Android上的座標和裁剪PdfDocument

我一直很高興地在Android PDF類PdfDocument中生成PDF文檔。令人費解過來的「微妙」的文件後，我暗想，座標系是的PostScript（1/72" ）Android上的座標和裁剪PdfDocument

private static final int A4_WIDTH = 595; 
private static final int A4_HEIGHT = 842; 
private static final int CM = 28; 
private static final int footer_height = CM; 



void startPage() { 
    if (currentPage != null) { 
     finishPage(currentPage); 
    } 
    PageInfo.Builder pageBuilder = new PageInfo.Builder(A4_WIDTH, A4_HEIGHT, page++); 
    Rect rect = new Rect(0, 0, A4_WIDTH, A4_HEIGHT); 
    rect.inset(CM, 2 * CM); 
    pageBuilder.setContentRect(rect); 
    PageInfo pageInfo = pageBuilder.create(); 
    pagePosition = 0.0f; 
    pageWidth = rect.width(); 
    pageHeight = rect.height(); 
    currentPage = super.startPage(pageInfo); 
    page_count++; 
    if (has_footer) 
     putFooter(); 

}

這對我的Nexus 10的工作很好，但我感到相當吃驚的三星S6時的座標系看起來混亂了，所以在Nexus 10上，我把文本設置爲0,0，並且它恰好適合2cm和1cm，但是在S6上它出現了4cm和2cm的橫截面，而且底部和右側被剪裁了2cm和1cm。換句話說，剪切矩形是在正確的地方，但它出現的座標系統已經加倍抵消

我抽獎代碼如下所示：

 canvas.save(); 
     canvas.translate(0, pagePosition); 
     staticLayout.draw(canvas); 
     canvas.restore();

其中pagePosition是一個簡單的ps計數器，它通過測量staticLayout.getHeight（）的結果中的文本來驅動;

需要說明的是，佈局在文字，線條圖和圖像的相當複雜的混合上沒有缺陷，只是得到了這個設備相關的缺陷。

Bug或我的大腦？

編輯：左爲的Nexus，右是S6

生產代碼：

import android.annotation.TargetApi; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.Rect; 
import android.graphics.RectF; 
import android.graphics.pdf.PdfDocument; 
import android.support.v4.content.ContextCompat; 

import uk.co.spennycycles.pocketcycletech.PocketCycleTechApp; 
import uk.co.spennycycles.pocketcycletech.R; 



    @TargetApi(19) 

public class TestReport extends PdfDocument { 
private static final String TAG = SpennyPdfDocument.class.getSimpleName(); 
private static final int A4_WIDTH = 595; 
private static final int A4_HEIGHT = 842; 
private static final int CM = 28; 
int pageWidth; 
int pageHeight; 


public void generateReport() { 
PageInfo.Builder pageBuilder = new PageInfo.Builder(A4_WIDTH, A4_HEIGHT, 1); 
Rect rect = new Rect(0, 0, A4_WIDTH, A4_HEIGHT); 
rect.inset(CM, 2 * CM); 
pageBuilder.setContentRect(rect); 
PageInfo pageInfo = pageBuilder.create(); 
Page page = super.startPage(pageInfo); 

pageWidth = rect.width(); 
pageHeight = rect.height(); 
Canvas canvas = page.getCanvas(); 

RectF r = new RectF((float) 0, 0, pageWidth, pageHeight); 
r.inset(1.0f, 1.0f); 
Paint paint = new Paint(); 
paint.setAntiAlias(true); 
paint.setDither(true); 
paint.setStyle(Paint.Style.FILL); 

paint.setColor(ContextCompat.getColor(PocketCycleTechApp.getContext(), R.color.lt_gray)); 
canvas.drawRect(r, paint); 

paint.setColor(ContextCompat.getColor(PocketCycleTechApp.getContext(), R.color.black)); 

paint.setStrokeWidth(2.0f); 
paint.setStyle(Paint.Style.STROKE); 
canvas.drawRect(r, paint); 
paint.setStyle(Paint.Style.FILL_AND_STROKE); 

canvas.drawLine(r.left, r.top, r.right, r.bottom, paint); 
canvas.drawLine(r.right, r.top, r.left, r.bottom, paint); 

finishPage(page); 
} 
}

來源

2017-02-28 Ian Spencer

解決方法：

currentPage = super.startPage(pageInfo); 
    Canvas canvas = currentPage.getCanvas(); 
    canvas.translate(CM, CM*2); 
    canvas.clipRect(0, 0, rect.width(), rect.height());

離開畫布完全相同的狀態。

來源

2017-02-28 15:00:02

Android上的座標和裁剪PdfDocument

回答

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