1 /*******************************************************************************
2 * Copyright (c) 2006, 2016 IBM Corporation and others.
3 *
4 * This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License 2.0
6 * which accompanies this distribution, and is available at
7 * https://www.eclipse.org/legal/epl-2.0/
8 *
9 * SPDX-License-Identifier: EPL-2.0
10 *
11 * Contributors:
12 * IBM Corporation - initial API and implementation
13 *******************************************************************************/
14
15 package org.eclipse.swt.examples.graphics;
16
17 import org.eclipse.swt.SWT;
18 import org.eclipse.swt.graphics.Device;
19 import org.eclipse.swt.graphics.Font;
20 import org.eclipse.swt.graphics.GC;
21 import org.eclipse.swt.graphics.Pattern;
22 import org.eclipse.swt.graphics.Point;
23 import org.eclipse.swt.graphics.Rectangle;
24 import org.eclipse.swt.layout.GridLayout;
25 import org.eclipse.swt.widgets.Button;
26 import org.eclipse.swt.widgets.Composite;
27 import org.eclipse.swt.widgets.Menu;
28
29 /**
30 * This tab demonstrates various line caps applicable to a line.
31 */
32 public class LineCapTab extends GraphicsTab {
33
34 Button colorButton;
35 GraphicsBackground foreground;
36 Menu menu;
37
LineCapTab(GraphicsExample example)38 public LineCapTab(GraphicsExample example) {
39 super(example);
40 }
41
42 @Override
getCategory()43 public String getCategory() {
44 return GraphicsExample.getResourceString("Lines"); //$NON-NLS-1$
45 }
46
47 @Override
getText()48 public String getText() {
49 return GraphicsExample.getResourceString("LineCap"); //$NON-NLS-1$
50 }
51
52 @Override
getDescription()53 public String getDescription() {
54 return GraphicsExample.getResourceString("LineCapDescription"); //$NON-NLS-1$
55 }
56
57 @Override
dispose()58 public void dispose() {
59 if (menu != null) {
60 menu.dispose();
61 menu = null;
62 }
63 }
64
65 @Override
createControlPanel(Composite parent)66 public void createControlPanel(Composite parent) {
67
68 Composite comp;
69
70 // create color button
71 comp = new Composite(parent, SWT.NONE);
72 comp.setLayout(new GridLayout());
73
74 ColorMenu cm = new ColorMenu();
75 cm.setPatternItems(example.checkAdvancedGraphics());
76 menu = cm.createMenu(parent.getParent(), gb -> {
77 foreground = gb;
78 colorButton.setImage(gb.getThumbNail());
79 example.redraw();
80 });
81
82 // initialize the foreground to the 3rd item in the menu (red)
83 foreground = (GraphicsBackground)menu.getItem(2).getData();
84
85 // color button
86 colorButton = new Button(comp, SWT.PUSH);
87 colorButton.setText(GraphicsExample
88 .getResourceString("Color")); //$NON-NLS-1$
89 colorButton.setImage(foreground.getThumbNail());
90 colorButton.addListener(SWT.Selection, event -> {
91 final Button button = (Button) event.widget;
92 final Composite parent1 = button.getParent();
93 Rectangle bounds = button.getBounds();
94 Point point = parent1.toDisplay(new Point(bounds.x, bounds.y));
95 menu.setLocation(point.x, point.y + bounds.height);
96 menu.setVisible(true);
97 });
98 }
99
100 @Override
paint(GC gc, int width, int height)101 public void paint(GC gc, int width, int height) {
102 Device device = gc.getDevice();
103
104 // draw side lines
105 gc.setLineWidth(1);
106 gc.setLineStyle(SWT.LINE_DOT);
107 gc.setForeground(device.getSystemColor(SWT.COLOR_BLACK));
108 gc.drawLine(3*width/16, height/6, 3*width/16, 5*height/6);
109 gc.drawLine(13*width/16, height/6, 13*width/16, 5*height/6);
110 gc.setLineStyle(SWT.LINE_SOLID);
111
112 // draw labels
113 Font font = new Font(device, getPlatformFont(), 20, SWT.NORMAL);
114 gc.setFont(font);
115
116 String text = GraphicsExample.getResourceString("Flat"); //$NON-NLS-1$
117 Point size = gc.stringExtent(text);
118 gc.drawString(text, (width-size.x)/2, 3*height/12, true);
119 text = GraphicsExample.getResourceString("Square"); //$NON-NLS-1$
120 size = gc.stringExtent(text);
121 gc.drawString(text, (width-size.x)/2, 5*height/12, true);
122 text = GraphicsExample.getResourceString("Round"); //$NON-NLS-1$
123 size = gc.stringExtent(text);
124 gc.drawString(text, (width-size.x)/2, 7*height/12, true);
125 font.dispose();
126
127 Pattern pattern = null;
128 if (foreground.getBgColor1() != null) {
129 gc.setForeground(foreground.getBgColor1());
130 } else if (foreground.getBgImage() != null) {
131 pattern = new Pattern(device, foreground.getBgImage());
132 gc.setForegroundPattern(pattern);
133 }
134
135 // draw lines with caps
136 gc.setLineWidth(20);
137 gc.setLineCap(SWT.CAP_FLAT);
138 gc.drawLine(3*width/16, 2*height/6, 13*width/16, 2*height/6);
139 gc.setLineCap(SWT.CAP_SQUARE);
140 gc.drawLine(3*width/16, 3*height/6, 13*width/16, 3*height/6);
141 gc.setLineCap(SWT.CAP_ROUND);
142 gc.drawLine(3*width/16, 4*height/6, 13*width/16, 4*height/6);
143
144 if (pattern != null) pattern.dispose();
145 }
146
147 /**
148 * Returns the name of a valid font for the resident platform.
149 */
getPlatformFont()150 static String getPlatformFont() {
151 if(SWT.getPlatform() == "win32") {
152 return "Arial";
153 } else if (SWT.getPlatform() == "gtk") {
154 return "Baekmuk Batang";
155 } else {
156 return "Verdana";
157 }
158 }
159 }
160