PHP line chart generation functions and examples

PHP line chart generation functions and examples

/* * Generate a line chart in php * By bbs.it-home.org */ Function line_stats_pic ($ value_y, $ width, $ high, $ strong = 1, $ fix = 0 ){ // Y value processing function Function line_point_y ($ num, $ width, $ high, $ max_num_add, $ min_num_add, $ y_pxdensity ){ $ Return = $ high-floor ($ num-$ min_num_add + $ y_pxdensity)/($ max_num_add-$ min_num_add)/$ high )); Return $ return; } // Parameter processing $ Allnum = sizeof ($ value_y ); $ Max_num = max ($ value_y); // maximum value $ Min_num = min ($ value_y); // minimum value $ Limit_m = $ max_num-$ min_num; // very short $ Max_num_add = $ max_num + $ limit_m * 0.1; // maximum value of the axis $ Min_num_add = $ min_num-$ limit_m * 0.1; // minimum value of the axis $ Limit = $ max_num_add-$ min_num_add; // range-coordinate axis y $ Y_pxdensity = ($ max_num_add-$ min_num_add)/$ high; // Y axis density $ X_pxdensity = floor ($ width/$ allnum); // x axis density Reset ($ value_y); // returns the array pointer to zero. $ I = 0; Foreach ($ value_y as $ val ){ $ Point_y [$ I] = line_point_y ($ val, $ width, $ high, $ max_num_add, $ min_num_add, $ y_pxdensity ); $ I ++; } $ Zero_y = line_point_y (0, $ width, $ high, $ max_num_add, $ min_num_add, $ y_pxdensity); // the y value of the zero point $ Empty_size_x = (strlen ($ max_num)> strlen ($ min_num )? Strlen ($ max_num): strlen ($ min_num) * 5 + 3; // left blank // Starts the image stream Header ("Content-type: image/png "); $ Pic = imagecreate ($ width + $ empty_size_x + 10, $ high + 13 ); Imagecolorallocate ($ pic, 255,255,255); // background color $ Color_1 = imagecolorallocate ($ pic, 30,144,255); // Line color $ Color_2 = imagecolorallocate ($ pic, 0, 0); // Black $ Color_3 = imagecolorallocate ($ pic, 194,194,194); // Gray // Draw a grid Imagesetthickness ($ pic, 1); // mesh width $ Y_line_width = floor ($ width/100); // number of vertical gridlines $ Y_line_density = $ y_line_width = 0? 0: floor ($ width/$ y_line_width); // The vertical gridline density. $ Point_zero_y = $ zero_y> $ high? $ High: $ zero_y; Imagestring ($ pic, 1, $ empty_size_x-1, $ high + 4, "0", $ color_2); // zero axis marker For ($ I = 1; $ I <= $ y_line_width; $ I ++) {// draw vertical gridlines Imagesetthickness ($ pic, 1); // mesh width Imageline ($ pic, $ y_line_density * $ I + $ empty_size_x, 0, $ y_line_density * $ I + $ empty_size_x, $ high, $ color_3 ); Imagesetthickness ($ pic, 2); // axis width Imageline ($ pic, $ y_line_density * $ I + $ empty_size_x, $ point_zero_y-4, $ y_line_density * $ I + $ empty_size_x, $ point_zero_y, $ color_2 ); Imagestring ($ pic, 1,100 * $ I + $ empty_size_x-5, $ high + 4, $ allnum/$ y_line_width * $ I, $ color_2); // axis marker } $ X_line_width = floor ($ high/30); // Number of Horizontal gridlines $ X_line_density = $ x_line_width = 0? 0: floor ($ high/$ y_line_width); // horizontal grid line density If ($ zero_y> $ high) {// draw a grid line Imagestring ($ pic, $ high-3, round ($ min_num_add, $ fix), $ color_2); // zero axis mark For ($ I = 1; $ I <= $ x_line_width; $ I ++ ){ Imagesetthickness ($ pic, 1); // mesh width Imageline ($ pic, 0 + $ empty_size_x, $ high-$ x_line_density * $ I, $ width + $ empty_size_x, $ high-$ x_line_density * $ I, $ color_3 ); Imagesetthickness ($ pic, 2); // axis width Imageline ($ pic, 0 + $ empty_size_x, $ high-$ x_line_density * $ I, 3 + $ empty_size_x, $ high-$ x_line_density * $ I, $ color_2 ); Imagestring ($ pic, 1, 0, $ high-$ x_line_density * $ I-3, round ($ limit/$ x_line_width * $ I + $ min_num_add, $ fix), $ color_2 ); // number axis mark } } Else { Imagestring ($ pic, 1, $ empty_size_x-8, $ zero_y, "0", $ color_2); // zero axis marker For ($ I = 1; $ I <= ceil ($ x_line_width/2); $ I ++ ){ Imagesetthickness ($ pic, 1); // mesh width Imageline ($ pic, 0 + $ empty_size_x, $ zero_y-$ x_line_density * $ I, $ width + $ empty_size_x, $ zero_y-$ x_line_density * $ I, $ color_3 ); If ($ zero_y + $ x_line_density * $ I <$ high ){ Imageline ($ pic, 0 + $ empty_size_x, $ zero_y + $ x_line_density * $ I, $ width + $ empty_size_x, $ zero_y + $ x_line_density * $ I, $ color_3 ); } Imagesetthickness ($ pic, 2); // axis width Imageline ($ pic, 0 + $ empty_size_x, $ zero_y-$ x_line_density * $ I, 3 + $ empty_size_x, $ zero_y-$ x_line_density * $ I, $ color_2 ); If ($ zero_y + $ x_line_density * $ I <$ high ){ Imageline ($ pic, 0 + $ empty_size_x, $ zero_y + $ x_line_density * $ I, 3 + $ empty_size_x, $ zero_y + $ x_line_density * $ I, $ color_2 ); } Imagestring ($ pic, $ zero_y-$ x_line_density * $ I-3, round ($ limit/$ x_line_width * $ I, $ fix), $ color_2); // Number of axis markers If ($ zero_y + $ x_line_density * $ I <$ high ){ Imagestring ($ pic, $ zero_y + $ x_line_density * $ I-3, round (-$ limit/$ x_line_width * $ I, $ fix), $ color_2); // Number of axis markers } } } // Draw the axis Imagesetthickness ($ pic, 2); // axis width Imageline ($ pic, 1 + $ empty_size_x, 0, 1 + $ empty_size_x, $ high, $ color_2 ); If ($ zero_y> $ high) {// x axis position Imageline ($ pic, 0 + $ empty_size_x, $ high, $ width + $ empty_size_x, $ high, $ color_2 ); } Else { Imageline ($ pic, 0 + $ empty_size_x, $ zero_y, $ width + $ empty_size_x, $ zero_y, $ color_2 ); } // Generate a line $ Point_x = 0; $ J = 0; Imagesetthickness ($ pic, $ strong); // line width While ($ j + 1 <$ allnum ){ Imageline ($ pic, $ point_x + 2 + $ empty_size_x, $ point_y [$ j], $ point_x + $ x_pxdensity + 2 + $ empty_size_x, $ point_y [$ j + 1], $ color_1 ); $ Point_x + = $ x_pxdensity; $ J ++; } Imagepng ($ pic ); Imagedestroy ($ pic ); } For ($ I = 0; I I <100; $ I ++ ){ $ Value = revert (1,200 ); $ Value_y [] = $ value; } Line_stats_pic ($ value_y, 500,100, 1, 1 ); ?>