagettftext ($ img, $ font, 0, 5 + 2 * $ fw, $ ly + 13, $ clrt, "D:/wamp/www/source/font/simhei. ttf ", $ str. ":". $ dataArr [$ I]. "(". (round (10000 * ($ dataArr [$ I]/$ tot)/100 ). "% )"); $ Ly + = $ fh + 2; } // Draw the image title Imagettftext ($ img, 15, 0, 5, 15, $ clrt, "D:/wamp/www/source/font/simhei. ttf ", iconv (" GB2312 "," UTF-8 ", $ title )); // Output image Header ("Content-type: image/png "); // Output the generated image $ ImgFileName = "./". time (). ". png "; Imagepng ($ img, $ imgFileName ); Return $ imgFileName; } /** * Draw a 3d fan surface */ Function draw3DSector ($ img, $ ox, $ oy, $ a, $ B, $ v, $ sd, $ ed, $ clr ){ DrawSector ($ img, $ ox, $ oy, $ a, $ B, $ sd, $ ed, $ clr ); If ($ sd <180 ){ List ($ red, $ green, $ blue) = drawDarkColor ($ img, $ clr ); // Assign color to the image $ Clr = imagecolorallocate ($ img, $ red, $ green, $ blue ); If ($ ed> 180) $ Ed = 180; List ($ sx, $ sy) = getExy ($ a, $ B, $ sd ); $ Sx + = $ ox; $ Sy + = $ oy; List ($ ex, $ ey) = getExy ($ a, $ B, $ ed ); $ Ex + = $ ox; $ Ey + = $ oy; Imageline ($ img, $ sx, $ sy, $ sx, $ sy + $ v, $ clr ); Imageline ($ img, $ ex, $ ey, $ ex, $ ey + $ v, $ clr ); DrawArc ($ img, $ ox, $ oy + $ v, $ a, $ B, $ sd, $ ed, $ clr ); List ($ sx, $ sy) = getExy ($ a, $ B, ($ sd + $ ed)/2 ); $ Sy + = $ oy + $ v/2; $ Sx + = $ ox; Imagefill ($ img, $ sx, $ sy, $ clr ); } } /** * Draw an elliptical arc */ Function drawArc ($ img, $ ox, $ oy, $ a, $ B, $ sd, $ ed, $ clr ){ $ N = ANGLELENGTH> 0? Ceil ($ ed-$ sd)/ANGLELENGTH):-1; $ D = $ sd; List ($ x0, $ y0) = getExy ($ a, $ B, $ d ); For ($ I = 0; $ I <$ n; $ I ++ ){ $ D = ($ d + ANGLELENGTH)> $ ed? $ Ed :( $ d + ANGLELENGTH ); List ($ x, $ y) = getExy ($ a, $ B, $ d ); Imageline ($ img, $ x0 + $ ox, $ y0 + $ oy, $ x + $ ox, $ y + $ oy, $ clr ); $ X0 = $ x; $ Y0 = $ y; } } /** * Draw fan surfaces */ Function drawSector ($ img, $ ox, $ oy, $ a, $ B, $ sd, $ ed, $ clr ){ $ N = ANGLELENGTH> 0? Ceil ($ ed-$ sd)/ANGLELENGTH):-1; $ D = $ sd; List ($ x0, $ y0) = getExy ($ a, $ B, $ d ); Imageline ($ img, $ x0 + $ ox, $ y0 + $ oy, $ ox, $ oy, $ clr ); For ($ I = 0; $ I <$ n; $ I ++ ){ $ D = ($ d + ANGLELENGTH)> $ ed? $ Ed :( $ d + ANGLELENGTH ); List ($ x, $ y) = getExy ($ a, $ B, $ d ); Imageline ($ img, $ x0 + $ ox, $ y0 + $ oy, $ x + $ ox, $ y + $ oy, $ clr ); $ X0 = $ x; $ Y0 = $ y; } Imageline ($ img, $ x0 + $ ox, $ y0 + $ oy, $ ox, $ oy, $ clr ); List ($ x, $ y) = getExy ($ a/2, $ B/2, ($ d + $ sd)/2 ); Imagefill ($ img, $ x + $ ox, $ y + $ oy, $ clr ); } /** * Obtain the shadow color of the corresponding column based on the $ clr color. * @ Param $ img Image * @ Param $ clr color * @ Return rgb color array */ Function drawDarkColor ($ img, $ clr ){ $ Rgb = imagecolorsforindex ($ img, $ clr ); Return array ($ rgb ["red"]/2, $ rgb ["green"]/2, $ rgb ["blue"]/2 ); } /** * Calculate the coordinate of the point on the elliptic corresponding to the angle $ d * * @ Param $ a abscissa * @ Param $ B y coordinate * @ Param $ d angle * @ Return corresponds to the coordinate of the elliptical dot. */ Function getExy ($ a, $ B, $ d ){ $ D = deg 2rad ($ d ); Return array (round ($ a * cos ($ d), round ($ B * sin ($ d ))); } /** * Assign an RGB index color to the image */ Function drawIndexColor ($ img, $ clr ){ $ Red = ($ clr> 16) & 0xff; $ Green = ($ clr> 8) & 0xff; $ Blue = ($ clr) & 0xff; Return imagecolorallocate ($ img, $ red, $ green, $ blue ); } // Test example $ Title = "distribution of animal species in the zoo "; $ DataArr = array (20, 10, 20, 20, 10, 20, 30, 10); // test data array $ LabelArr = array ("Elephant", "giraffe", "Crocodile", "ostrich", "Tiger", "Lion", "Monkey", "zebra "); // tag $ ColorArr = array (0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999); // color array $ Result = drawPieImg ($ title, $ dataArr, $ labelArr, $ colorArr ); Echo ""; ?> Code description: the drawPieImg () function contains eight parameters. $ title indicates the title of the pie chart, $ dataArr indicates the data array to be displayed, and $ labelArr indicates the tag classification array of the corresponding data; $ colorArr is the graphic color array of the corresponding data. these four parameters are required. you can pass the corresponding parameters for different system applications. The remaining four parameters are used to set the size of the pie chart to be generated. If this parameter is not set, the system default value is used. The program draws from 0 degrees based on the size of the array data at the bottom of the bed, and draws the fan size occupied by the corresponding data in clockwise direction. If you are interested, test the above code and see how the pie chart works ?!