/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.draw.tools;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.util.List;
import javax.swing.Icon;
import com.cburch.draw.actions.ModelAddAction;
import com.cburch.draw.canvas.Canvas;
import com.cburch.draw.model.CanvasModel;
import com.cburch.draw.model.CanvasObject;
import com.cburch.draw.shapes.DrawAttr;
import com.cburch.draw.shapes.LineUtil;
import com.cburch.draw.shapes.Poly;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.Location;
import com.cburch.logisim.util.Icons;
import com.cburch.logisim.util.UnmodifiableList;
public class LineTool extends AbstractTool {
private DrawingAttributeSet attrs;
private boolean active;
private Location mouseStart;
private Location mouseEnd;
private int lastMouseX;
private int lastMouseY;
public LineTool(DrawingAttributeSet attrs) {
this.attrs = attrs;
active = false;
}
@Override
public Icon getIcon() {
return Icons.getIcon("drawline.gif");
}
@Override
public Cursor getCursor(Canvas canvas) {
return Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR);
}
@Override
public List<Attribute<?>> getAttributes() {
return DrawAttr.ATTRS_STROKE;
}
@Override
public void toolDeselected(Canvas canvas) {
active = false;
repaintArea(canvas);
}
@Override
public void mousePressed(Canvas canvas, MouseEvent e) {
int x = e.getX();
int y = e.getY();
int mods = e.getModifiersEx();
if ((mods & InputEvent.CTRL_DOWN_MASK) != 0) {
x = canvas.snapX(x);
y = canvas.snapY(y);
}
Location loc = Location.create(x, y);
mouseStart = loc;
mouseEnd = loc;
lastMouseX = loc.getX();
lastMouseY = loc.getY();
active = canvas.getModel() != null;
repaintArea(canvas);
}
@Override
public void mouseDragged(Canvas canvas, MouseEvent e) {
updateMouse(canvas, e.getX(), e.getY(), e.getModifiersEx());
}
@Override
public void mouseReleased(Canvas canvas, MouseEvent e) {
if (active) {
updateMouse(canvas, e.getX(), e.getY(), e.getModifiersEx());
Location start = mouseStart;
Location end = mouseEnd;
CanvasObject add = null;
if (!start.equals(end)) {
active = false;
CanvasModel model = canvas.getModel();
Location[] ends = { start, end };
List<Location> locs = UnmodifiableList.create(ends);
add = attrs.applyTo(new Poly(false, locs));
add.setValue(DrawAttr.PAINT_TYPE, DrawAttr.PAINT_STROKE);
canvas.doAction(new ModelAddAction(model, add));
repaintArea(canvas);
}
canvas.toolGestureComplete(this, add);
}
}
@Override
public void keyPressed(Canvas canvas, KeyEvent e) {
int code = e.getKeyCode();
if (active && (code == KeyEvent.VK_SHIFT || code == KeyEvent.VK_CONTROL)) {
updateMouse(canvas, lastMouseX, lastMouseY, e.getModifiersEx());
}
}
@Override
public void keyReleased(Canvas canvas, KeyEvent e) {
keyPressed(canvas, e);
}
private void updateMouse(Canvas canvas, int mx, int my, int mods) {
if (active) {
boolean shift = (mods & MouseEvent.SHIFT_DOWN_MASK) != 0;
Location newEnd;
if (shift) {
newEnd = LineUtil.snapTo8Cardinals(mouseStart, mx, my);
} else {
newEnd = Location.create(mx, my);
}
if ((mods & InputEvent.CTRL_DOWN_MASK) != 0) {
int x = newEnd.getX();
int y = newEnd.getY();
x = canvas.snapX(x);
y = canvas.snapY(y);
newEnd = Location.create(x, y);
}
if (!newEnd.equals(mouseEnd)) {
mouseEnd = newEnd;
repaintArea(canvas);
}
}
lastMouseX = mx;
lastMouseY = my;
}
private void repaintArea(Canvas canvas) {
canvas.repaint();
}
@Override
public void draw(Canvas canvas, Graphics g) {
if (active) {
Location start = mouseStart;
Location end = mouseEnd;
g.setColor(Color.GRAY);
g.drawLine(start.getX(), start.getY(), end.getX(), end.getY());
}
}
static Location snapTo4Cardinals(Location from, int mx, int my) {
int px = from.getX();
int py = from.getY();
if (mx != px && my != py) {
if (Math.abs(my - py) < Math.abs(mx - px)) {
return Location.create(mx, py);
} else {
return Location.create(px, my);
}
}
return Location.create(mx, my); // should never happen
}
}