package tutorial.chapter02;

import com.itextpdf.kernel.colors.Color;
import com.itextpdf.kernel.colors.DeviceCmyk;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import java.io.File;
import java.io.IOException;

/**
 * Simple changing graphics state example.
 */
public class C02E02_GridLines {

    public static final String DEST = "results/chapter02/grid_lines.pdf";

    public static void main(String args[]) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C02E02_GridLines().createPdf(DEST);
    }

    public void createPdf(String dest) throws IOException {

        //Initialize PDF document
        PdfDocument pdf = new PdfDocument(new PdfWriter(dest));

        PageSize ps = PageSize.A4.rotate();
        PdfPage page = pdf.addNewPage(ps);

        PdfCanvas canvas = new PdfCanvas(page);
        //Replace the origin of the coordinate system to the center of the page
        canvas.concatMatrix(1, 0, 0, 1, ps.getWidth() / 2, ps.getHeight() / 2);

        Color grayColor = new DeviceCmyk(0.f, 0.f, 0.f, 0.875f);
        Color greenColor = new DeviceCmyk(1.f, 0.f, 1.f, 0.176f);
        Color blueColor = new DeviceCmyk(1.f, 0.156f, 0.f, 0.118f);
        
        canvas.setLineWidth(0.5f).setStrokeColor(blueColor);

        //Draw horizontal grid lines
        for (int i = -((int) ps.getHeight() / 2 - 57); i < ((int) ps.getHeight() / 2 - 56); i += 40) {
            canvas.moveTo(-(ps.getWidth() / 2 - 15), i)
                    .lineTo(ps.getWidth() / 2 - 15, i);
        }
        //Draw vertical grid lines
        for (int j = -((int) ps.getWidth() / 2 - 61); j < ((int) ps.getWidth() / 2 - 60); j += 40) {
            canvas.moveTo(j, -(ps.getHeight() / 2 - 15))
                    .lineTo(j, ps.getHeight() / 2 - 15);
        }
        canvas.stroke();

        //Draw axes
        canvas.setLineWidth(3).setStrokeColor(grayColor);
        C02E01_Axes.drawAxes(canvas, ps);

        //Draw plot
        canvas.setLineWidth(2).setStrokeColor(greenColor)
                .setLineDash(10, 10, 8)
                .moveTo(-(ps.getWidth() / 2 - 15), -(ps.getHeight() / 2 - 15))
                .lineTo(ps.getWidth() / 2 - 15, ps.getHeight() / 2 - 15).stroke();

        //Close document
        pdf.close();

    }
}