vb.net qr code reader free Run the application now, as shown in Figure 75 in VS .NET

Decoding QR-Code in VS .NET Run the application now, as shown in Figure 75

Run the application now, as shown in Figure 75
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Figure 75 The circles application When the user clicks the Browse button, the program reads in the + document and interprets the XML there, displaying the resulting figures in the application's window, as shown in Figure 76
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Figure 76 Displaying the contents of an XML document graphically Our circles application is a success; now we're depicting the contents of XML documents graphically The code for this example, circlesjava, appears in Listing 75, and the XML document it reads in, +, appears in Listing 76 Listing 75 circlesjava import commsxmlParseException;
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import commsxmlDocument;
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import commsxmlElement;
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public class circles extends Applet{
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Button button1;
String filename = null;
int numberFigures = 0;
int x[] = new int[100];
int y[] = new int[100];
int width[] = new int[100];
int height[] = new int[100];
public static void main(String args[])
circlesFrame frame = new circlesFrame("The circles application");
frameshow();
framehide();
frameresize(400, 400);
circles applet_app = new circles();
frameadd("Center", applet_app);
applet_appinit();
applet_appstart();
frameshow();
public void init(){
button1 = new Button("Browse");
add(button1);
public boolean action (Event e, Object o){
URL url = null;
String filename;
filename = "file:////c://xml//circles//circlesxml";
try {
url = new URL(filename);
} catch (MalformedURLException e1) {
Systemoutprintln("Cannot create URL for: " + filename);
Systemexit(0);
Document d = new Document();
try {
dload(url);
catch (ParseException e3) {
dreportError(e3, Systemout);
if (d != null) {
doTree(dgetRoot());
repaint();
return true;
void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
if(elem2getTagName()equals("CIRCLE")){
x[numberFigures] =
IntegerparseInt(elem2getAttribute("X"));
y[numberFigures] =
IntegerparseInt(elem2getAttribute("Y"));
width[numberFigures] =
2 * IntegerparseInt(elem2getAttribute ("RADIUS"));
height[numberFigures] =
2 * IntegerparseInt(elem2getAttribute ("RADIUS"));
numberFigures++;
repaint();
if(elem2getTagName()equals("ELLIPSE")){
x[numberFigures] =
IntegerparseInt(elem2getAttribute("X"));
y[numberFigures] =
IntegerparseInt(elem2getAttribute("Y"));
width[numberFigures] =
IntegerparseInt(elem2getAttribute ("WIDTH"));
height[numberFigures] =
IntegerparseInt(elem2getAttribute ("HEIGHT"));
numberFigures++;
repaint();
doTree(elem2);
public void paint(Graphics g)
for(int index = 0; index < numberFigures; index++){
gdrawOval(x[index], y[index], width[index], height [index]);
class circlesFrame extends Frame
public circlesFrame(String str)
super (str);
public boolean handleEvent(Event evt)
switch (evtid)
case EventWINDOW_DESTROY:
dispose();
Systemexit(0);
return true;
default:
return superhandleEvent(evt);
Listing 76 + < XML version = "10" >
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (CIRCLE|ELLIPSE)*>
<!ELEMENT CIRCLE EMPTY>
<!ELEMENT ELLIPSE EMPTY>
<!ATTLIST CIRCLE
X CDATA #IMPLIED
Y CDATA #IMPLIED
RADIUS CDATA #IMPLIED>
<!ATTLIST ELLIPSE
X CDATA #IMPLIED
Y CDATA #IMPLIED
WIDTH CDATA #IMPLIED
HEIGHT CDATA #IMPLIED>
<DOCUMENT>
<CIRCLE X="100" Y="100" RADIUS="25">
<CIRCLE X="200" Y="160" RADIUS="50">
<CIRCLE X="170" Y="100" RADIUS="15">
<ELLIPSE X="150" Y="100" WIDTH="100" HEIGHT="50">
<ELLIPSE X="220" Y="130" WIDTH="100" HEIGHT="50">
<ELLIPSE X="60" Y="240" WIDTH="80" HEIGHT="100">
</DOCUMENT>
We've seen one graphically oriented example; now we'll turn to another to see how to create other types of graphical figures: lines and rectangles
The lines Example
In the next example, we'll expand our graphics capability by seeing how to draw lines and rectangles Here, we will read in a new XML document named +; in this document, we store the data we'll need to draw lines and rectangles In Java, both those figures are drawn using two points[md]a start point, (x1, y1), and an end point (x2, y2): We'll specify lines with a new <LINE> tag and rectangles with the <RECTANGLE> tag like this in the + document Note that we store the X1, Y1, X2, and Y2 data we need as attributes of these tags: < XML version = "10" >
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (LINE|RECTANGLE)*>
<!ELEMENT LINE EMPTY>
<!ELEMENT RECTANGLE EMPTY>
<!ATTLIST LINE
X1 CDATA #IMPLIED
Y1 CDATA #IMPLIED
X2 CDATA #IMPLIED
Y2 CDATA #IMPLIED>
<!ATTLIST RECTANGLE
X1 CDATA #IMPLIED
Y1 CDATA #IMPLIED
X2 CDATA #IMPLIED
Y2 CDATA #IMPLIED>
<DOCUMENT>
<LINE X1="100" Y1="100" X2="50" Y2="70">
<LINE X1="200" Y1="160" X2="100" Y2="30">
<LINE X1="170" Y1="100" X2="30" Y2="300">
<RECTANGLE X1="150" Y1="100" X2="100" Y2="50">
<RECTANGLE X1="220" Y1="130" X2="100" Y2="50">
<RECTANGLE X1="60" Y1="240" X2="80" Y2="100">
</DOCUMENT>
When the user starts this program, we'll present the user with a Browse button: When the user clicks the Browse button, we read in the + document and display the lines and rectangles in the application's window: We start the linesjava application by creating a window, the applet we'll need, and the button we'll use: import javaawt*;
import javaappletApplet;
public class lines extends Applet{
Button button1;
public static void main(String args[])
linesFrame frame = new linesFrame("The lines application");
frameshow();
framehide();
frameresize(400, 400);
lines applet = new lines();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
public void init(){
button1 = new Button("Browse");
add(button1);
When the user clicks the button, we read in the linesxml file and call the recursive method doTree(): public boolean action (Event e, Object o){
URL url = null;
filename = "file:////c://xml//lines//linesxml";
try {
url = new URL(filename);
} catch (MalformedURLException e1) {
Systemoutprintln("Cannot create URL for: " + filename);
Systemexit(0);
Document d = new Document();
try {
dload(url);
catch (ParseException e3) {
dreportError(e3, Systemout);
if (d != null) {
doTree(dgetRoot());
repaint();
return true;
We will write the doTree() method now In that method, we will store the data we need to draw lines in a two-dimensional array named lines[][] and the data we need to draw rectangles in a two dimensional array named rectangles[][] We also store the total number of lines in the new integer numberLines and the total number of rectangles in the new integer numberRectangles: public class lines extends Applet{
Button button1;
String filename;
int numberLines = 0, numberRectangles = 0;
int lines[][] = new int[100][4];
int rectangles[][] = new int[100][4];
Now in doTree(), we can loop over the children of the element passed to us, first checking to make sure the current child is of type ElementELEMENT: void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
With the getTagName() method, we can check to see whether the current element is a <LINE> element: void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
if(elem2getTagName()equals("LINE")){
If this is a <LINE> element, we store the (x1, y1) and (x2, y2) data from the <LINE> element's attributes in the lines[][] array Note that we also increment the total number of lines to draw, numberLines: void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
if(elem2getTagName()equals("LINE")){
lines[numberLines][0] =
IntegerparseInt(elem2getAttribute("X1"));
lines[numberLines][1] =
IntegerparseInt(elem2getAttribute("Y1"));
lines[numberLines][2] =
IntegerparseInt(elem2getAttribute("X2"));
lines[numberLines][3] =
IntegerparseInt(elem2getAttribute("Y2"));
numberLines++;
repaint();
If the current element is not a <LINE> element, we check to see whether it's a <RECTANGLE> element: void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
if(elem2getTagName()equals("LINE")){
lines[numberLines][0] =
IntegerparseInt(elem2getAttribute("X1"));
lines[numberLines][1] =
IntegerparseInt(elem2getAttribute("Y1"));
lines[numberLines][2] =
IntegerparseInt(elem2getAttribute("X2"));
lines[numberLines][3] =
IntegerparseInt(elem2getAttribute("Y2"));
numberLines++;
repaint();
if(elem2getTagName()equals("RECTANGLE")){
We will store the data we need to draw the rectangle in the rectangles[][] array and increment the total number of rectangles to draw, numberRectangles, this way: void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
if(elem2getTagName()equals("LINE")){
lines[numberLines][0] =
IntegerparseInt(elem2getAttribute("X1"));
lines[numberLines][1] =
IntegerparseInt(elem2getAttribute("Y1"));
lines[numberLines][2] =
IntegerparseInt(elem2getAttribute("X2"));
lines[numberLines][3] =
IntegerparseInt(elem2getAttribute("Y2"));
numberLines++;
repaint();
if(elem2getTagName()equals("RECTANGLE")){
rectangles[numberRectangles][0] =
IntegerparseInt(elem2getAttribute("X1"));
rectangles[numberRectangles][1] =
IntegerparseInt(elem2getAttribute("Y1"));
rectangles[numberRectangles][2] =
IntegerparseInt(elem2getAttribute("X2"));
rectangles[numberRectangles][3] =
IntegerparseInt(elem2getAttribute("Y2"));
numberRectangles++;
repaint();
Finally, we call doTree() again to handle any child elements like this:
void doTree(Element elem)
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
if(elem2getType() == commsxmlElementELEMENT){
if(elem2getTagName()equals("LINE")){
lines[numberLines][0] =
IntegerparseInt(elem2getAttribute("X1"));
lines[numberLines][1] =
IntegerparseInt(elem2getAttribute("Y1"));
lines[numberLines][2] =
IntegerparseInt(elem2getAttribute("X2"));
lines[numberLines][3] =
IntegerparseInt(elem2getAttribute("Y2"));
numberLines++;
repaint();
if(elem2getTagName()equals("RECTANGLE")){
rectangles[numberRectangles][0] =
IntegerparseInt(elem2getAttribute("X1"));
rectangles[numberRectangles][1] =
IntegerparseInt(elem2getAttribute("Y1"));
rectangles[numberRectangles][2] =
IntegerparseInt(elem2getAttribute("X2"));
rectangles[numberRectangles][3] =
IntegerparseInt(elem2getAttribute("Y2"));
numberRectangles++;
repaint();
doTree(elem2);
All that remains is to write the paint() method to draw the lines and rectangles as directed in the linesxml document We start by looping over all the lines we are to draw: public void paint(Graphics g)
for(int index = 0; index < numberLines; index++){
We use the Java Graphics class' drawLine() method to actually draw the line We pass that method the four coordinates which we've stored to display the current line this way: public void paint(Graphics g)
for(int index = 0; index < numberLines; index++){
gdrawLine(lines[index][0], lines[index][1], lines [index][2],
lines[index][3]);
To draw the rectangles, we loop over all the rectangles we are to draw and call the Graphics class' drawRect() method: public void paint(Graphics g)
for(int index = 0; index < numberLines; index++){
gdrawLine(lines[index][0], lines[index][1], lines [index][2],
lines[index][3]);
for(int index = 0; index < numberRectangles; index++){
gdrawRect(rectangles[index][0], rectangles[index][1],
rectangles[index][2], rectangles[index][3]);
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