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

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| Hello and welcome back to another QCAD tutorial.  

| Hello and welcome back to another QCAD tutorial.  

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| Drawing methods in QCAD and knowing coordinate system.

| Drawing methods in QCAD and knowing coordinate system.

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| Qcad uses Cartesian co-ordinate system, which consists of two numbered scales, called as x-axis, y-axis.

| Qcad uses Cartesian co-ordinate system, which consists of two numbered scales, called as x-axis, y-axis.

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| These are perpendicular to each other. These axis do divide coordinate system into 4 quadrants.

| These are perpendicular to each other. These axis do divide coordinate system into 4 quadrants.

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|Your work in QCAD will mostly be in quadrant I

|Your work in QCAD will mostly be in quadrant I

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|The point where these axis meet is called as absolute origin or the origin point.

|The point where these axis meet is called as absolute origin or the origin point.

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| For this tutorial, I am using the GNU Linux operating system Ubuntu Version 10.04 LTS  

| For this tutorial, I am using the GNU Linux operating system Ubuntu Version 10.04 LTS  

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|and QCAD Community Edition Version 2.0.5.0

|and QCAD Community Edition Version 2.0.5.0

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| In this tutorial we will see  

| In this tutorial we will see  

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| Cartesian coordinate system

| Cartesian coordinate system

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|How to use command line to draw objects  

|How to use command line to draw objects  

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|and different drawing methods available in QCAD  

|and different drawing methods available in QCAD  

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| Let's first see how to use command line to put in co-ordinates to draw points and draw objects of required measurements.

| Let's first see how to use command line to put in co-ordinates to draw points and draw objects of required measurements.

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|Using the Cartesian coordinate system.

|Using the Cartesian coordinate system.

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|Please have the QCAD application open in your system.

|Please have the QCAD application open in your system.

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| If you want to know how to install QCAD please refer to the earlier tutorial called as 'Introduction to QCAD'.

| If you want to know how to install QCAD please refer to the earlier tutorial called as 'Introduction to QCAD'.

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|Which is available on spoken-tutorial website.

|Which is available on spoken-tutorial website.

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|Once the application is open from the tool bar on left choose line tool- line with two points.

|Once the application is open from the tool bar on left choose line tool- line with two points.

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|Now focus on the command prompt, because we are going to use command line to put in exact coordinates.

|Now focus on the command prompt, because we are going to use command line to put in exact coordinates.

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|It is asking to 'specify first point' Let's enter 10 comma 10  

|It is asking to 'specify first point' Let's enter 10 comma 10  

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|We always add x axis value first and then y axis value.

|We always add x axis value first and then y axis value.

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|What it is going to do is, it will add a point 10 units away from x and from y axis.

|What it is going to do is, it will add a point 10 units away from x and from y axis.

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|Hit enter. See the point is entered in relation to this origin or absolute 0, 0

|Hit enter. See the point is entered in relation to this origin or absolute 0, 0

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|02:00  

|02:00  

|Which is 10 units away from x and 10 units away from y axis.

|Which is 10 units away from x and 10 units away from y axis.

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| Now suppose I want to draw a horizontal line in this direction, going away from this pint. Say 10 units.

| Now suppose I want to draw a horizontal line in this direction, going away from this pint. Say 10 units.

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|For the next point, I will add 20,10  

|For the next point, I will add 20,10  

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|X-axis value is 20 because, this point the new point will always be in relation to this absolute zero.

|X-axis value is 20 because, this point the new point will always be in relation to this absolute zero.

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|So to meet this distance of 10 I will have to add 10 units to the earlier point's X-value.

|So to meet this distance of 10 I will have to add 10 units to the earlier point's X-value.

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|And Y value will not change so it will be 10 here.

|And Y value will not change so it will be 10 here.

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|Now if I want to go vertical line downwards again of 10 units

|Now if I want to go vertical line downwards again of 10 units

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|for the next point at the command prompt I will put then say 20,0

|for the next point at the command prompt I will put then say 20,0

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|X-axis value won't change, Y-axis will be 20 units -ve from the earlier value. So it will be 0.

|X-axis value won't change, Y-axis will be 20 units -ve from the earlier value. So it will be 0.

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|Now again to go horizontal in 9 O'clock direction for the next point I will put (showing on application so pause for 4 sec. 3:11-3:15) 10,0

|Now again to go horizontal in 9 O'clock direction for the next point I will put (showing on application so pause for 4 sec. 3:11-3:15) 10,0

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|Here Y-axis won't change and X-axis will be -10.

|Here Y-axis won't change and X-axis will be -10.

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|In relation to the previously drawn point.

|In relation to the previously drawn point.

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|Now to close my drawing I can always put 'c' and hit enter or

|Now to close my drawing I can always put 'c' and hit enter or

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|I can go back to my original point which was 10,10.

|I can go back to my original point which was 10,10.

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|and it will close the drawing. This is how you draw using the command line input.

|and it will close the drawing. This is how you draw using the command line input.

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|You can draw any drawing by using this coordinate system by adding, subtracting absolute co-ordinates for any point or vertex between two segments.

|You can draw any drawing by using this coordinate system by adding, subtracting absolute co-ordinates for any point or vertex between two segments.

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|Like I did to draw this 10 units.

|Like I did to draw this 10 units.

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|But this is going to be little complicated.

|But this is going to be little complicated.

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|Rather QCAD offers three easy methods to draw objects with.

|Rather QCAD offers three easy methods to draw objects with.

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|It uses coordinates that are relative to the last point designated, rather than a 0,0 point of the drawing area.  

|It uses coordinates that are relative to the last point designated, rather than a 0,0 point of the drawing area.  

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|@ symbol is used to enter data using this system.

|@ symbol is used to enter data using this system.

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|Lets try drawing this previously drawn square using relative coordinate method.

|Lets try drawing this previously drawn square using relative coordinate method.

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|Let me clear the drawing area

|Let me clear the drawing area

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|Go to back line tool- Line with two points.

|Go to back line tool- Line with two points.

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|To specify first point at the command prompt enter 10,10- again x and y axis.

|To specify first point at the command prompt enter 10,10- again x and y axis.

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|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.

|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.

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|Whenever we want to use relative system @ symbol is a must.

|Whenever we want to use relative system @ symbol is a must.

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|After that, I want to draw horizontal line in 3 O'clock direction of 10 units.

|After that, I want to draw horizontal line in 3 O'clock direction of 10 units.

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|So X value is 10 so I put @10,0 because Y value is zero here.

|So X value is 10 so I put @10,0 because Y value is zero here.

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|Now for the vertical line going in downward direction, again for relative I use @

|Now for the vertical line going in downward direction, again for relative I use @

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|Then X value is zero but Y becomes -10 because it is going in opposite direction that is why value is -ve here.

|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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|Now X axis is -ve, it is going in opposite direction in relation to the previously drawn point. -10,0

|Now X axis is -ve, it is going in opposite direction in relation to the previously drawn point. -10,0

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|Now to close the drawing I can put 'C' and enter.

|Now to close the drawing I can put 'C' and enter.

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|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.

|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.

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|This is how you draw using relative coordinate method.

|This is how you draw using relative coordinate method.

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|It relies on distance and angle relative to the last specified point.

|It relies on distance and angle relative to the last specified point.

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|Always it is +ve and represents distance away from the first point.

|Always it is +ve and represents distance away from the first point.

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|Let's try and draw the Previously drawn square using this relative polar coordinate system.

|Let's try and draw the Previously drawn square using this relative polar coordinate system.

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| In polar coordinate, right towards towards 3 O'clock is always default zero angle.

| In polar coordinate, right towards towards 3 O'clock is always default zero angle.

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|All other angles are calculated in anti-clockwise direction related to default zero.

|All other angles are calculated in anti-clockwise direction related to default zero.

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|So let's go to line tool – again line with two points  

|So let's go to line tool – again line with two points  

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|at the command prompt specify first point as 10,10 -Enter. Point is drawn.

|at the command prompt specify first point as 10,10 -Enter. Point is drawn.

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|Now to draw horizontal line of 10 units using relative polar coordinates. I first put @ symbol because it is relative method.

|Now to draw horizontal line of 10 units using relative polar coordinates. I first put @ symbol because it is relative method.

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|Then I say distance, I know which is 10

|Then I say distance, I know which is 10

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|<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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|<nowiki>I know angle is in 3 O'clock direction, which is zero. (@10<0)</nowiki>

|<nowiki>I know angle is in 3 O'clock direction, which is zero. (@10<0)</nowiki>

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|so my horizontal line of 10 units is drawn.

|so my horizontal line of 10 units is drawn.

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|<nowiki>For the vertical line in downward direction I again put @10<270</nowiki>

|<nowiki>For the vertical line in downward direction I again put @10<270</nowiki>

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|and 270 as angle this time because anti-clockwise downward is 270

|and 270 as angle this time because anti-clockwise downward is 270

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|for the next point horizontal line in 9 O'clock direction

|for the next point horizontal line in 9 O'clock direction

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|<nowiki>I say @10<180, angle will be 180, as it is exactly opposite to the default zero position.</nowiki>

|<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>Lastly I can always put 'c' to close or else enter the point as @10<90, because it is going in upward direction.</nowiki>

|<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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|This completes our drawing in Polar coordinate method.

|This completes our drawing in Polar coordinate method.

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|Which can be used to draw lines by specifying first point in relation to already drawn object using snapping tools.  

|Which can be used to draw lines by specifying first point in relation to already drawn object using snapping tools.  

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|By placing a cursor at that point and entering a distance value.  

|By placing a cursor at that point and entering a distance value.  

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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.

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|I can do so by using this direct method.

|I can do so by using this direct method.

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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

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|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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|Now in relation to this I want to draw horizontal line of 20 units.

|Now in relation to this I want to draw horizontal line of 20 units.

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|So I use command line to specify my next point.

|So I use command line to specify my next point.

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|I can use relative polar coordinate system here.

|I can use relative polar coordinate system here.

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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 3O'clock direction, which is default zero angle so I say @20<0</nowiki>

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|and Enter. The line is drawn.

|and Enter. The line is drawn.

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|Now say I want vertical line of say 7 units going in 90 degrees direction.

|Now say I want vertical line of say 7 units going in 90 degrees direction.

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|I can use now relative coordinate method here.

|I can use now relative coordinate method here.

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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

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|and I can use relative coordinate method to draw this vertical line.

|and I can use relative coordinate method to draw this vertical line.

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|Again if I want horizontal line going in 9 O'clock direction say 5 units away.

|Again if I want horizontal line going in 9 O'clock direction say 5 units away.

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|I can again use relative coordinate method.

|I can again use relative coordinate method.

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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 -ve comma 0, Y is zero.

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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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|I can draw vertical line going towards 6 O'clock directions

|I can draw vertical line going towards 6 O'clock directions

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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.

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|Now to draw that vertical line, I can use relative polar coordinate.

|Now to draw that vertical line, I can use relative polar coordinate.

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|<nowiki>So I say @I know distance is 7, I use '<' symbol, since it is 6 O'clock direction it is going to be 270 </nowiki>

|<nowiki>So I say @I know distance is 7, I use '<' symbol, since it is 6 O'clock direction it is going to be 270 </nowiki>

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|This completes our drawing.

|This completes our drawing.

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|Lets come to the to the ASSIGNMENT.  

|Lets come to the to the ASSIGNMENT.  

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|i would like you to draw diagram as shown in the figure.  

|i would like you to draw diagram as shown in the figure.  

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|You can either use relative coordinate, relative polar, direct method or combination of any method to draw this.

|You can either use relative coordinate, relative polar, direct method or combination of any method to draw this.

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| I would like to acknowledge the spoken tutorial project which is part of the talk to a teacher project.

| I would like to acknowledge the spoken tutorial project which is part of the talk to a teacher project.

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

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

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|For more information on this please visit following website.  

|For more information on this please visit following website.  

| 11:46

| 11:46

|Thank you.

|Thank you.

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|Hope you are enjoying exploring QCAD

|Hope you are enjoying exploring QCAD

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|This is Leena signing off.  

|This is Leena signing off.  

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