Difference between revisions of "QCad/C2/Drawing-Methods-in-QCAD/English-timed"
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| − | |So, X-value is 10 | + | |So, X-value is 10. So, I put @10,0 because Y value is zero here. |
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| − | |Then X value is zero but Y becomes -10 because it is going in opposite direction | + | |Then X value is zero but Y becomes -10 because it is going in opposite direction. That is why value is -ve here. |
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| − | |For the next horizontal line in 9 O'clock direction, I say @ | + | |For the next horizontal line in 9 O'clock direction, I say @. |
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Revision as of 14:29, 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 here. |
| 05:36 | For the next horizontal line in 9 O'clock direction, I say @. |
| 05:43 | Now X axis is -ve, it is going in opposite direction in relation to the previously drawn point. -10,0 |
| 05:53 | 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 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 +ve 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 coordinate, right towards 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 coordinate 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 3O'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 coordinate 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 -ve 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 directions |
| 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 | Now to draw that vertical line, I can use relative polar coordinate. |
| 10:51 | So I say @I know distance is 7, I use '<' 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 | Lets come to the 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
