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Added the quiet zone to the QRCodeWriter.

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git-svn-id: https://zxing.googlecode.com/svn/trunk@733 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
dswitkin 2008-11-19 16:39:59 +00:00
parent 549771b3de
commit a9b0be8b93
1 changed files with 11 additions and 3 deletions
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14
core/src/com/google/zxing/qrcode/QRCodeWriter.java
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@ -33,6 +33,8 @@ import java.util.Hashtable;
*/ */
public final class QRCodeWriter implements Writer { public final class QRCodeWriter implements Writer {
private static final int QUIET_ZONE_SIZE = 4;
public ByteMatrix encode(byte[] contents, BarcodeFormat format, int width, int height) public ByteMatrix encode(byte[] contents, BarcodeFormat format, int width, int height)
throws WriterException { throws WriterException {
@ -71,10 +73,16 @@ public final class QRCodeWriter implements Writer {
ByteMatrix input = code.matrix(); ByteMatrix input = code.matrix();
int inputWidth = input.width(); int inputWidth = input.width();
int inputHeight = input.height(); int inputHeight = input.height();
int outputWidth = Math.max(width, inputWidth); int qrWidth = inputWidth + (QUIET_ZONE_SIZE * 2);
int outputHeight = Math.max(height, inputHeight); int qrHeight = inputHeight + (QUIET_ZONE_SIZE * 2);
int outputWidth = Math.max(width, qrWidth);
int outputHeight = Math.max(height, qrHeight);
int multiple = Math.min(outputWidth / inputWidth, outputHeight / inputHeight); int multiple = Math.min(outputWidth / qrWidth, outputHeight / qrHeight);
// Padding includes both the quiet zone and the extra white pixels to accomodate the requested
// dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
// If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
// handle all the padding from 100x100 (the actual QR) up to 200x160.
int leftPadding = (outputWidth - (inputWidth * multiple)) / 2; int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
int topPadding = (outputHeight - (inputHeight * multiple)) / 2; int topPadding = (outputHeight - (inputHeight * multiple)) / 2;