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PDF output: always create a DIN A4 page. That is the ONLY same format.
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This commit is contained in:
Manuel Friedli 2026-01-24 04:40:42 +01:00
parent cae4221157
commit b89b87d7e9
Signed by: manuel
GPG key ID: 41D08ABA75634DA1
1 changed files with 30 additions and 14 deletions
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44
src/main/java/ch/fritteli/maze/generator/renderer/pdf/Generator.java
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@ -5,7 +5,6 @@ import ch.fritteli.maze.generator.model.Maze;
import ch.fritteli.maze.generator.model.Position; import ch.fritteli.maze.generator.model.Position;
import ch.fritteli.maze.generator.model.Tile; import ch.fritteli.maze.generator.model.Tile;
import io.vavr.control.Option; import io.vavr.control.Option;
import lombok.RequiredArgsConstructor;
import lombok.Value; import lombok.Value;
import lombok.extern.slf4j.Slf4j; import lombok.extern.slf4j.Slf4j;
import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDDocument;
@ -20,18 +19,31 @@ import java.awt.*;
import java.io.ByteArrayOutputStream; import java.io.ByteArrayOutputStream;
import java.io.IOException; import java.io.IOException;
@RequiredArgsConstructor
@Slf4j @Slf4j
class Generator { class Generator {
private static final PDRectangle REFERENCE_PAGE = PDRectangle.A4;
private static final int DPI = 72;
private static final double CM_PER_INCH = 2.54;
private static final double DOT_PER_CM = DPI / CM_PER_INCH;
// 1.5cm margin on each side of the page
private static final float MARGIN = (float) (1.5 * DOT_PER_CM);
@NonNull @NonNull
private final Maze maze; private final Maze maze;
private final float stepSize;
Generator(@NonNull final Maze maze) {
this.maze = maze;
final float usableWidth = REFERENCE_PAGE.getWidth() - 2 * MARGIN;
final float usableHeight = REFERENCE_PAGE.getHeight() - 2 * MARGIN;
final float stepWidth = usableWidth / maze.getWidth();
final float stepHeight = usableHeight / maze.getHeight();
this.stepSize = Math.min(stepWidth, stepHeight);
}
@NonNull @NonNull
public ByteArrayOutputStream generate() { public ByteArrayOutputStream generate() {
final float pageWidth = this.maze.getWidth() * PDFRenderer.SCALE + 2 * PDFRenderer.MARGIN;
final float pageHeight = this.maze.getHeight() * PDFRenderer.SCALE + 2 * PDFRenderer.MARGIN;
final PDDocument pdDocument = new PDDocument(); final PDDocument pdDocument = new PDDocument();
final PDDocumentInformation info = new PDDocumentInformation(); final PDDocumentInformation info = new PDDocumentInformation();
info.setTitle("Maze %sx%s, ID %s (%s)".formatted( info.setTitle("Maze %sx%s, ID %s (%s)".formatted(
@ -41,8 +53,8 @@ class Generator {
this.maze.getAlgorithm() this.maze.getAlgorithm()
)); ));
pdDocument.setDocumentInformation(info); pdDocument.setDocumentInformation(info);
final PDPage puzzlePage = new PDPage(new PDRectangle(pageWidth, pageHeight)); final PDPage puzzlePage = new PDPage(REFERENCE_PAGE);
final PDPage solutionPage = new PDPage(new PDRectangle(pageWidth, pageHeight)); final PDPage solutionPage = new PDPage(REFERENCE_PAGE);
pdDocument.addPage(puzzlePage); pdDocument.addPage(puzzlePage);
pdDocument.addPage(solutionPage); pdDocument.addPage(solutionPage);
try (final PDPageContentStream puzzlePageContentStream = new PDPageContentStream(pdDocument, puzzlePage); try (final PDPageContentStream puzzlePageContentStream = new PDPageContentStream(pdDocument, puzzlePage);
@ -75,7 +87,7 @@ class Generator {
private void drawHorizontalLines(@NonNull final PDPageContentStream... contentStreams) throws IOException { private void drawHorizontalLines(@NonNull final PDPageContentStream... contentStreams) throws IOException {
// PDF has the origin in the lower left corner. We want it in the upper left corner, hence some magic is required. // PDF has the origin in the lower left corner. We want it in the upper left corner, hence some magic is required.
Coordinate coordinate = new Coordinate(0f, 0f); Coordinate coordinate = new Coordinate(0, 0);
// Draw the TOP borders of all tiles. // Draw the TOP borders of all tiles.
for (int y = 0; y < this.maze.getHeight(); y++) { for (int y = 0; y < this.maze.getHeight(); y++) {
boolean isPainting = false; boolean isPainting = false;
@ -248,11 +260,15 @@ class Generator {
@Value @Value
private class Coordinate { private class Coordinate {
float x; float x;
float y; float y;
public Coordinate(final float x, final float y) { public Coordinate(final int x, final int y) {
this.x = this.calcX(x);
this.y = this.calcY(y);
}
private Coordinate(final float x, final float y) {
this.x = x; this.x = x;
this.y = y; this.y = y;
} }
@ -262,7 +278,7 @@ class Generator {
} }
private float calcX(final int x) { private float calcX(final int x) {
return x * PDFRenderer.SCALE + PDFRenderer.MARGIN; return x * Generator.this.stepSize + Generator.MARGIN;
} }
public Coordinate withY(final int y) { public Coordinate withY(final int y) {
@ -270,7 +286,7 @@ class Generator {
} }
private float calcY(final int y) { private float calcY(final int y) {
return (Generator.this.maze.getHeight() - y) * PDFRenderer.SCALE + PDFRenderer.MARGIN; return (Generator.this.maze.getHeight() - y) * Generator.this.stepSize + Generator.MARGIN;
} }
} }
@ -286,11 +302,11 @@ class Generator {
} }
private float calcX(final int x) { private float calcX(final int x) {
return x * PDFRenderer.SCALE + PDFRenderer.SCALE / 2 + PDFRenderer.MARGIN; return x * Generator.this.stepSize + Generator.this.stepSize / 2 + Generator.MARGIN;
} }
private float calcY(final int y) { private float calcY(final int y) {
return (Generator.this.maze.getHeight() - y) * PDFRenderer.SCALE - PDFRenderer.SCALE / 2 + PDFRenderer.MARGIN; return (Generator.this.maze.getHeight() - y) * Generator.this.stepSize - Generator.this.stepSize / 2 + Generator.MARGIN;
} }
} }
} }