/* 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 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.logisim.data.Bounds;
import com.cburch.logisim.data.Location;
abstract class RectangularTool extends AbstractTool {
private boolean active;
private Location dragStart;
private int lastMouseX;
private int lastMouseY;
private Bounds currentBounds;
public RectangularTool() {
active = false;
currentBounds = Bounds.EMPTY_BOUNDS;
}
public abstract CanvasObject createShape(int x, int y, int w, int h);
public abstract void drawShape(Graphics g, int x, int y, int w, int h);
public abstract void fillShape(Graphics g, int x, int y, int w, int h);
@Override
public Cursor getCursor(Canvas canvas) {
return Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR);
}
@Override
public void toolDeselected(Canvas canvas) {
Bounds bds = currentBounds;
active = false;
repaintArea(canvas, bds);
}
@Override
public void mousePressed(Canvas canvas, MouseEvent e) {
Location loc = Location.create(e.getX(), e.getY());
Bounds bds = Bounds.create(loc);
dragStart = loc;
lastMouseX = loc.getX();
lastMouseY = loc.getY();
active = canvas.getModel() != null;
repaintArea(canvas, bds);
}
@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) {
Bounds oldBounds = currentBounds;
Bounds bds = computeBounds(canvas, e.getX(), e.getY(), e.getModifiersEx());
currentBounds = Bounds.EMPTY_BOUNDS;
active = false;
CanvasObject add = null;
if (bds.getWidth() != 0 && bds.getHeight() != 0) {
CanvasModel model = canvas.getModel();
add = createShape(bds.getX(), bds.getY(),
bds.getWidth(), bds.getHeight());
canvas.doAction(new ModelAddAction(model, add));
repaintArea(canvas, oldBounds.add(bds));
}
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_ALT
|| 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) {
Bounds oldBounds = currentBounds;
Bounds bds = computeBounds(canvas, mx, my, mods);
if (!bds.equals(oldBounds)) {
currentBounds = bds;
repaintArea(canvas, oldBounds.add(bds));
}
}
private Bounds computeBounds(Canvas canvas, int mx, int my, int mods) {
lastMouseX = mx;
lastMouseY = my;
if (!active) {
return Bounds.EMPTY_BOUNDS;
} else {
Location start = dragStart;
int x0 = start.getX();
int y0 = start.getY();
int x1 = mx;
int y1 = my;
if (x0 == x1 && y0 == y1) {
return Bounds.EMPTY_BOUNDS;
}
boolean ctrlDown = (mods & InputEvent.CTRL_DOWN_MASK) != 0;
if (ctrlDown) {
x0 = canvas.snapX(x0);
y0 = canvas.snapY(y0);
x1 = canvas.snapX(x1);
y1 = canvas.snapY(y1);
}
boolean altDown = (mods & InputEvent.ALT_DOWN_MASK) != 0;
boolean shiftDown = (mods & InputEvent.SHIFT_DOWN_MASK) != 0;
if (altDown) {
if (shiftDown) {
int r = Math.min(Math.abs(x0 - x1), Math.abs(y0 - y1));
x1 = x0 + r;
y1 = y0 + r;
x0 -= r;
y0 -= r;
} else {
x0 = x0 - (x1 - x0);
y0 = y0 - (y1 - y0);
}
} else {
if (shiftDown) {
int r = Math.min(Math.abs(x0 - x1), Math.abs(y0 - y1));
y1 = y1 < y0 ? y0 - r : y0 + r;
x1 = x1 < x0 ? x0 - r : x0 + r;
}
}
int x = x0;
int y = y0;
int w = x1 - x0;
int h = y1 - y0;
if (w < 0) {
x = x1;
w = -w;
}
if (h < 0) {
y = y1;
h = -h;
}
return Bounds.create(x, y, w, h);
}
}
private void repaintArea(Canvas canvas, Bounds bds) {
canvas.repaint();
}
@Override
public void draw(Canvas canvas, Graphics g) {
Bounds bds = currentBounds;
if (active && bds != null && bds != Bounds.EMPTY_BOUNDS) {
g.setColor(Color.GRAY);
drawShape(g, bds.getX(), bds.getY(), bds.getWidth(), bds.getHeight());
}
}
}