Patent ID: 8350822

Claim:
A method of operating a touch pad with multi-objects, comprising steps of: sensing touch points of first and second fingers on said touch pad to assert a first position coordinate (X1, Y1) and a second position coordinate (X2, Y2), respectively; moving said second finger on said touch pad to a first further touch point, and sensing said first further touch point to assert a third position coordinate (X3, Y3) and moving said first finger on said touch pad to a second further touch point, and sensing said second further touch point to assert a fourth position coordinate (X4, Y4); measuring a first slope S 12 according to said first position coordinate (X1, Y1) and said second position coordinate (X2, Y2), measuring a second slope S 13 according to said first position coordinate (X1, Y1) and said third position coordinate (X3, Y3), measuring a third slope S 23 according to said second position coordinate (X2, Y2) and said third position coordinate (X3, Y3), and measuring a fourth slope S 14 according to said first position coordinate (X1, Y1) and said fourth position coordinate (X4, Y4), and measuring a fifth slope S 43 according to said fourth position coordinate (X4, Y4) and said third position coordinate (X3, Y3); generating a movement amount control signal according to said first slope S 12 , said second slope S 13 , said third slope S 23 , said first position coordinate (X1, Y1), said second position coordinate (X2, Y2) and said third position coordinate (X3, Y3) generating said movement amount control signal to control a first zoom in/out action of a software object if S 12 ≧0, S 23 ≧0, S 14 ≧0, S 43 ≧0, (X2-X1)>(X3-X4), and (Y2-Y1)>(Y3-Y4), or if S 12 <0, S 23 <0, S 14 <0, S 43 <0, (X2-X1)>(X3-X4), and (Y2-Y1)>(Y3-Y4); and generating said movement amount control signal to control a second zoom in/out action of said software object if S 12 ≧0, S 23 ≧0, S 14 ≧0, S 43 ≧0, (X2-X1)<(X3-X4), and (Y2-Y1)<(Y3-Y4), or if S 12 <0, S 23 <0, S 14 <0, S 43 <0, (X2-X1)<(X3-X4), and (Y2-Y1)<(Y3-Y4), wherein said first, second, third and fourth position coordinates are obtained in an absolute two-dimensional coordinate system or a relative two-dimensional coordinate system, and wherein said first zoom in/out action and said second zoom in/out action are respectively a zoom out action and a zoom in action, said software object is a digital image, and said behaviors of said software object include zoom in/out amount and zoom in/out direction of said digital image.