build.gradleを書く

build.gradle

apply plugin: 'idea'
apply plugin: 'groovy'
apply plugin: 'application'

def defaultEncoding = 'UTF-8'
def jdkVersion = '1.7'
def localJars = fileTree(dir: 'lib', includes: ['*.jar'])

sourceCompatibility = jdkVersion
targetCompatibility = jdkVersion

repositories {
    mavenCentral()
}

dependencies {
    compile 'org.codehaus.groovy:groovy-all:2.1.7'
    compile localJars
}

compileGroovy {
    groovyOptions.encoding = defaultEncoding
}

idea {
    project {
        jdkName = jdkVersion
        languageLevel = jdkVersion
    }
}

Processingのjarをコピー

プロジェクト直下のlibディレクトリにダウンロードしたProcessingのcore/libraryから以下のjarをコピー

core.jar
gluegen-rt.jar
gluegen-rt-natives-windows-amd64.jar
jogl-all.jar
jogl-all-natives-windows-amd64.jar

コードを書く

DisplayTest.groovy

package episode001

import groovy.swing.SwingBuilder
import processing.core.PApplet

import javax.swing.JFrame

class DisplayTest extends PApplet {

    def void setup() {
    }

    def void draw() {
        background(0, 0, 0)
    }

    def static void main(args) {
        def display = new DisplayTest()
        new SwingBuilder().frame(
                title: 'Episode 1 – Display Test',
                defaultCloseOperation: JFrame.EXIT_ON_CLOSE,
                size: [640, 480], show: true) {
            widget(display)
        }
        display.init()
    }
}