View source for QCad/C2/Modification-Tools-to-Stretch-and-Mirror/English

'''Title of script''': Qcad-Modification Tools – Stretch and Mirror

'''Author: Leena Mulye'''

'''Keywords: QCAD, Scale, Stretch, Mirror, array, rotate'''


[http://spoken-tutorial.org/wiki/index.php/File:Qcad4-stretch-mirror.zip‎‎ Click here for slides]



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| style="border-top:0.092cm double #808080;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| <center>'''Visual Cue '''</center>
| style="border:0.092cm double #808080;padding:0.049cm;"| <center>'''Narration '''</center>

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| slide 1 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| Hello and welcome to this spoken tutorial on Using

Modification Tools to Stretch and Mirror in QCAD 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 2 

Lesson Plan 
| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| In this tutorial we will learn how to 

* Stretch

* Mirror 

in QCAD. 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 3 
| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| For this tutorial, I am using GNU Linux operating system Ubuntu Version 10.04 LTS 

and QCAD Community Edition Version 2.0.5.0 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to QCAD application window 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| I assume that you know how to use Qcad, If not then please refer to our earlier tutorials available on spoken-tutorial site.

We will now see the Stretch tool 

Open QCAD application. 

In my QCAD application, I have set the units to meters, and grid size to 0.25x0.25. 

Let's draw a rectangle. 

To do this -> go to line tool and click on rectangle icon. 

Choose snap to grid option and left click on the grid for first corner and 

second click to complete rectangle. 

Zoom in using middle mouse button if grid is too small. 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Stretch Tool 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| We will stretch this rectangle that we have drawn here. 

Go to Modify->stretch or 

from left tool bar, 

<p style="color:blue">Click on edit and click on stretch icon. (In video: hover over stretch icon, next to scissors)</p>


You will need to specify first corner and second corner, area from where stretch should apply. 

I am using snap to grid. 

However, you can use suitable snapping options. 

To select first corner, move mouse cross hair over that area and left click to select it. 

Similarly using mouse again hover over second area and left click to select. 

Reference point is asked, with respect to which it will start the stretch. 

I want to start it from top right corner. That is why I am using intersection of this point. 

Now we will specify the target point, till where the object should be stretched. 

Here I can use mouse and left click for the point till where I want this rectangle stretched. 

To make sure it stretches in 90 degree angle you can enable 'orthogonal restriction' from left tool bar 

which is available below snapping options. 

Just remember to uncheck or disable it afterwards. 

Now I will left click for target point somewhere up here 

and rectangle is stretched till that point. 

You can also stretch an object by a specific distance. 

Let us stretch this rectangle on other side to see it. 

Suppose If I want it to move 5 units to right, 

On the top menu, I will click on the "Modify option". Select "Stretch tool" . 

Select first corner, by using snap option-snap to grid and 

left click using mouse button on the top line somewhere in middle. 

Now select second corner as intersection of bottom lines, here. 

<nowiki>To specify distance at target point, at command prompt type @5<0, as I would want this rectangle to stretch 5 units to right. </nowiki>

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Practical use of Stretch tool 
| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| Let us see where can we use this tool. 

Say I have a drawing of a door, and would like to use it for other opening which is little longer in size. 

I do not need to redesign the door, 

I can copy this one by going to modify, 


move and copy, to new opening area. 

Go to modify copy. 

To select object, go to the tool bar and select the 'select window' option. 

Now left click outside the object to start window then 

hold left mouse button and drag and release after selection is done. 

Now move it to new location, give target point, intersection of this. 

So I have copied this door. 

Now I want to stretch it. 

Go to modify -stretch. I will use free positioning. 

For this I will select two corners of the door. 

Now for the reference point I will use end point. 

For target point, I need to stretch it till the top 

Here if lines do not appear straight, please use the orthogonal lines from tool bar. 

Remember to disable it after the use. 

And the door is stretched for new opening size. 

This sample door drawing is available for download with this tutorial. 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Check Mirror Tool 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| We will now see the Mirror tool. 

Let us open a new drawing, go to file -> new 

Draw horizontal line of length, say 50. 

From left tool bar click on line icon and 

select option for horizontal line, 

Here on top we can specify the line length. 

Choosing snap to grid option, left click on drawing area to place the line. 

Now I will draw line at an angle. I will use this option line with given angle. 

Say angle 67 and line of length 50. 

From start and somewhere on the entity, 

let's say here. 

We know that angles work anti-clockwise in QCAD so +67 will draw a line in the first quadrant. 

Let's mirror this line on the left hand side. Go to modify- > mirror from top menu. 

Select objects to mirror. Select line by left clicking on it.

<p style="color:blue">To continue the action click on the  arrow which is available on the left tool bar.</p>

Specify first point of mirror line, let's say end point of this one. 

And specify second point for mirror line. 

If you move your mouse it can show you where it is going to mirror the line. 

Since I want it on left hand side, for second point of mirror line, 

I need to give it somewhere up here. 

At this window select, keep original option. 

It has mirrored this line. 

Let's say I want to draw a rhombus using this tool. 

I can again use mirror tool. 

Then select both these lines by left clicking on it. 

Go to modify-> mirror, since I have already selected I can continue. 

For my mirror line this time, I want to mirror this on opposite side. 

So my imaginary mirror line will be end of this one, and end of this one. 

So rhombus is ready using mirror tool. 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 4 

(Assignment) 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| Now the assignment part. 

I would like you to draw following using tools learnt in this tutorial. 

[[Image:Qcad4_assignment.png]]Let's see it in detail window here.(go to QCAD application and open assignment file.) 

For stretch tool draw rectangle of size 50x10, and circle of radius 3 inside. Stretch it 5 units to right. 

Let's see for mirror tool, draw horizontal line and then draw line of 30 units at 67 degree angle. 

At the end of it draw another 30 units line. 

Mirror these two lines and draw line joining these end points. 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 5 

(About Spoken Tutorial Project) 
| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| The video available at this url [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial http://spoken-tutorial.org/What_is_a_Spoken_Tutorial] 

summarizes the spoken tutorial project 

If you do not have good bandwidth, you can download and watch it 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 6 

(About Spoken Tutorial Project) 
| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| We conduct workshops using spoken tutorials 

We also give certificates for those who pass an on-line test 

Please contact us for more details

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 7 

(Acknowledgement) 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| I would like to acknowledge the spoken tutorial project which is part of the talk to a teacher project. 

It is supported by the National Mission on Education through ICT, MHRD government of India. 

For more information on this please visit following website. 

[http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org/NMEICT-Intro] 

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| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:none;padding:0.049cm;"| Switch to Slide 8 



| style="border-top:none;border-bottom:0.092cm double #808080;border-left:0.092cm double #808080;border-right:0.092cm double #808080;padding:0.049cm;"| This is Leena signing off. 

Thank you for joining us.

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