/* 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.Graphics2D;
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.shapes.Curve;
import com.cburch.draw.shapes.CurveUtil;
import com.cburch.draw.shapes.DrawAttr;
import com.cburch.draw.shapes.LineUtil;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.Location;
import com.cburch.logisim.util.Icons;
public class CurveTool extends AbstractTool {
private static final int BEFORE_CREATION = 0;
private static final int ENDPOINT_DRAG = 1;
private static final int CONTROL_DRAG = 2;
private DrawingAttributeSet attrs;
private int state;
private Location end0;
private Location end1;
private Curve curCurve;
private boolean mouseDown;
private int lastMouseX;
private int lastMouseY;
public CurveTool(DrawingAttributeSet attrs) {
this.attrs = attrs;
state = BEFORE_CREATION;
mouseDown = false;
}
@Override
public Icon getIcon() {
return Icons.getIcon("drawcurv.svg");
}
@Override
public Cursor getCursor(Canvas canvas) {
return Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR);
}
@Override
public void toolDeselected(Canvas canvas) {
state = BEFORE_CREATION;
repaintArea(canvas);
}
@Override
public void mousePressed(Canvas canvas, MouseEvent e) {
int mx = e.getX();
int my = e.getY();
lastMouseX = mx;
lastMouseY = my;
mouseDown = true;
int mods = e.getModifiersEx();
if ((mods & InputEvent.CTRL_DOWN_MASK) != 0) {
mx = canvas.snapX(mx);
my = canvas.snapY(my);
}
switch (state) {
case BEFORE_CREATION:
case CONTROL_DRAG:
end0 = Location.create(mx, my);
end1 = end0;
state = ENDPOINT_DRAG;
break;
case ENDPOINT_DRAG:
curCurve = new Curve(end0, end1, Location.create(mx, my));
state = CONTROL_DRAG;
break;
default:
break;
}
repaintArea(canvas);
}
@Override
public void mouseDragged(Canvas canvas, MouseEvent e) {
updateMouse(canvas, e.getX(), e.getY(), e.getModifiersEx());
repaintArea(canvas);
}
@Override
public void mouseReleased(Canvas canvas, MouseEvent e) {
Curve c = updateMouse(canvas, e.getX(), e.getY(), e.getModifiersEx());
mouseDown = false;
if (state == CONTROL_DRAG) {
if (c != null) {
attrs.applyTo(c);
CanvasModel model = canvas.getModel();
canvas.doAction(new ModelAddAction(model, c));
canvas.toolGestureComplete(this, c);
}
state = BEFORE_CREATION;
}
repaintArea(canvas);
}
@Override
public void keyPressed(Canvas canvas, KeyEvent e) {
int code = e.getKeyCode();
if (mouseDown && (code == KeyEvent.VK_SHIFT
|| code == KeyEvent.VK_CONTROL || code == KeyEvent.VK_ALT)) {
updateMouse(canvas, lastMouseX, lastMouseY, e.getModifiersEx());
repaintArea(canvas);
}
}
@Override
public void keyReleased(Canvas canvas, KeyEvent e) {
keyPressed(canvas, e);
}
@Override
public void keyTyped(Canvas canvas, KeyEvent e) {
char ch = e.getKeyChar();
// escape key
if (ch == '\u001b') {
state = BEFORE_CREATION;
repaintArea(canvas);
canvas.toolGestureComplete(this, null);
}
}
private Curve updateMouse(Canvas canvas, int mx, int my, int mods) {
lastMouseX = mx;
lastMouseY = my;
boolean shiftDown = (mods & InputEvent.SHIFT_DOWN_MASK) != 0;
boolean ctrlDown = (mods & InputEvent.CTRL_DOWN_MASK) != 0;
boolean altDown = (mods & InputEvent.ALT_DOWN_MASK) != 0;
Curve ret = null;
switch (state) {
case ENDPOINT_DRAG:
if (mouseDown) {
if (shiftDown) {
Location p = LineUtil.snapTo8Cardinals(end0, mx, my);
mx = p.getX();
my = p.getY();
}
if (ctrlDown) {
mx = canvas.snapX(mx);
my = canvas.snapY(my);
}
end1 = Location.create(mx, my);
}
break;
case CONTROL_DRAG:
if (mouseDown) {
int cx = mx;
int cy = my;
if (ctrlDown) {
cx = canvas.snapX(cx);
cy = canvas.snapY(cy);
}
if (shiftDown) {
double x0 = end0.getX();
double y0 = end0.getY();
double x1 = end1.getX();
double y1 = end1.getY();
double midx = (x0 + x1) / 2;
double midy = (y0 + y1) / 2;
double dx = x1 - x0;
double dy = y1 - y0;
double[] p = LineUtil.nearestPointInfinite(cx, cy,
midx, midy, midx - dy, midy + dx);
cx = (int) Math.round(p[0]);
cy = (int) Math.round(p[1]);
}
if (altDown) {
double[] e0 = { end0.getX(), end0.getY() };
double[] e1 = { end1.getX(), end1.getY() };
double[] mid = { cx, cy };
double[] ct = CurveUtil.interpolate(e0, e1, mid);
cx = (int) Math.round(ct[0]);
cy = (int) Math.round(ct[1]);
}
ret = new Curve(end0, end1, Location.create(cx, cy));
curCurve = ret;
}
break;
default:
break;
}
return ret;
}
private void repaintArea(Canvas canvas) {
canvas.repaint();
}
@Override
public List<Attribute<?>> getAttributes() {
return DrawAttr.getFillAttributes(attrs.getValue(DrawAttr.PAINT_TYPE));
}
@Override
public void draw(Canvas canvas, Graphics g) {
g.setColor(Color.GRAY);
switch (state) {
case ENDPOINT_DRAG:
g.drawLine(end0.getX(), end0.getY(), end1.getX(), end1.getY());
break;
case CONTROL_DRAG:
((Graphics2D) g).draw(curCurve.getCurve2D());
break;
default:
break;
}
}
}