PDFBox - 带渐变的矩形

Question

我正在尝试使用Java中的PDFBox库创建pdf。我必须用渐变创建矩形，但我不知道怎么做，也找不到任何东西。任何人都可以帮我吗？

Answer 1

找到这个例子。看看它是否适合你

{%- block form_start -%}
    {% spaceless %}
        {% set method = method|upper %}
        {%- if method in ["GET", "POST"] -%}
            {% set form_method = method %}
        {%- else -%}
            {% set form_method = "POST" %}
        {%- endif -%}
        {% set attr = attr|merge({'class': (attr.class|default('form-horizontal'))|trim }) %}
        <form
        name="{{ name }}" method="{{ form_method|lower }}"{% if action != '' %} action="{{ action }}"{% endif %}{% for attrname, attrvalue in attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}{% if multipart %} enctype="multipart/form-data"{% endif %}>
        {%- if form_method != method -%}
            <input type="hidden" name="_method" value="{{ method }}"/>
        {%- endif -%}
    {% endspaceless %}
{%- endblock form_start -%}

{% block form_row %}
    {% spaceless %}
        <div class="form-group  row{{ errors|length > 0 ? ' has-error':'' }}">
            {{ form_label(form) }}
            <div class="col-10">
                {{ form_widget(form) }}
                {{ form_errors(form) }}
            </div>
        </div>
    {% endspaceless %}
{% endblock form_row %}

{# Labels #}

{%- block form_label -%}
    {% spaceless %}
        {% if label is not same as(false) -%}
            {% if not compound -%}
                {% set label_attr = label_attr|merge({'for': id}) %}
            {%- endif -%}
            {% if required -%}
                {% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ ' required')|trim}) %}
            {%- endif -%}
            {% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ ' col-sm-2 col-form-label')|trim }) %}
            {% if label is empty -%}
                {%- if label_format is not empty -%}
                    {% set label = label_format|replace({
                    '%name%': name,
                    '%id%': id,
                    }) %}
                {%- else -%}
                    {% set label = name|humanize %}
                {%- endif -%}
            {%- endif -%}
            <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>{{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}</label>
        {%- endif -%}
    {% endspaceless %}
{%- endblock form_label -%}

{# Widgets #}

{%- block form_widget_simple -%}
    {% spaceless %}
        {%- set type = type|default('text') -%}
        {% if type != 'file' %}
            {% set attr = attr|merge({'class': (attr.class|default('') ~ ' form-control')|trim }) %}
        {% endif %}
        <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
    {% endspaceless %}
{%- endblock form_widget_simple -%}

{%- block textarea_widget -%}
    {% spaceless %}
        {% set attr = attr|merge({'class': (attr.class|default('') ~ ' form-control')|trim }) %}
        <textarea {{ block('widget_attributes') }}>{{ value }}</textarea>
    {% endspaceless %}
{%- endblock textarea_widget -%}

{%- block choice_widget_collapsed -%}
    {% spaceless %}
        {%- if required and placeholder is none and not placeholder_in_choices and not multiple and (attr.size is not defined or attr.size <= 1) -%}
            {% set required = false %}
        {%- endif -%}
        {% set attr = attr|merge({'class': (attr.class|default('') ~ ' form-control')|trim }) %}
        <select {{ block('widget_attributes') }}{% if multiple %} multiple="multiple"{% endif %}>
            {%- if placeholder is not none -%}
                <option value=""{% if required and value is empty %} selected="selected"{% endif %}>{{ placeholder != '' ? (translation_domain is same as(false) ? placeholder : placeholder|trans({}, translation_domain)) }}</option>
            {%- endif -%}
            {%- if preferred_choices|length > 0 -%}
                {% set options = preferred_choices %}
                {{- block('choice_widget_options') -}}
                {%- if choices|length > 0 and separator is not none -%}
                    <option disabled="disabled">{{ separator }}</option>
                {%- endif -%}
            {%- endif -%}
            {%- set options = choices -%}
            {{- block('choice_widget_options') -}}
        </select>
    {% endspaceless %}
{%- endblock choice_widget_collapsed -%}

{%- block choice_widget_expanded -%}
    {% spaceless %}
        {%- for child in form %}
            <div class="checkbox">
                <label>
                    {{- form_widget(child) -}}
                    {{- form_label(child, null, {translation_domain: choice_translation_domain}) -}}
                </label>
            </div>
        {% endfor -%}
    {% endspaceless %}
{%- endblock choice_widget_expanded -%}

{% block form_errors %}
    {% spaceless %}
        {% for error in errors %}
            <span class="help-block">{{ error.message }}</span>
        {% endfor %}
    {% endspaceless %}
{% endblock form_errors %}

{% block button_row %}
    {% spaceless %}
        <div class="form-group row">
            <div class="offset-sm-2 col-sm-10">
                {{ form_widget(form) }}
            </div>
        </div>
    {% endspaceless %}
{% endblock button_row %}

{%- block button_widget -%}
    {%- if label is empty -%}
        {%- if label_format is not empty -%}
            {% set label = label_format|replace({
            '%name%': name,
            '%id%': id,
            }) %}
        {%- else -%}
            {% set label = name|humanize %}
        {%- endif -%}
    {%- endif -%}
    {% set attr = attr|merge({'class': (attr.class|default('') ~ ' btn')|trim }) %}
    <button type="{{ type|default('button') }}" {{ block('button_attributes') }}>{{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}</button>
{%- endblock button_widget -%}

{% block submit_widget %}
    {% spaceless %}
        {% set type = type|default('submit') %}
        {% set attr = attr|merge({'class': (attr.class|default('btn btn-primary'))|trim }) %}
        {{ block('button_widget') }}
    {% endspaceless %}
{% endblock submit_widget %}