curvesview.java

java windows application to draw bezier curves

            this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
            this.drawPoints();
            this.drawOpen();
        } else {
            this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
            this.drawPoints();
            this.drawClose();
        }
    }//GEN-LAST:event_jButton1MouseClicked

    private void mainPanelMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_mainPanelMouseClicked
        // TODO add your handling code here:
        Point p1 = new Point(evt.getX(), evt.getY());
        Graphics g = mainPanel.getGraphics();
        switch (evt.getButton()) {

            case MouseEvent.BUTTON1: {
                if (this.selected == -1) {
                    pointList.add(p1);
                    if (_open) {
                        this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                        this.drawPoints();
                        this.drawOpen();
                    } else {
                        this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                        this.drawPoints();
                        this.drawClose();
                    }
                } else {
                    pointList.setElementAt(p1, selected);
                    if (_open) {
                        this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                        this.drawPoints();
                        this.drawOpen();
                    } else {
                        this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                        this.drawPoints();
                        this.drawClose();
                    }

                }

                break;
            }
            case MouseEvent.BUTTON3: {
                this.selectPoint(p1);
                if (this.selected != -1) {
                    p1 = pointList.elementAt(this.selected);

                    g.setColor(Color.red);
                    g.fillArc(p1.x - 5, p1.y - 5, 10, 10, 0, 360);
                }

                break;
            }
        }

//        g.fillRect(p1.x, p1.y, 8, 8);

    }//GEN-LAST:event_mainPanelMouseClicked

    private void jButton3MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton3MouseClicked
        // TODO add your handling code here:
        this.mainPanel.repaint();
        pointList.clear();
        selected = -1;
    }//GEN-LAST:event_jButton3MouseClicked

    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton2MouseClicked
        // TODO add your handling code here:
        if (_open) {
            this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
            this.drawPoints();
            this.drawClose();
            _open = false;
            jButton2.setText("Open");
        } else {
            this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
            this.drawPoints();
            this.drawOpen();
            _open = true;
            jButton2.setText("Close");
        }


    }//GEN-LAST:event_jButton2MouseClicked

    private void mainPanelKeyPressed(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_mainPanelKeyPressed
        // TODO add your handling code here:
    }//GEN-LAST:event_mainPanelKeyPressed

    private void mainPanelKeyTyped(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_mainPanelKeyTyped
        // TODO add your handling code here:
    }//GEN-LAST:event_mainPanelKeyTyped

    private void deleteButtonMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_deleteButtonMouseClicked
        // TODO add your handling code here:
        if (selected != -1) {
            pointList.remove(selected);
            selected = -1;
            if (_open) {
                this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                this.drawPoints();
                this.drawOpen();
            } else {
                this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                this.drawPoints();
                this.drawClose();
            }
        }
}//GEN-LAST:event_deleteButtonMouseClicked

    private void mainPanelMouseDragged(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_mainPanelMouseDragged
        // TODO add your handling code here:
        
            Point p1 = new Point(evt.getX(), evt.getY());
        Graphics g = mainPanel.getGraphics();
        if (this.selected == -1) {
        } else {
            pointList.setElementAt(p1, selected);
            if (_open) {
                this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                this.drawPoints();
                this.drawOpen();
            } else {
                this.mainPanel.getGraphics().clearRect(0, 0, 1000, 430);
                this.drawPoints();
                this.drawClose();
            }


        }
        
        
    }//GEN-LAST:event_mainPanelMouseDragged

    private void mainPanelMouseMoved(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_mainPanelMouseMoved
        // TODO add your handling code here:
    }//GEN-LAST:event_mainPanelMouseMoved

    private void mainPanelMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_mainPanelMouseReleased
        // TODO add your handling code here:
    }//GEN-LAST:event_mainPanelMouseReleased

    private void drawOpen() {
        Graphics g = this.mainPanel.getGraphics();
        if (pointList.size() < 4) {
        } else {
            Point p1, p2, p3, p4;
            p1 = pointList.elementAt(0);
            p2 = pointList.elementAt(0);
            p3 = pointList.elementAt(1);
            p4 = pointList.elementAt(2);
            this.drawCurve(p1, p2, p3, p4);
            int index = 3;
            p1 = pointList.elementAt(0);
            p2 = pointList.elementAt(1);
            p3 = pointList.elementAt(2);
            p4 = pointList.elementAt(3);
            this.drawCurve(p1, p2, p3, p4);
            index++;
            while (pointList.size() > index) {
                p1 = pointList.elementAt(index - 3);
                p2 = pointList.elementAt(index - 2);
                p3 = pointList.elementAt(index - 1);
                p4 = pointList.elementAt(index);
                this.drawCurve(p1, p2, p3, p4);
                index++;
            }
            p1 = pointList.elementAt(index - 3);
                p2 = pointList.elementAt(index - 2);
                p3 = pointList.elementAt(index - 1);
                p4 = pointList.elementAt(index-1);
                this.drawCurve(p1, p2, p3, p4);
        }

    }

    private void drawClose() {
        Graphics g = this.mainPanel.getGraphics();
        if (pointList.size() < 4) {
        } else {
            Point p1, p2, p3, p4;
            int index = 3;
            p1 = pointList.elementAt(0);
            p2 = pointList.elementAt(1);
            p3 = pointList.elementAt(2);
            p4 = pointList.elementAt(3);
            this.drawCurve(p1, p2, p3, p4);
            index++;
            while (pointList.size() > index) {
                p1 = pointList.elementAt(index - 3);
                p2 = pointList.elementAt(index - 2);
                p3 = pointList.elementAt(index - 1);
                p4 = pointList.elementAt(index);
                this.drawCurve(p1, p2, p3, p4);
                index++;
            }
            p1 = pointList.elementAt(index - 3);
            p2 = pointList.elementAt(index - 2);
            p3 = pointList.elementAt(index - 1);
            p4 = pointList.elementAt(0);
            this.drawCurve(p1, p2, p3, p4);
            p1 = pointList.elementAt(index - 2);
            p2 = pointList.elementAt(index - 1);
            p3 = pointList.elementAt(0);
            p4 = pointList.elementAt(1);
            this.drawCurve(p1, p2, p3, p4);
            p1 = pointList.elementAt(index - 1);
            p2 = pointList.elementAt(0);
            p3 = pointList.elementAt(1);
            p4 = pointList.elementAt(2);
            this.drawCurve(p1, p2, p3, p4);
        }

    }

    public void drawCurve(Point p1, Point p2, Point p3, Point p4) {
        Graphics g = this.mainPanel.getGraphics();
        double t = 0;
        double x, y;
        int[] xs = new int[1000];
        int[] ys = new int[1000];
        int indx = 1;
        xs[0] = p2.x;
        ys[0] = p2.y;
        while (t < 1) {
            t += 0.02;
            x = 0.5 * ((2 * p2.x) + (-p1.x + p3.x) * t + (2 * p1.x - 5 * p2.x + 4 * p3.x - p4.x) * t * t + (-p1.x + 3 * p2.x - 3 * p3.x + p4.x) * t * t * t);
            y = 0.5 * ((2 * p2.y) + (-p1.y + p3.y) * t + (2 * p1.y - 5 * p2.y + 4 * p3.y - p4.y) * t * t + (-p1.y + 3 * p2.y - 3 * p3.y + p4.y) * t * t * t);
            xs[indx] = (int) x;
            ys[indx] = (int) y;
            indx++;
        }

        xs[indx] = p3.x;
        ys[indx++] = p3.y;
        g.drawPolyline(xs, ys, indx);
    }

    private void drawPoints() {
        Graphics g = mainPanel.getGraphics();
        Point p1;
        for (int i = 0; i < pointList.size(); i++) {
            p1 = pointList.elementAt(i);
            g.drawString("p" + i + ":" + String.valueOf(p1.x) + "," + String.valueOf(p1.y), 10, 10 + i * 15);
            g.fillArc(p1.x - 5, p1.y - 5, 10, 10, 0, 360);
        }
        if (this.selected != -1) {
            p1 = pointList.elementAt(this.selected);

            g.setColor(Color.red);
            g.fillArc(p1.x - 5, p1.y - 5, 10, 10, 0, 360);
        }

    }

    private void selectPoint(Point p) {
        Point p1;
        for (int i = 0; i < pointList.size(); i++) {
            if (Math.abs(p.x - pointList.elementAt(i).x) < 4 && Math.abs(p.y - pointList.elementAt(i).y) < 4) {
                if (this.selected != -1) {
                    p1 = pointList.elementAt(this.selected);
                    Graphics g = mainPanel.getGraphics();
                    g.fillArc(p1.x - 5, p1.y - 5, 10, 10, 0, 360);
                }
                selected = i;
                return;
            }
        }

        if (this.selected != -1) {
            p1 = pointList.elementAt(this.selected);
            Graphics g = mainPanel.getGraphics();
            g.fillArc(p1.x - 5, p1.y - 5, 10, 10, 0, 360);
        }
        selected = -1;
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton deleteButton;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JPanel mainPanel;
    private javax.swing.JMenuBar menuBar;
    private javax.swing.JProgressBar progressBar;
    private javax.swing.JLabel statusAnimationLabel;
    private javax.swing.JLabel statusMessageLabel;
    private javax.swing.JPanel statusPanel;
    // End of variables declaration//GEN-END:variables
    private Vector<Point> pointList = new Vector<Point>();
    private final Timer messageTimer;
    private final Timer busyIconTimer;
    private final Icon idleIcon;
    private final Icon[] busyIcons = new Icon[15];
    private int busyIconIndex = 0;
    private JDialog aboutBox;
    private boolean _open = true;
    private int selected = -1;
    private boolean dragged = false;
}