Lecture 2d point,curve,text,line clipping

2D CLIPPING ,[object Object],[object Object],[object Object],[object Object]

CLIPPING (Cont…) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Types of clipping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1.POINT CLIPPING ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2.Curve clipping ,[object Object],[object Object],[object Object],[object Object],[object Object]

Curve clipping (cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

3.TEXT CLIPPING ,[object Object],[object Object],[object Object],[object Object],[object Object]

TEXT CLIPPING (cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TEXT CLIPPING (cont) ,[object Object],[object Object],[object Object],TEXT CLIPPING (cont)

4.EXTERIOR CLIPPING ,[object Object],[object Object],[object Object]

5.Line Clipping ,[object Object],wy max wy min wx min wx max Window P 1 P 2 P 3 P 6 P 5 P 7 P 10 P 9 P 4 P 8

Line clipping procedure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Point Clipping ,[object Object],[object Object],[object Object],wy max wy min wx min wx max Window P 1 P 2 P 5 P 7 P 10 P 9 P 4 P 8 Clipped Points Within the Window are Not Clipped Clipped Clipped Clipped

Line Clipping ,[object Object],Situation Solution Example Both end-points inside the window Don’t clip One end-point inside the window, one outside Must clip Both end-points outside the window Clipping decision should be made appropriately

Line clipping – parametric test ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cohen-Sutherland Clipping Algorithm ,[object Object],[object Object],[object Object],[object Object]

Cohen-Sutherland: World Division ,[object Object],[object Object],[object Object],1001 1000 1010 0001 0000 Window 0010 0101 0100 0110 above below right left 3 2 1 0 Region Code

Cohen-Sutherland: Labelling ,[object Object],wy max wy min wx min wx max Window P 3 [0001] P 6 [0000] P 5 [0000] P 7 [0001] P 10 [0100] P 9 [0000] P 4 [1000] P 8 [0010] P 12 [0010] P 11 [1010] P 13 [0101] P 14 [0110]

Cohen-Sutherland: Lines In The Window Lines completely contained within the window boundaries have region code [0000] for both end-points so are not clipped wy max wy min wx min wx max Window P 3 [0001] P 6 [0000] P 5 [0000] P 7 [0001] P 10 [0100] P 9 [0000] P 4 [1000] P 8 [0010] P 12 [0010] P 11 [1010] P 13 [0101] P 14 [0110]

Cohen-Sutherland: Lines Outside The Window ,[object Object],[object Object],wy max wy min wx min wx max Window P 3 [0001] P 6 [0000] P 5 [0000] P 7 [0001] P 10 [0100] P 9 [0000] P 4 [1000] P 8 [0010] P 12 [0010] P 11 [1010] P 13 [0101] P 14 [0110]

Cohen-Sutherland: Other Lines ,[object Object],[object Object],[object Object],[object Object]

Cohen-Sutherland: Other Lines (cont…) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Cohen-Sutherland Examples ,[object Object],[object Object],[object Object],[object Object],[object Object],wy max wy min wx min wx max Window P 10 [0100] P 9 [0000] P 10 ’ [0000] P 9 [0000]

Cohen-Sutherland Examples (cont…) ,[object Object],[object Object],[object Object],[object Object],wy max wy min wx min wx max Window P 4 ’ [1001] P 3 [0001] P 4 [1000] P 3 [0001]

Cohen-Sutherland Examples (cont…) ,[object Object],[object Object],[object Object],wy max wy min wx min wx max Window P 7 ’ [0000] P 7 [0001] P 8 [0010] P 8 ’ [0000]

Cohen-Sutherland Examples (cont…) ,[object Object],[object Object],[object Object],[object Object],wy max wy min wx min wx max Window P 7 ’ [0000] P 7 [0001] P 8 [0010] P 8 ’ [0000]

Calculating Line Intersections ,[object Object],[object Object],[object Object],[object Object],[object Object]

Calculating Line Intersections (cont…) ,[object Object],[object Object],[object Object],[object Object]

Liang-Barsky line clipping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lecture 2d point,curve,text,line clipping

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