graphicsoutputtest.java

这是个国外JAVA爱好者写的条形码生成器

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package net.sourceforge.barbecue.output;

import net.sourceforge.barbecue.BarcodeTestCase;
import net.sourceforge.barbecue.GraphicsMock;
import net.sourceforge.barbecue.env.DefaultEnvironment;

import java.awt.*;
import java.awt.font.TextLayout;
import java.awt.image.BufferedImage;
import java.util.List;

public class GraphicsOutputTest extends BarcodeTestCase {
	private Color fgColour;
	private Color bgColour;
	private GraphicsMock g;
	private GraphicsOutput output;

	protected void setUp() throws Exception {
		super.setUp();
		fgColour = Color.black;
		bgColour = Color.pink;
		g = new GraphicsMock();
		output = new GraphicsOutput(g, DefaultEnvironment.DEFAULT_FONT, fgColour, bgColour);
	}

	public void testDrawBarDrawsRectangle() throws Exception {
		output.drawBar(0, 0, 10, 100, true);
		List rects = g.getRects();
		assertEquals(1, rects.size());
		assertEquals(new Rectangle(0, 0, 10, 100), rects.get(0));
		assertEquals(g.getColor(), fgColour);
	}

	public void testDrawBarUsingBackgroundColourActuallyDrawsWithBackgroundColour() throws Exception {
		output.drawBar(0, 0, 10, 100, false);
		assertEquals(g.getColor(), bgColour);
	}

	public void testDrawTextFillsRectangleBehindText() throws Exception {
		String text = "FOO";
		TextLayout layout = new TextLayout(text, DefaultEnvironment.DEFAULT_FONT, g.getFontRenderContext());
		output.drawText(text, LabelLayoutFactory.createCenteredLayout(0, 0, 100));
		List rects = g.getRects();
		assertEquals(1, rects.size());
		assertEquals(new Rectangle(0, 0, 100, (int) layout.getBounds().getHeight() + CenteredLabelLayout.BARS_TEXT_VGAP + 1), rects.get(0));
	}

	public void testDrawTextRendersString() throws Exception {
		output.drawText("FOO", LabelLayoutFactory.createCenteredLayout(0, 0, 100));
		Rectangle r = g.getTextBounds();
		assertTrue(r.getWidth() > 0);
		assertTrue(r.getHeight() > 0);
	}

	public void testDrawTextReturnsHeightOfTextAreaDrawn() throws Exception {
		String text = "FOO";
		TextLayout layout = new TextLayout(text, DefaultEnvironment.DEFAULT_FONT, g.getFontRenderContext());
		int height = (int) layout.getBounds().getHeight() + CenteredLabelLayout.BARS_TEXT_VGAP + 1;
		assertEquals(height, (int) output.drawText(text, LabelLayoutFactory.createCenteredLayout(0, 0, 100)));
	}

	public void testBeginThenEndDrawRestoresoriginalGraphicsColour() throws Exception {
		Graphics2D g = (Graphics2D) new BufferedImage(100, 100, BufferedImage.TYPE_BYTE_GRAY).getGraphics();
		g.setColor(Color.cyan);
		output = new GraphicsOutput(g, DefaultEnvironment.DEFAULT_FONT, fgColour, bgColour);
		output.beginDraw();
		output.endDraw(100, 100);
		assertEquals(Color.cyan, g.getColor());
    }

    public void testTextIsNotDrawnIfFontIsNull() throws Exception {
        output = new GraphicsOutput(g, null, fgColour, bgColour);
        double height = output.drawText("FOO", LabelLayoutFactory.createCenteredLayout(0, 0, 100));
        assertEquals(0, (int) height);
		assertNull(g.getTextBounds());
    }

	public void testTextHeightStillCalculatedWhenNotPainting() throws Exception {
		String text = "FOO";
		TextLayout layout = new TextLayout(text, DefaultEnvironment.DEFAULT_FONT, g.getFontRenderContext());
		int height = (int) layout.getBounds().getHeight() + CenteredLabelLayout.BARS_TEXT_VGAP + 1;
		output = new GraphicsOutput(g, DefaultEnvironment.DEFAULT_FONT, fgColour, bgColour);
		assertEquals(height, (int) output.drawText(text, LabelLayoutFactory.createCenteredLayout(0, 0, 100)));
	}
}