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.GC; import org.eclipse.swt.graphics.Path; import org.eclipse.swt.graphics.Pattern; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.graphics.Transform; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Menu; /** * This tab demonstrates the use of paths. It allows the user to see the * differences between filling, drawing and closing paths. */ public class PathTab extends GraphicsTab { Button colorButton, fillButton, drawButton, closeButton; GraphicsBackground fillColor; Menu menu; public PathTab(GraphicsExample example) { super(example); } @Override public String getCategory() { return GraphicsExample.getResourceString("Path"); //$NON-NLS-1$ } @Override public String getText() { return GraphicsExample.getResourceString("PathOper"); //$NON-NLS-1$ } @Override public String getDescription() { return GraphicsExample.getResourceString("PathOperDescription"); //$NON-NLS-1$ } @Override public void dispose() { if (menu != null) { menu.dispose(); menu = null; } } @Override public void createControlPanel(Composite parent) { Composite comp; // create draw button comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout()); drawButton = new Button(comp, SWT.TOGGLE); drawButton.setText(GraphicsExample.getResourceString("DrawPath")); //$NON-NLS-1$ drawButton.addListener(SWT.Selection, event -> example.redraw()); drawButton.setSelection(true); // create fill button comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout()); fillButton = new Button(comp, SWT.TOGGLE); fillButton.setText(GraphicsExample.getResourceString("FillPath")); //$NON-NLS-1$ fillButton.addListener(SWT.Selection, event -> example.redraw()); // create close button comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout()); closeButton = new Button(comp, SWT.TOGGLE); closeButton.setText(GraphicsExample.getResourceString("ClosePath")); //$NON-NLS-1$ closeButton.addListener(SWT.Selection, event -> example.redraw()); // create color button comp = new Composite(parent, SWT.NONE); comp.setLayout(new GridLayout()); ColorMenu cm = new ColorMenu(); cm.setPatternItems(example.checkAdvancedGraphics()); menu = cm.createMenu(parent.getParent(), gb -> { fillColor = gb; colorButton.setImage(gb.getThumbNail()); example.redraw(); }); // initialize the foreground to the 5th item in the menu (green) fillColor = (GraphicsBackground) menu.getItem(3).getData(); // color button colorButton = new Button(comp, SWT.PUSH); colorButton.setText(GraphicsExample.getResourceString("FillColor")); //$NON-NLS-1$ colorButton.setImage(fillColor.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) { if (!example.checkAdvancedGraphics()) return; Device device = gc.getDevice(); Pattern pattern = null; if (fillColor.getBgColor1() != null) { gc.setBackground(fillColor.getBgColor1()); } else if (fillColor.getBgImage() != null) { pattern = new Pattern(device, fillColor.getBgImage()); gc.setBackgroundPattern(pattern); } gc.setLineWidth(5); gc.setForeground(device.getSystemColor(SWT.COLOR_BLACK)); // arc Path path = new Path(device); path.addArc((width - 250) / 2, (height - 400) / 2, 500, 400, 90, 180); if (closeButton.getSelection()) path.close(); if (fillButton.getSelection()) gc.fillPath(path); if (drawButton.getSelection()) gc.drawPath(path); path.dispose(); // shape on left Transform transform = new Transform(device); transform.translate((width - 250) / 4, height / 2 - 150); gc.setTransform(transform); transform.dispose(); path = new Path(device); path.cubicTo(-150, 100, 150, 200, 0, 300); if (closeButton.getSelection()) path.close(); if (fillButton.getSelection()) gc.fillPath(path); if (drawButton.getSelection()) gc.drawPath(path); path.dispose(); gc.setTransform(null); // shape on right path = new Path(device); path.moveTo(3 * (width - 250) / 4 - 25 + 250, height / 2); path.lineTo(3 * (width - 250) / 4 + 50 + 250, height / 2 - 200); path.lineTo(3 * (width - 250) / 4 + 50 + 250, height / 2 + 50); path.lineTo(3 * (width - 250) / 4 - 25 + 250, height / 2 + 150); path.lineTo(3 * (width - 250) / 4 + 25 + 250, height / 2 + 50); if (closeButton.getSelection()) path.close(); if (fillButton.getSelection()) gc.fillPath(path); if (drawButton.getSelection()) gc.drawPath(path); path.dispose(); if (pattern != null) pattern.dispose(); } }