| /******************************************************************************* |
| * Copyright (c) 2006 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.swt.examples.graphics; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * This tab presents cubic and quadratic curves that can be drawn. |
| * The user may reposition the cubic and quadratic handles. |
| */ |
| public class CurvesTab extends GraphicsTab { |
| /** These rectangles represent the handles on the curves. */ |
| private Rectangle quadHndl, quadEndHndl, cubHndl1, cubHndl2, cubEndHndl; |
| |
| /** These values represent the positions of the curves. */ |
| private float quadXPos, quadYPos, cubXPos, cubYPos; |
| |
| /** These values represent the x and y displacement of each handle. */ |
| private float quadDiffX, quadDiffY, quadEndDiffX, quadEndDiffY; |
| private float cubDiffX1, cubDiffY1, cubDiffX2, cubDiffY2, cubEndDiffX, cubEndDiffY; |
| |
| /** These are flags that indicate whether or not a handle has been moved. */ |
| private boolean quadPtMoved, quadEndPtMoved, cubPt1Moved, cubPt2Moved, cubEndPtMoved; |
| |
| private MouseMoveListener mouseMoveListener; |
| private MouseListener mouseListener; |
| private Cursor cursor; |
| |
| /** true if hovering over a handle, false otherwise */ |
| private boolean hovering = false; |
| |
| /** true if left mouse button is held down, false otherwise */ |
| private boolean mouseDown = false; |
| |
| |
| public CurvesTab(GraphicsExample example) { |
| super(example); |
| quadHndl = new Rectangle(200, 150, 5, 5); |
| quadEndHndl = new Rectangle(400, 0, 5, 5); |
| quadDiffX = quadDiffY = quadEndDiffX = quadEndDiffY = 0; |
| cubHndl1 = new Rectangle(133, -60, 5, 5); |
| cubHndl2 = new Rectangle(266, 60, 5, 5); |
| cubDiffX1 = cubDiffY1 = cubDiffX2 = cubDiffY2 = 0; |
| cubEndHndl = new Rectangle(400, 0, 5, 5); |
| cubEndDiffX = cubEndDiffY = 0; |
| } |
| |
| public String getCategory() { |
| return GraphicsExample.getResourceString("Curves"); //$NON-NLS-1$ |
| } |
| |
| public String getText() { |
| return GraphicsExample.getResourceString("Curves"); //$NON-NLS-1$ |
| } |
| |
| public String getDescription() { |
| return GraphicsExample.getResourceString("CurvesDescription"); //$NON-NLS-1$ |
| } |
| |
| public boolean getDoubleBuffered() { |
| return true; |
| } |
| |
| public void dispose() { |
| if (mouseListener != null) |
| example.canvas.removeMouseListener(mouseListener); |
| |
| if (mouseMoveListener != null) |
| example.canvas.removeMouseMoveListener(mouseMoveListener); |
| |
| cursor = null; |
| } |
| |
| /** |
| * This helper method determines whether or not the cursor is positioned |
| * over a handle. |
| * |
| * @param e |
| * A MouseEvent |
| * @return true if cursor is positioned over a handle; false otherwise |
| */ |
| private boolean isHovering(MouseEvent e) { |
| Rectangle quad = new Rectangle(quadHndl.x + (int)quadXPos - 1, quadHndl.y + (int)quadYPos - 1, quadHndl.width+2, quadHndl.height+2); |
| Rectangle quadEnd = new Rectangle(quadEndHndl.x + (int)quadXPos - 1, quadEndHndl.y + (int)quadYPos - 1, quadEndHndl.width+2, quadEndHndl.height+2); |
| Rectangle cub1 = new Rectangle(cubHndl1.x + (int)cubXPos - 1, cubHndl1.y + (int)cubYPos - 1, cubHndl1.width+2, cubHndl1.height+2); |
| Rectangle cub2 = new Rectangle(cubHndl2.x + (int)cubXPos - 1, cubHndl2.y + (int)cubYPos - 1, cubHndl2.width+2, cubHndl2.height+2); |
| Rectangle cubEnd = new Rectangle(cubEndHndl.x + (int)cubXPos - 1, cubEndHndl.y + (int)cubYPos - 1, cubEndHndl.width+2, cubEndHndl.height+2); |
| |
| return ( quad.contains(e.x, e.y) || quadEnd.contains(e.x, e.y) |
| || cub1.contains(e.x, e.y) || cub2.contains(e.x, e.y) |
| || cubEnd.contains(e.x, e.y)); |
| } |
| /** |
| * Creates the widgets used to control the drawing. |
| */ |
| public void createControlPanel(Composite parent) { |
| if (cursor == null) { |
| cursor = parent.getDisplay().getSystemCursor(SWT.CURSOR_HAND); |
| } |
| |
| mouseMoveListener = new MouseMoveListener() { |
| |
| public void mouseMove(MouseEvent e) { |
| if (hovering && mouseDown) { |
| example.canvas.setCursor(cursor); |
| } else if (isHovering(e)) { |
| example.canvas.setCursor(cursor); |
| hovering = true; |
| } else { |
| example.canvas.setCursor(null); |
| hovering = false; |
| } |
| |
| if (quadPtMoved) { |
| quadDiffX = quadDiffX + e.x - (int)quadXPos - quadHndl.x; |
| quadDiffY = quadDiffY + e.y - (int)quadYPos - quadHndl.y; |
| quadHndl.x = e.x - (int)quadXPos; |
| quadHndl.y = e.y - (int)quadYPos; |
| } else if (quadEndPtMoved) { |
| quadEndDiffX = quadEndDiffX + e.x - (int)quadXPos - quadEndHndl.x; |
| quadEndDiffY = quadEndDiffY + e.y - (int)quadYPos - quadEndHndl.y; |
| quadEndHndl.x = e.x - (int)quadXPos; |
| quadEndHndl.y = e.y - (int)quadYPos; |
| } else if (cubPt1Moved) { |
| cubDiffX1 = cubDiffX1 + e.x - (int)cubXPos - cubHndl1.x; |
| cubDiffY1 = cubDiffY1 + e.y - (int)cubYPos - cubHndl1.y; |
| cubHndl1.x = e.x - (int)cubXPos; |
| cubHndl1.y = e.y - (int)cubYPos; |
| } else if (cubPt2Moved) { |
| cubDiffX2 = cubDiffX2 + e.x - (int)cubXPos - cubHndl2.x; |
| cubDiffY2 = cubDiffY2 + e.y - (int)cubYPos - cubHndl2.y; |
| cubHndl2.x = e.x - (int)cubXPos; |
| cubHndl2.y = e.y - (int)cubYPos; |
| } else if (cubEndPtMoved) { |
| cubEndDiffX = cubEndDiffX + e.x - (int)cubXPos - cubEndHndl.x; |
| cubEndDiffY = cubEndDiffY + e.y - (int)cubYPos - cubEndHndl.y; |
| cubEndHndl.x = e.x - (int)cubXPos; |
| cubEndHndl.y = e.y - (int)cubYPos; |
| } |
| example.redraw(); |
| } |
| }; |
| |
| mouseListener = new MouseListener() { |
| |
| public void mouseDoubleClick(MouseEvent e) {} |
| |
| /** |
| * Sent when a mouse button is pressed. |
| * |
| * @param e an event containing information about the mouse button press |
| */ |
| public void mouseDown(MouseEvent e) { |
| Rectangle quad = new Rectangle(quadHndl.x + (int)quadXPos - 1, quadHndl.y + (int)quadYPos - 1, quadHndl.width+2, quadHndl.height+2); |
| Rectangle quadEnd = new Rectangle(quadEndHndl.x + (int)quadXPos - 1, quadEndHndl.y + (int)quadYPos - 1, quadEndHndl.width+2, quadEndHndl.height+2); |
| Rectangle cub1 = new Rectangle(cubHndl1.x + (int)cubXPos - 1, cubHndl1.y + (int)cubYPos - 1, cubHndl1.width+2, cubHndl1.height+2); |
| Rectangle cub2 = new Rectangle(cubHndl2.x + (int)cubXPos - 1, cubHndl2.y + (int)cubYPos - 1, cubHndl2.width+2, cubHndl2.height+2); |
| Rectangle cubEnd = new Rectangle(cubEndHndl.x + (int)cubXPos - 1, cubEndHndl.y + (int)cubYPos - 1, cubEndHndl.width+2, cubEndHndl.height+2); |
| |
| if (quad.contains(e.x, e.y)) { |
| quadPtMoved = true; |
| mouseDown = true; |
| } else if (quadEnd.contains(e.x, e.y)) { |
| quadEndPtMoved = true; |
| mouseDown = true; |
| } else if (cub1.contains(e.x, e.y)) { |
| cubPt1Moved = true; |
| mouseDown = true; |
| } else if (cub2.contains(e.x, e.y)) { |
| cubPt2Moved = true; |
| mouseDown = true; |
| } else if (cubEnd.contains(e.x, e.y)) { |
| cubEndPtMoved = true; |
| mouseDown = true; |
| } |
| } |
| |
| /** |
| * Sent when a mouse button is released. |
| * |
| * @param e an event containing information about the mouse button release |
| */ |
| public void mouseUp(MouseEvent e) { |
| mouseDown = false; |
| if (isHovering(e)) { |
| example.canvas.setCursor(cursor); |
| } else { |
| example.canvas.setCursor(null); |
| } |
| |
| if (quadPtMoved) |
| quadPtMoved = false; |
| if (quadEndPtMoved) |
| quadEndPtMoved = false; |
| if (cubPt1Moved) |
| cubPt1Moved = false; |
| if (cubPt2Moved) |
| cubPt2Moved = false; |
| if (cubEndPtMoved) |
| cubEndPtMoved = false; |
| |
| example.redraw(); |
| } |
| }; |
| example.canvas.addMouseMoveListener(mouseMoveListener); |
| example.canvas.addMouseListener(mouseListener); |
| } |
| |
| public void paint(GC gc, int width, int height) { |
| if (!example.checkAdvancedGraphics()) return; |
| Device device = gc.getDevice(); |
| |
| Font font = new Font(device, getPlatformFont(), 16, SWT.ITALIC); |
| gc.setFont(font); |
| gc.setLineWidth(5); |
| |
| Transform transform; |
| |
| // ----- cubic curve ----- |
| cubXPos = width/5; |
| cubYPos = height/3; |
| |
| transform = new Transform(device); |
| transform.translate(cubXPos, cubYPos); |
| gc.setTransform(transform); |
| transform.dispose(); |
| |
| gc.setForeground(device.getSystemColor(SWT.COLOR_RED)); |
| gc.drawString(GraphicsExample.getResourceString("Cubic"), 25, -70, true); |
| |
| Path path = new Path(device); |
| path.cubicTo(133 + cubDiffX1, -60 + cubDiffY1, 266 + cubDiffX2, 60 + cubDiffY2, 400 + cubEndDiffX, 0 + cubEndDiffY); |
| gc.drawPath(path); |
| path.dispose(); |
| |
| gc.setTransform(null); |
| gc.setForeground(device.getSystemColor(SWT.COLOR_DARK_BLUE)); |
| gc.drawRectangle(cubHndl1.x + (int)cubXPos, cubHndl1.y + (int)cubYPos, cubHndl1.width, cubHndl1.height); |
| gc.drawRectangle(cubHndl2.x + (int)cubXPos, cubHndl2.y + (int)cubYPos, cubHndl2.width, cubHndl2.height); |
| gc.drawRectangle(cubEndHndl.x + (int)cubXPos, cubEndHndl.y + (int)cubYPos, cubEndHndl.width, cubEndHndl.height); |
| |
| // ----- quadratic curve ----- |
| quadXPos = width/5; |
| quadYPos = 2*height/3; |
| |
| transform = new Transform(device); |
| transform.translate(quadXPos, quadYPos); |
| gc.setTransform(transform); |
| transform.dispose(); |
| |
| gc.setForeground(device.getSystemColor(SWT.COLOR_GREEN)); |
| gc.drawString(GraphicsExample.getResourceString("Quadratic"), 0, -50, true); |
| |
| path = new Path(device); |
| path.quadTo(200 + quadDiffX, 150 + quadDiffY, 400 + quadEndDiffX, 0 + quadEndDiffY); |
| gc.drawPath(path); |
| path.dispose(); |
| |
| gc.setTransform(null); |
| gc.setForeground(device.getSystemColor(SWT.COLOR_GRAY)); |
| gc.drawRectangle(quadHndl.x + (int)quadXPos, quadHndl.y + (int)quadYPos, quadHndl.width, quadHndl.height); |
| gc.drawRectangle(quadEndHndl.x + (int)quadXPos, quadEndHndl.y + (int)quadYPos, quadEndHndl.width, quadEndHndl.height); |
| |
| 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() == "motif") { |
| return "Helvetica"; |
| } else if (SWT.getPlatform() == "gtk") { |
| return "Baekmuk Batang"; |
| } else if (SWT.getPlatform() == "carbon") { |
| return "Arial"; |
| } else { // photon, etc ... |
| return "Verdana"; |
| } |
| } |
| |
| } |
| |