Difference between revisions of "QCad/C2/Drawing-Methods-in-QCAD/English-timed"

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|07:14
 
|07:14
 
|<nowiki>I use this symbol (<) less than symbol “<” for angle</nowiki>
 
|<nowiki>I use this symbol (<) less than symbol “<” for angle</nowiki>
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|07:30
 
|07:30
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|<nowiki>For the vertical line in downward direction I again put @10<270</nowiki>
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|<nowiki> For the vertical line in downward direction, I again put @10<270</nowiki>
  
 
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|-
 
|07:37
 
|07:37
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|and 270 as angle this time because anti-clockwise downward is 270
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|and 270 as angle this time because anti-clockwise downward is 270.
  
 
|-
 
|-
 
|07:50
 
|07:50
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|for the next point horizontal line in 9 O'clock direction
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|For the next point, horizontal line in 9 O'clock direction,
  
 
|-
 
|-
 
|07:54  
 
|07:54  
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|<nowiki>I say @10<180, angle will be 180, as it is exactly opposite to the default zero position.</nowiki>
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|<nowiki> I say @10<180, angle will be 180 as it is exactly opposite to the default zero position.</nowiki>
  
 
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|-
 
|08:05
 
|08:05
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|<nowiki>Lastly I can always put 'c' to close or else enter the point as @10<90, because it is going in upward direction.</nowiki>
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|<nowiki>Lastly, I can always put 'c' to close or else enter the point as @10<90; because, it is going in upward direction.</nowiki>
  
 
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|-
 
|08:16
 
|08:16
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|This completes our drawing in Polar coordinate method.
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|This completes our drawing in '''Polar coordinates''' method.
  
 
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|-
 
| 08:19
 
| 08:19
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|Third is the Direct distance method
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|Third is the '''Direct distance''' method
  
 
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|08:22
 
|08:22
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|Which can be used to draw lines by specifying first point in relation to already drawn object using snapping tools.
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|which can be used to draw lines by specifying first point in relation to already drawn object using '''snapping tools'''
  
 
|-
 
|-
 
|08:30  
 
|08:30  
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|By placing a cursor at that point and entering a distance value.  
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|by placing a cursor at that point and entering a distance value.  
  
 
|-
 
|-
 
|08:35
 
|08:35
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| Let's say in this drawing, if I want to put a horizontal line going in 3 O'clock direction exactly from this point.
+
| Let's say- in this drawing, if I want to put a horizontal line going in 3 O'clock direction exactly from this point.
  
 
|-
 
|-
 
|08:43  
 
|08:43  
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|I can do so by using this direct method.
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|I can do so by using this '''direct''' method.
  
 
|-
 
|-
 
|08:50
 
|08:50
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|I choose line- line with two points. Now I know exactly at what point I want line ahead
+
|I choose '''Line- Line with two points'''. Now I know exactly at what point I want line ahead.
  
 
|-
 
|-
 
|08:57  
 
|08:57  
−
|so from snapping options on the left tool bar I choose 'snap to endpoint' and then go on that point and left click to select the first point.
+
|So, from '''Snapping''' options on the left tool bar, I choose 'snap to endpoint' and then go on that point and left-click to select the first point.
  
 
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|09:09
 
|09:09
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|Now in relation to this I want to draw horizontal line of 20 units.
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|Now, in relation to this I want to draw horizontal line of 20 units.
  
 
|-
 
|-
 
|09:15
 
|09:15
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|So I use command line to specify my next point.
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|So, I use '''command line''' to specify my next point.
  
 
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|-
 
|09:20  
 
|09:20  
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|I can use relative polar coordinate system here.
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|I can use '''relative polar coordinate system''' here.
  
 
|-
 
|-
 
|09:24
 
|09:24
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|<nowiki>Since it is relative I say @ now distance is 20 and in 3O'clock direction, which is default zero angle so I say @20<0</nowiki>
+
|<nowiki>Since it is relative, I say @ now distance is 20 and in 3 O'clock direction which is default zero angle. So, I say @20<0</nowiki>
  
 
|-
 
|-
 
|09:36
 
|09:36
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|and Enter. The line is drawn.
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|and '''Enter'''. The line is drawn.
  
 
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|-
 
|09:39  
 
|09:39  
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|Now say I want vertical line of say 7 units going in 90 degrees direction.
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|Now say, I want vertical line of say 7 units going in 90 degrees direction.
  
 
|-
 
|-
 
|09:46
 
|09:46
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|I can use now relative coordinate method here.
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|I can use now '''relative co-ordinate''' method here.
  
 
|-
 
|-
 
|09:52  
 
|09:52  
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|and say @ (I know 7 is Y direction and X is zero)so 0,7
+
|And, say @ (I know 7 is Y direction and X is zero) so 0,7
  
 
|-
 
|-
 
|10:01  
 
|10:01  
−
|and I can use relative coordinate method to draw this vertical line.
+
|and I can use '''relative coordinate''' method to draw this vertical line.
  
 
|-
 
|-
 
|10:07
 
|10:07
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|Again if I want horizontal line going in 9 O'clock direction say 5 units away.
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|Again, if I want horizontal line going in 9 O'clock direction, say 5 units away.
  
 
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|10:12
 
|10:12
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| At the command prompt I say @ -5 now because X value will be -ve comma 0, Y is zero.
+
| At the '''command prompt''', I say @ -5 now because X value will be negetive comma 0, Y is zero.
  
 
|-
 
|-
 
|10:18
 
|10:18
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|Now I can close down this line, because I know the distance is 7
+
|Now, I can close down this line because I know the distance is 7.
  
 
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|-
 
|10:33  
 
|10:33  
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|I can draw vertical line going towards 6 O'clock directions
+
|I can draw vertical line going towards 6 O'clock direction.
  
 
|-
 
|-
 
|10:39  
 
|10:39  
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|Once I know all the different methods I can draw objects with. I can use combination of any to draw objects.
+
|Once I know all the different methods I can draw objects with, I can use combination of any to draw objects.
  
 
|-
 
|-
 
|10:46  
 
|10:46  
−
|So, now to draw that vertical line, I can use relative polar  
+
|So, now to draw that vertical line, I can use relative polar method.
  
 
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|11.10
 
|11.10
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|Now that you are familiar with drawing methods and the coordinates system in QCAD  
+
|Now that you are familiar with drawing methods and the coordinates system in QCAD,
  
 
|-
 
|-

Revision as of 16:03, 23 January 2016

Time Narration
00:00 Hello and welcome back to another QCAD tutorial
00:04 Drawing methods in QCAD and knowing coordinate system.
00:09 QCAD uses Cartesian co-ordinate system which consists of two numbered scales, called as x-axis, y-axis.
00:17 These are perpendicular to each other. These axes divide coordinate system into 4 quadrants.
00:24 Your work in QCAD will mostly be in quadrant I.
00:27 The point where these axes meet is called as absolute origin or the origin point.
00:34 For this tutorial, I am using the GNU Linux operating system Ubuntu Version 10.04 LTS
00:40 and QCAD Community Edition Version 2.0.5.0
00:46 In this tutorial, we will see:
00:48 * Cartesian coordinate system
00:51 * How to use command line to draw objects and
00:53 * different drawing methods available in QCAD.
00:56 Let's first see how to use command line to put in co-ordinates, to draw points and draw objects of required measurements
01:06 using the Cartesian coordinate system.
01:08 Please have the QCAD application open in your system.
01:11 If you want to know how to install QCAD, please refer to the earlier tutorial called 'Introduction to QCAD'
01:18 which is available on spoken-tutorial website.
01:22 Once the application is open, from the tool bar on left, choose Line tool- Line with two points.
01:28 Now focus on the command prompt because we are going to use command line to put in exact coordinates.
01:35 It is asking to 'specify first point'. Let's put 10 comma 10.
01:41 We always put X-axis value first and then the Y-axis value.
01:45 What it is going to do is, it will add a point, 10 units away from X and from Y-axis.
01:53 Hit Enter. See the point is entered in relation to this origin or absolute 0, 0
02:00 which is 10 units away from X and 10 units away from Y-axis.
02:05 Now, suppose I want to draw a horizontal line in this direction, going away from this point, say 10 units.
02:13 For the next point, I will add 20, 10.
02:18 X-axis value is 20 because this point, the new point, will always be in relation to this absolute zero.
02:27 So, to meet the distance of 10, I will have to add 10 units to the earlier point's X-value.
02:35 And Y-value will not change; so, it will be 10 here.
02:40 Now, if I want to go vertical line downwards again of 10 units,
02:46 for the next point at the command prompt, I will put 20, 0.
02:56 X-axis value won't change, Y-axis will be 20 units -ve from the earlier value. So, it will be 0.
03:05 Now, again to go horizontal in 9 (nine) O'clock direction, for the next point, I will put (showing on application so pause for 4 sec. 3:11-3:15) 10, 0.
03:20 Here, Y-axis won't change and X-axis will be -10
03:26 in relation to the previously drawn point.
03:29 Now, to close my drawing I can always put 'c' and hit Enter or
03:35 I can go back to my original point which was 10, 10
03:39 and it will close the drawing. This is how you draw using the command line input.
03:45 You can draw any drawing by using this coordinate system by adding, subtracting absolute co-ordinates for any point or vertex between two segments
03:56 like I did to draw this 10 units.
04:00 But this is going to be little complicated.
04:03 Rather QCAD offers three easy methods to draw objects with.
04:09 First is Relative co-ordinates System.
04:12 It uses coordinates that are relative to the last point designated, rather than a 0,0 point of the drawing area.
04:19 "@" symbol is used to enter data, using this system.
04:26 Let's try drawing this previously drawn square, using relative coordinate system.
04:30 Let me clear my drawing.
04:35 Go back to line tool- Line with two points.
04:38 To specify first point, at the command prompt, enter 10,10- again X and Y-axis.
04:46 It is going to put point at 10,10 distance. For the next point, now that we are using relative system, we have to put '@' symbol.
04:57 Whenever we want to use relative system '@' symbol is a must.
05:01 After that, I want to draw horizontal line in 3 O'clock direction of 10 units.
05:08 So, X value is 10. So, I put @10,0 because Y value is zero here.
05:16 Now, for the vertical line going in downward direction, again for relative I use '@'.
05:24 Then X value is zero but Y becomes -10 because it is going in opposite direction. That is why value is -ve (negetive) here.
05:36 For the next horizontal line in 9 O'clock direction, I say @.
05:43 Now X-axis is -ve (negetive), it is going in opposite direction in relation to the previously drawn point -10,0.
05:53 And now, to close the drawing, I can put 'C' and Enter.
05:57 Or to go back to that original point- This case I say @ 0 X-axis is zero and Y is going vertical in +ve direction, so +10.
06:11 This is how you draw using relative coordinate method.
06:16 Next is Relative Polar co-ordinate system.
06:20 It relies on distance and angle relative to the last specified point.
06:24 Always it is positive and represents distance away from the first point.
06:30 Let's try and draw the previously drawn square, using this (relative) polar coordinate system.
06:36 In polar coordinates, right towards 3 O'clock is always default zero angle.
06:42 All other angles are calculated in anti-clockwise direction related to default zero.
06:48 So, let's go to Line tool – again Line with two points.
06:52 At the command prompt, specify first point as 10,10. Enter. Point is drawn.
07:00 Now, to draw horizontal line of 10 units using relative polar coordinates, I first put @ symbol because it is relative method.
07:10 Then I say distance, I know which is 10.
07:14 I use this symbol (<) less than symbol “<” for angle
07:23 I know angle is in 3 O'clock direction, which is zero. (@10<0)
07:28 So, my horizontal line of 10 units is drawn.
07:30 For the vertical line in downward direction, I again put @10<270
07:37 and 270 as angle this time because anti-clockwise downward is 270.
07:50 For the next point, horizontal line in 9 O'clock direction,
07:54 I say @10<180, angle will be 180 as it is exactly opposite to the default zero position.
08:05 Lastly, I can always put 'c' to close or else enter the point as @10<90; because, it is going in upward direction.
08:16 This completes our drawing in Polar coordinates method.
08:19 Third is the Direct distance method
08:22 which can be used to draw lines by specifying first point in relation to already drawn object using snapping tools
08:30 by placing a cursor at that point and entering a distance value.
08:35 Let's say- in this drawing, if I want to put a horizontal line going in 3 O'clock direction exactly from this point.
08:43 I can do so by using this direct method.
08:50 I choose Line- Line with two points. Now I know exactly at what point I want line ahead.
08:57 So, from Snapping options on the left tool bar, I choose 'snap to endpoint' and then go on that point and left-click to select the first point.
09:09 Now, in relation to this I want to draw horizontal line of 20 units.
09:15 So, I use command line to specify my next point.
09:20 I can use relative polar coordinate system here.
09:24 Since it is relative, I say @ now distance is 20 and in 3 O'clock direction which is default zero angle. So, I say @20<0
09:36 and Enter. The line is drawn.
09:39 Now say, I want vertical line of say 7 units going in 90 degrees direction.
09:46 I can use now relative co-ordinate method here.
09:52 And, say @ (I know 7 is Y direction and X is zero) so 0,7
10:01 and I can use relative coordinate method to draw this vertical line.
10:07 Again, if I want horizontal line going in 9 O'clock direction, say 5 units away.
10:12 I can again use relative coordinate method.
10:12 At the command prompt, I say @ -5 now because X value will be negetive comma 0, Y is zero.
10:18 Now, I can close down this line because I know the distance is 7.
10:33 I can draw vertical line going towards 6 O'clock direction.
10:39 Once I know all the different methods I can draw objects with, I can use combination of any to draw objects.
10:46 So, now to draw that vertical line, I can use relative polar method.
10:51 So, I say @ I know distance is 7, I use '<' (angle) symbol since it is 6 O'clock direction, it is going to be 270.
11:00 This completes our drawing.
11.06 This is how you use different methods in QCAD.
11.10 Now that you are familiar with drawing methods and the coordinates system in QCAD,
11:15 let's come to the assignment.
11:17 I would like you to draw diagram as shown in the figure.
11:20 You can either use relative coordinate, relative polar, direct method or combination of any method to draw this.
11:29 I would like to acknowledge the Spoken tutorial project which is part of the Talk to a teacher project.
11:33 It is supported by the National Mission on Education through ICT, MHRD, government of India.
11:40 For more information on this, please visit following website.
11:46 Thank you.
11:47 Hope you are enjoying exploring QCAD.
11:50 This is Leena, signing off.

Contributors and Content Editors

Minal, Nancyvarkey, PoojaMoolya, Pratik kamble, Sandhya.np14

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