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From: Damon Chaplin <damon@ka...>  20071104 13:02:01

On Sun, 20071104 at 13:46 +0100, Murray Cumming wrote: > On Sun, 20071104 at 12:30 +0000, Damon Chaplin wrote: > > On Sat, 20071103 at 16:33 +0100, Murray Cumming wrote: > > > > > However, I admit that I still see no way to implement a getter for this, > > > unless we store the values separately. This is the implementation of the > > > setter: > > > > > > void > > > goo_canvas_item_set_simple_transform (GooCanvasItem *item, > > > gdouble x, > > > gdouble y, > > > gdouble scale, > > > gdouble rotation) > > > { > > > GooCanvasItemIface *iface = GOO_CANVAS_ITEM_GET_IFACE (item); > > > cairo_matrix_t new_matrix = { 1, 0, 0, 1, 0, 0 }; > > > > > > cairo_matrix_translate (&new_matrix, x, y); > > > cairo_matrix_scale (&new_matrix, scale, scale); > > > cairo_matrix_rotate (&new_matrix, rotation * (M_PI / 180)); > > > iface>set_transform (item, &new_matrix); > > > } > > > > > > You can use the code from _goo_canvas_item_animate_internal(), which has > > to figure out x_start, y_start, scale_start and radians_start from a > > transformation matrix: > > > > cairo_matrix_t tmp_matrix = anim>start; > > double x1 = 1.0, y1 = 0.0; > > > > anim>x_start = tmp_matrix.x0; > > anim>y_start = tmp_matrix.y0; > > > > tmp_matrix.x0 = 0.0; > > tmp_matrix.y0 = 0.0; > > > > cairo_matrix_transform_point (&tmp_matrix, &x1, &y1); > > anim>scale_start = sqrt (x1 * x1 + y1 * y1); > > anim>radians_start = atan2 (y1, x1); > > > > That seems to work OK, though it only works for simple transformations  > > no skews or separate x & y scales. > > I'm not very happy about providing a function that will return incorrect > information if, for instance, a skew was used. It the function is called goo_canvas_item_get_simple_transform() and is the opposite of goo_canvas_item_set_simple_transform() I think it is OK. I don't think you can do much better with transformations, as they can result from a series of operations (or could just be arbitrary values) and you can't unscramble them. Damon 
From: Murray Cumming <murrayc@mu...>  20071104 12:46:51

On Sun, 20071104 at 12:30 +0000, Damon Chaplin wrote: > On Sat, 20071103 at 16:33 +0100, Murray Cumming wrote: > > > However, I admit that I still see no way to implement a getter for this, > > unless we store the values separately. This is the implementation of the > > setter: > > > > void > > goo_canvas_item_set_simple_transform (GooCanvasItem *item, > > gdouble x, > > gdouble y, > > gdouble scale, > > gdouble rotation) > > { > > GooCanvasItemIface *iface = GOO_CANVAS_ITEM_GET_IFACE (item); > > cairo_matrix_t new_matrix = { 1, 0, 0, 1, 0, 0 }; > > > > cairo_matrix_translate (&new_matrix, x, y); > > cairo_matrix_scale (&new_matrix, scale, scale); > > cairo_matrix_rotate (&new_matrix, rotation * (M_PI / 180)); > > iface>set_transform (item, &new_matrix); > > } > > > You can use the code from _goo_canvas_item_animate_internal(), which has > to figure out x_start, y_start, scale_start and radians_start from a > transformation matrix: > > cairo_matrix_t tmp_matrix = anim>start; > double x1 = 1.0, y1 = 0.0; > > anim>x_start = tmp_matrix.x0; > anim>y_start = tmp_matrix.y0; > > tmp_matrix.x0 = 0.0; > tmp_matrix.y0 = 0.0; > > cairo_matrix_transform_point (&tmp_matrix, &x1, &y1); > anim>scale_start = sqrt (x1 * x1 + y1 * y1); > anim>radians_start = atan2 (y1, x1); > > That seems to work OK, though it only works for simple transformations  > no skews or separate x & y scales. I'm not very happy about providing a function that will return incorrect information if, for instance, a skew was used.  murrayc@... http://www.murrayc.com http://www.openismus.com 
From: Damon Chaplin <damon@ka...>  20071104 12:31:10

On Sat, 20071103 at 16:33 +0100, Murray Cumming wrote: > However, I admit that I still see no way to implement a getter for this, > unless we store the values separately. This is the implementation of the > setter: > > void > goo_canvas_item_set_simple_transform (GooCanvasItem *item, > gdouble x, > gdouble y, > gdouble scale, > gdouble rotation) > { > GooCanvasItemIface *iface = GOO_CANVAS_ITEM_GET_IFACE (item); > cairo_matrix_t new_matrix = { 1, 0, 0, 1, 0, 0 }; > > cairo_matrix_translate (&new_matrix, x, y); > cairo_matrix_scale (&new_matrix, scale, scale); > cairo_matrix_rotate (&new_matrix, rotation * (M_PI / 180)); > iface>set_transform (item, &new_matrix); > } You can use the code from _goo_canvas_item_animate_internal(), which has to figure out x_start, y_start, scale_start and radians_start from a transformation matrix: cairo_matrix_t tmp_matrix = anim>start; double x1 = 1.0, y1 = 0.0; anim>x_start = tmp_matrix.x0; anim>y_start = tmp_matrix.y0; tmp_matrix.x0 = 0.0; tmp_matrix.y0 = 0.0; cairo_matrix_transform_point (&tmp_matrix, &x1, &y1); anim>scale_start = sqrt (x1 * x1 + y1 * y1); anim>radians_start = atan2 (y1, x1); That seems to work OK, though it only works for simple transformations  no skews or separate x & y scales. Damon 