打印尺寸和电子尺寸转换关系

gistfile1.txt

package com.bbbang.piece.api.piece

import com.xiaoleilu.hutool.util.ImageUtil
import io.micronaut.http.MediaType
import io.micronaut.http.server.types.files.StreamedFile
import net.glxn.qrgen.core.image.ImageType
import net.glxn.qrgen.javase.QRCode
import java.awt.AlphaComposite
import java.awt.Color
import java.awt.Font
import java.awt.RenderingHints
import java.awt.image.BufferedImage
import java.awt.image.RenderedImage
import java.io.File
import javax.imageio.ImageIO

/**
 * 测试图片生成
 */
fun main(args: Array<String>) {
    val outFilePath="C:\\Users\\bbbang\\Downloads\\out.png"
    val outFile= File(outFilePath)
    // 打印输出分辨率
    val dpi=300f//java default 72ppi
    //打印输出尺寸3X4cm
    val xCm=3// 3cm
    val yCm=4// 4cm
    //计算出来输出尺寸 354px, 471px
    val width = (xCm/2.54 * dpi).toInt()
    val height =(yCm/2.54 * dpi).toInt()

    val color = Color.BLACK

    val qrcodeOnePieceImage = BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)
    val graphics2D = qrcodeOnePieceImage.createGraphics()
    //g.setRenderingHint(RenderingHints.KEY_RESOLUTION_VARIANT,dotsPerInch)
    graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR)
    graphics2D.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    graphics2D.setRenderingHint(RenderingHints.KEY_TEXT_LCD_CONTRAST, 100)
    //消除文字锯齿
    graphics2D.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON)
    //消除画图锯齿
    graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)
    //画浅色背景
    graphics2D.color = Color(170, 233, 233) //  设置背景为浅色
    graphics2D.fillRect(0, 0, width, height) // 填充矩形区域
    //小程序名称 水印
    val title="乌鸦标题"
    val titleFontSize = 24
    val titleFont= Font("微软雅黑", Font.BOLD, titleFontSize)
    val titleWidth = graphics2D.getFontMetrics(titleFont).stringWidth(title)
    val titleX=(width - titleWidth) / 2
    val titleY: Int =  titleFontSize+20
    graphics2D.color = color
    graphics2D.font =titleFont
    graphics2D.composite = AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 1.0f)
    // 在指定坐标绘制水印文字
    graphics2D.drawString(title, titleX,titleY)
    //提醒扫码文字水印
    val tips="微信扫码 开始探索"
    val tipsFontSize = 14
    val tipsFont= Font("微软雅黑", Font.PLAIN, tipsFontSize)
    val tipsWidth = graphics2D.getFontMetrics(tipsFont).stringWidth(tips)
    val tipsX: Int = (width -tipsWidth) / 2
    val tipsY: Int =  tipsFontSize+8

    graphics2D.font =tipsFont
    graphics2D.drawString(tips,tipsX,titleY+tipsY)
    //二维码 水印
    val fileName="qrcode.png"
    val file: File = QRCode.from("https://qrcode.abc.com/html/111111").to(ImageType.PNG).withSize(125, 125).file()
    val streamFile= StreamedFile(file.inputStream(), MediaType.APPLICATION_OCTET_STREAM_TYPE).apply {
        attach(fileName)
    }
    val qrCodeImg = ImageIO.read(streamFile.inputStream)
    val qrCodeX=(width-qrCodeImg.width)/2
    val qrCodeY=tipsY+titleY+8

    graphics2D.drawImage(qrCodeImg, qrCodeX, qrCodeY, qrCodeImg.width, qrCodeImg.height, null)


    //编号水印 编号再最下面
    val no="编号: 010123456"
    val noFontSize = 14

    val noY=height-8
    val noFont= Font("微软雅黑", Font.PLAIN, noFontSize)
    val noWidth = graphics2D.getFontMetrics(noFont).stringWidth(no)
    val noX: Int = (width - noWidth) / 2
    graphics2D.font =noFont
    graphics2D.drawString(no,noX,noY)

    //口号水印 再编号水印上面
    val slogan="做最好的小米汽车参观"
    val sloganFontSize = 14
    val sloganFont= Font("微软雅黑", Font.PLAIN, sloganFontSize)
    val sloganWidth = graphics2D.getFontMetrics(sloganFont).stringWidth(slogan)
    val sloganX: Int = (width - sloganWidth) / 2
    graphics2D.font =sloganFont
    graphics2D.drawString(slogan,sloganX,height-noFontSize-16)

    graphics2D.dispose()
    ImageIO.write(qrcodeOnePieceImage as RenderedImage, ImageUtil.IMAGE_TYPE_PNG, outFile) // 输出到文件流
}