// renders a page to the given graphics
public void renderPage(
PDPage page, Paint paint, Canvas canvas, int width, int height, float scaleX, float scaleY)
throws IOException {
canvas.scale(scaleX, scaleY);
// TODO should we be passing the scale to PageDrawer rather than messing with Graphics?
PDRectangle cropBox = page.getCropBox();
int rotationAngle = page.getRotation();
if (rotationAngle != 0) {
float translateX = 0;
float translateY = 0;
switch (rotationAngle) {
case 90:
translateX = cropBox.getHeight();
break;
case 270:
translateY = cropBox.getWidth();
break;
case 180:
translateX = cropBox.getWidth();
translateY = cropBox.getHeight();
break;
}
canvas.translate(translateX, translateY);
canvas.rotate((float) Math.toRadians(rotationAngle));
}
PageDrawer drawer = new PageDrawer(page);
drawer.drawPage(paint, canvas, cropBox);
}
/**
* Returns the given page as an RGB image at the given scale.
*
* @param pageIndex the zero-based index of the page to be converted
* @param scale the scaling factor, where 1 = 72 DPI
* @param config the bitmap config to create
* @return the rendered page image
* @throws IOException if the PDF cannot be read
*/
public Bitmap renderImage(int pageIndex, float scale, Bitmap.Config config) throws IOException {
PDPage page = document.getPage(pageIndex);
PDRectangle cropbBox = page.getCropBox();
float widthPt = cropbBox.getWidth();
float heightPt = cropbBox.getHeight();
int widthPx = Math.round(widthPt * scale);
int heightPx = Math.round(heightPt * scale);
int rotationAngle = page.getRotation();
// swap width and height
Bitmap image;
if (rotationAngle == 90 || rotationAngle == 270) {
image = Bitmap.createBitmap(heightPx, widthPx, config);
} else {
image = Bitmap.createBitmap(widthPx, heightPx, config);
}
// use a transparent background if the imageType supports alpha
Paint paint = new Paint();
Canvas canvas = new Canvas(image);
if (config != Bitmap.Config.ARGB_8888) {
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.FILL);
canvas.drawRect(0, 0, image.getWidth(), image.getHeight(), paint);
paint.reset();
}
renderPage(page, paint, canvas, image.getWidth(), image.getHeight(), scale, scale);
return image;
}
/**
* Returns the given page as an RGB or ARGB image at the given scale.
*
* @param pageIndex the zero-based index of the page to be converted
* @param scale the scaling factor, where 1 = 72 DPI
* @param imageType the type of image to return
* @return the rendered page image
* @throws IOException if the PDF cannot be read
*/
public BufferedImage renderImage(int pageIndex, float scale, ImageType imageType)
throws IOException {
PDPage page = document.getPage(pageIndex);
PDRectangle cropbBox = page.getCropBox();
float widthPt = cropbBox.getWidth();
float heightPt = cropbBox.getHeight();
int widthPx = Math.round(widthPt * scale);
int heightPx = Math.round(heightPt * scale);
int rotationAngle = page.getRotation();
// swap width and height
BufferedImage image;
if (rotationAngle == 90 || rotationAngle == 270) {
image = new BufferedImage(heightPx, widthPx, imageType.toBufferedImageType());
} else {
image = new BufferedImage(widthPx, heightPx, imageType.toBufferedImageType());
}
// use a transparent background if the imageType supports alpha
Graphics2D g = image.createGraphics();
if (imageType == ImageType.ARGB) {
g.setBackground(new Color(0, 0, 0, 0));
} else {
g.setBackground(Color.WHITE);
}
renderPage(page, g, image.getWidth(), image.getHeight(), scale, scale);
g.dispose();
return image;
}
/** Initialises the stream engine for the given page. */
private void initPage(PDPage page) {
if (page == null) {
throw new IllegalArgumentException("Page cannot be null");
}
currentPage = page;
graphicsStack.clear();
graphicsStack.push(new PDGraphicsState(page.getCropBox()));
textMatrix = null;
textLineMatrix = null;
resources = null;
initialMatrix = page.getMatrix();
}
/**
* Renders a given page to an AWT Graphics2D instance.
*
* @param pageIndex the zero-based index of the page to be converted
* @param graphics the Graphics2D on which to draw the page
* @param scale the scale to draw the page at
* @throws IOException if the PDF cannot be read
*/
public void renderPageToGraphics(int pageIndex, Graphics2D graphics, float scale)
throws IOException {
PDPage page = document.getPage(pageIndex);
// TODO need width/wight calculations? should these be in PageDrawer?
PDRectangle adjustedCropBox = page.getCropBox();
renderPage(
page,
graphics,
(int) adjustedCropBox.getWidth(),
(int) adjustedCropBox.getHeight(),
scale,
scale);
}
// renders a page to the given graphics
private void renderPage(
PDPage page, Graphics2D graphics, int width, int height, float scaleX, float scaleY)
throws IOException {
graphics.clearRect(0, 0, width, height);
graphics.scale(scaleX, scaleY);
// TODO should we be passing the scale to PageDrawer rather than messing with Graphics?
PDRectangle cropBox = page.getCropBox();
int rotationAngle = page.getRotation();
if (rotationAngle != 0) {
float translateX = 0;
float translateY = 0;
switch (rotationAngle) {
case 90:
translateX = cropBox.getHeight();
break;
case 270:
translateY = cropBox.getWidth();
break;
case 180:
translateX = cropBox.getWidth();
translateY = cropBox.getHeight();
break;
}
graphics.translate(translateX, translateY);
graphics.rotate((float) Math.toRadians(rotationAngle));
}
// the end-user may provide a custom PageDrawer
PageDrawerParameters parameters = new PageDrawerParameters(this, page);
PageDrawer drawer = createPageDrawer(parameters);
drawer.drawPage(graphics, cropBox);
}
