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Draw Lines using DDA and Bresenham's Line Drawing Algorithm [CG]

February 08, 2017
Problem Statement:

 Draw Lines using DDA and Bresenham's Line Drawing Algorithm [CG]

Code:

mainwindow.cpp


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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<math.h>
#include<qpicture.h>
#include<qpainter.h>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}
int sign(float val)
{
    if(val<0)
    {
        return -1;
    }
    else if(val==0)
        return 0;
    else
        return 1;
}
void MainWindow::on_pushButton_clicked()
{

    int x1=ui->textEdit->toPlainText().toInt();
    int y1=ui->textEdit_2->toPlainText().toInt();
    int x2=ui->textEdit_3->toPlainText().toInt();
    int y2=ui->textEdit_4->toPlainText().toInt();
    QPicture pic;
    QPainter paint;
    paint.begin(&pic);
    QBrush brush;
    brush.setColor(Qt::yellow);
    paint.setBrush(brush);
    paint.setPen(Qt::red);
    paint.drawLine(QPoint(150,0),QPoint(150,300));
    paint.drawLine(QPoint(0,150),QPoint(300,150));
   /* for(int j=0;j<300;j++)
    {
        paint.drawPoint(150,j);
        paint.drawPoint(j,150);
    }
    */
    int s1,s2,interchange,x,y,i;
    float dx,dy,e;
    dx=abs(x2-x1);
    dy=abs(y2-y1);
    x=x1;
    y=y1;
    s1=sign(x2-x1);
    s2=sign(y2-y1);

    if(dx<dy)
    {
        float temp=dx;
        dx=dy;
        dy=temp;
        interchange=1;
    }
    else
        interchange=0;
    i=1;
    e=2*dy-dx;
    while(i<=dx)
    {
        paint.drawPoint(150+x,150-y);
        if(i==1)
        {

            QString sx=QString::number(x);
            QString sy=QString::number(y);
            sx="("+sx+" , "+sy+")";
            paint.drawText(QPoint(150+x+10,150-y+10),sx);
        }
        while(e>0)
        {
            if(interchange==1)
            {
                x=x+s1;
            }
            else
            {
                y=y+s2;
            }
            e=e-2*dx;
        }
        if(interchange==1)
        {
            y=y+s2;
        }
        else
        {
            x=x+s1;
        }
        e=e+2*dy;
        i++;
    }
    QString sx=QString::number(x);
    QString sy=QString::number(y);
    sx="("+sx+" , "+sy+")";
    paint.drawText(QPoint(150+x+10,150-y+10),sx);

    paint.end();
    ui->label_5->setPicture(pic);

}



void MainWindow::on_pushButton_2_clicked()
{
    int x1=ui->textEdit->toPlainText().toInt();
    int y1=ui->textEdit_2->toPlainText().toInt();
    int x2=ui->textEdit_3->toPlainText().toInt();
    int y2=ui->textEdit_4->toPlainText().toInt();
    QPicture pic;
    QPainter paint;
    paint.begin(&pic);
    paint.drawLine(QPoint(150,0),QPoint(150,300));
    paint.drawLine(QPoint(0,150),QPoint(300,150));

    int dx=(x2-x1);
    int dy=(y2-y1);
    int length;
    float x,y;
    if(abs(dx)>=abs(dy))
        length=abs(dx);
    else
        length=abs(dy);

    float xinc=dx/float(length);
    float yinc=dy/float(length);

    x=x1;
    y=y1;

    QString sx=QString::number(x);
    QString sy=QString::number(y);
    sx="("+sx+" , "+sy+")";
    paint.drawText(QPoint(150+x+10,150-y+10),sx);

    int i=1;
    while(i<=length)
    {
       // float ty=(y);
paint.drawPoint(round(x)+150,150-round(y));
      //  img.setPixel(round(x)+150,150-round(y),qRgb(128,15,45));
        x=x+xinc;
        y=y+yinc;
        i++;
    }
   sx=QString::number(round(x));
   sy=QString::number(round(y));
    sx="("+sx+" , "+sy+")";
    paint.drawText(QPoint(150+x+10,150-y+10),sx);
    paint.end();
       ui->label_5->setPicture(pic);
}


mainwindow.ui


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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>712</width>
    <height>453</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QLabel" name="label_2">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>100</y>
      <width>31</width>
      <height>21</height>
     </rect>
    </property>
    <property name="text">
     <string>X2</string>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit_2">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>70</y>
      <width>104</width>
      <height>21</height>
     </rect>
    </property>
   </widget>
   <widget class="QLabel" name="label_5">
    <property name="geometry">
     <rect>
      <x>180</x>
      <y>20</y>
      <width>450</width>
      <height>350</height>
     </rect>
    </property>
    <property name="text">
     <string/>
    </property>
   </widget>
   <widget class="QLabel" name="label">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>40</y>
      <width>31</width>
      <height>21</height>
     </rect>
    </property>
    <property name="text">
     <string>X1</string>
    </property>
   </widget>
   <widget class="QLabel" name="label_3">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>70</y>
      <width>31</width>
      <height>21</height>
     </rect>
    </property>
    <property name="text">
     <string>Y1</string>
    </property>
   </widget>
   <widget class="QLabel" name="label_4">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>130</y>
      <width>31</width>
      <height>21</height>
     </rect>
    </property>
    <property name="text">
     <string>Y2</string>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit_3">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>100</y>
      <width>104</width>
      <height>21</height>
     </rect>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>170</y>
      <width>97</width>
      <height>31</height>
     </rect>
    </property>
    <property name="text">
     <string>Bresenham</string>
    </property>
    <property name="checkable">
     <bool>false</bool>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit_4">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>130</y>
      <width>104</width>
      <height>21</height>
     </rect>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>40</y>
      <width>104</width>
      <height>21</height>
     </rect>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton_2">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>220</y>
      <width>97</width>
      <height>31</height>
     </rect>
    </property>
    <property name="text">
     <string>DDA</string>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>712</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

Output:-
Bresenhams Output

DDA's Output
Tags :

2 comments:

  1. Unknown29 March 2017 at 21:27

    Can you upload rest of the CGs code?

    ReplyDelete
    Replies
    1. Vaibhav Kumbhar30 March 2017 at 19:34

      sorry . I have not completed those. Will Upload as soon as possible. In this week.

      Delete

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