Java tutorial
/******************************************************************************* * Copyright (c) 2006, 2016 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.swt.examples.graphics; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Device; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Pattern; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.Spinner; /** * This tab demonstrates line styles applicable to a line. It shows the use of the * <code>GC.setLineStyle()</code> method. */ public class LineStyleTab extends GraphicsTab { Button colorButton; GraphicsBackground lineColor; Menu menu; Spinner lineWidthSpinner; public LineStyleTab(GraphicsExample example) { super(example); } @Override public String getCategory() { return GraphicsExample.getResourceString("Lines"); //$NON-NLS-1$ } @Override public String getText() { return GraphicsExample.getResourceString("LineStyles"); //$NON-NLS-1$ } @Override public String getDescription() { return GraphicsExample.getResourceString("LineStylesDescription"); //$NON-NLS-1$ } @Override public void dispose() { if (menu != null) { menu.dispose(); menu = null; } } @Override public void createControlPanel(Composite parent) { Composite comp; comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout(2, false)); new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("LineWidth")); //$NON-NLS-1$ lineWidthSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP); lineWidthSpinner.setSelection(10); lineWidthSpinner.setMinimum(1); lineWidthSpinner.setMaximum(30); lineWidthSpinner.addListener(SWT.Selection, event -> example.redraw()); ColorMenu cm = new ColorMenu(); cm.setPatternItems(example.checkAdvancedGraphics()); menu = cm.createMenu(parent.getParent(), gb -> { lineColor = gb; colorButton.setImage(gb.getThumbNail()); example.redraw(); }); // create color button comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout()); // initialize the foreground to the 5th item in the menu (blue) lineColor = (GraphicsBackground) menu.getItem(4).getData(); // color button colorButton = new Button(comp, SWT.PUSH); colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$ colorButton.setImage(lineColor.getThumbNail()); colorButton.addListener(SWT.Selection, event -> { final Button button = (Button) event.widget; final Composite parent1 = button.getParent(); Rectangle bounds = button.getBounds(); Point point = parent1.toDisplay(new Point(bounds.x, bounds.y)); menu.setLocation(point.x, point.y + bounds.height); menu.setVisible(true); }); } @Override public void paint(GC gc, int width, int height) { Device device = gc.getDevice(); Pattern pattern = null; if (lineColor.getBgColor1() != null) { gc.setForeground(lineColor.getBgColor1()); } else if (lineColor.getBgImage() != null) { pattern = new Pattern(device, lineColor.getBgImage()); gc.setForegroundPattern(pattern); } // set line width gc.setLineWidth(lineWidthSpinner.getSelection()); // draw lines with caps gc.drawLine(3 * width / 16, 1 * height / 6, 13 * width / 16, 1 * height / 6); gc.setLineStyle(SWT.LINE_DASH); gc.drawLine(3 * width / 16, 2 * height / 6, 13 * width / 16, 2 * height / 6); gc.setLineStyle(SWT.LINE_DOT); gc.drawLine(3 * width / 16, 3 * height / 6, 13 * width / 16, 3 * height / 6); gc.setLineStyle(SWT.LINE_DASHDOT); gc.drawLine(3 * width / 16, 4 * height / 6, 13 * width / 16, 4 * height / 6); gc.setLineStyle(SWT.LINE_DASHDOTDOT); gc.drawLine(3 * width / 16, 5 * height / 6, 13 * width / 16, 5 * height / 6); // draw labels Font font = new Font(device, getPlatformFont(), 20, SWT.NORMAL); gc.setFont(font); gc.setForeground(device.getSystemColor(SWT.COLOR_BLACK)); String text = GraphicsExample.getResourceString("Solid"); //$NON-NLS-1$ Point size = gc.stringExtent(text); gc.drawString(text, (width - size.x) / 2, 1 * height / 12, true); text = GraphicsExample.getResourceString("Dash"); //$NON-NLS-1$ size = gc.stringExtent(text); gc.drawString(text, (width - size.x) / 2, 3 * height / 12, true); text = GraphicsExample.getResourceString("Dot"); //$NON-NLS-1$ size = gc.stringExtent(text); gc.drawString(text, (width - size.x) / 2, 5 * height / 12, true); text = GraphicsExample.getResourceString("DashDot"); //$NON-NLS-1$ size = gc.stringExtent(text); gc.drawString(text, (width - size.x) / 2, 7 * height / 12, true); text = GraphicsExample.getResourceString("DashDotDot"); //$NON-NLS-1$ size = gc.stringExtent(text); gc.drawString(text, (width - size.x) / 2, 9 * height / 12, true); font.dispose(); } /** * Returns the name of a valid font for the resident platform. */ static String getPlatformFont() { if (SWT.getPlatform() == "win32") { return "Arial"; } else if (SWT.getPlatform() == "gtk") { return "Baekmuk Batang"; } else { return "Verdana"; } } }