php使用pchart绘制雷达图

需要注意：要把中文字体放到pchart插件库的字体文件夹里面，放其他地方都不生效。（巨坑！！！）

1.安装

composer require pchart/c-pchart

2.代码

        /* 准备一些好的数据和轴配置 */
        $data = new Data();
        $data->addPoints([40, 20, 15, 10, 8, 4, 4], "ScoreA");
        $data->addPoints([8, 10, 12, 20, 30, 15, 4], "ScoreB");
        $data->addPoints([11, 12, 13, 14, 15, 18, 4], "ScoreC");
        $data->addPoints([1, 2, 3, 4, 5, 6, 4], "ScoreD");
        $data->setSerieDescription("ScoreA", "我的");
        $data->setSerieDescription("ScoreB", "平均分");
        $data->setSerieDescription("ScoreC", "最高分");
        $data->setSerieDescription("ScoreD", "最低分");

        /*创建X系列*/
        $data->addPoints(["创新", "实践", "身心", "文化", "职业", "公益", "思想"], "Labels");
        $data->setAbscissa("Labels");

        /* 创建Image对象 */
        $image = new Image(700, 400, $data);
        /* 绘制实心背景 */
        $settings = array("R"=>255, "G"=>255, "B"=>255, "Dash"=>1, "DashR"=>255, "DashG"=>255, "DashB"=>255);
        $image->drawFilledRectangle(0, 0, 700, 400, $settings);

        /* 覆盖一些渐变区域 */
//        $settings = ["StartR" => 194, "StartG" => 231, "StartB" => 44, "EndR" => 43, "EndG" => 107, "EndB" => 58, "Alpha" => 50];
//        $image->drawGradientArea(0, 0, 700, 400, DIRECTION_VERTICAL, $settings);
//        $image->drawGradientArea(0, 0, 700, 20, DIRECTION_VERTICAL, [
//            "StartR" => 0,
//            "StartG" => 0,
//            "StartB" => 0,
//            "EndR" => 50,
//            "EndG" => 50,
//            "EndB" => 50,
//            "Alpha" => 100
//        ]);

        /* 绘制边界 */
//        $image->drawRectangle(0, 0, 699, 229, ["R" => 0, "G" => 0, "B" => 0]);

        /*写标题 */
// $image->setFontProperties(["FontName" => "Silkscreen.ttf", "FontSize" => 6]);
// $image->drawText(10, 13, "pRadar - Draw radar charts", ["R" => 255, "G" => 255,"B" => 255]);

        /* 定义总图参数 */
        $image->setFontProperties([
            "FontName" => 'msyh.ttc',
            "FontSize" => 10,
            "R" => 0,
            "G" => 0,
            "B" => 0
        ]);
//        $image->setShadow(true, ["X" => 2, "Y" => 2, "R" => 0, "G" => 0, "B" => 0, "Alpha" => 10]);

        /* 创建雷达对象 */
        $radarChart = new Radar();

        /* 绘制第一雷达图 */
        $image->setGraphArea(160, 5, 540, 325);
        $Options = ["Layout" => RADAR_LAYOUT_STAR, "BackgroundGradient" => [
            "StartR" => 255,
            "StartG" => 255,
            "StartB" => 255,
            "StartAlpha" => 100,
            "EndR" => 255,
            "EndG" => 255,
            "EndB" => 255,
            "EndAlpha" => 100
        ],
            'DrawAxisValues' => false,
            'DrawPoints' => false,
            'DrawPoly' => true,
            'LabelPos' => RADAR_LABELS_HORIZONTAL,
            'LabelsBGR' => 128,
            'LabelsBGG' => 128,
            'LabelsBGB' => 128,
        ];
        $radarChart->drawRadar($image, $data, $Options);

// /* Draw the 2nd radar chart */
// $image->setGraphArea(350, 25, 690, 225);
// $Options = ["Layout" => RADAR_LAYOUT_CIRCLE, "LabelPos" => RADAR_LABELS_HORIZONTAL, "BackgroundGradient" => [
//     "StartR" => 255,
//     "StartG" => 255,
//     "StartB" => 255,
//     "StartAlpha" => 50,
//     "EndR" => 32,
//     "EndG" => 109,
//     "EndB" => 174,
//     "EndAlpha" => 30
// ]];
// $radarChart->drawRadar($image, $data, $Options);

        /*写下传说 */
        $image->setFontProperties(["FontName" => 'msyh.ttc', "FontSize" => 12]);
        $image->drawLegend(240, 355, ["Style" => LEGEND_ROUND, "Mode" => LEGEND_HORIZONTAL, "Alpha" => 0, "FontR" => 128, "FontG" => 128, "FontB" => 128]);

        /* 渲染图片 */
//        $image->render(time().".png");
        // 输出图像，不使用缓存
        header("Content-Type: image/png");
        $image->render(NULL); // 直接输出到浏览器

手绘还是没有js好用，能不能就不用吧，放心交给前端。