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transformtool: implement fromcenter constraint for shearing (old spec) 

This doesn't keep the pivot in place, it merely moves the opposite edge
by the same amount (but in the opposite direction).
This commit is contained in:
Mikael Magnusson 2012-06-15 11:16:15 +02:00
parent 9a58e878be
commit 948cf1801c
1 changed files with 39 additions and 1 deletions
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40
app/tools/gimpunifiedtransformtool.c
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@ -865,8 +865,11 @@ gimp_unified_transform_tool_motion (GimpTransformTool *transform_tool)
function == TRANSFORM_HANDLE_S_S ||
function == TRANSFORM_HANDLE_W_S)
{
gint left, right;
/* o for the opposite edge, for fromcenter */
gint left, right, lefto, righto;
gdouble dxo, dyo;
/* set up indices for this edge and the opposite edge */
if (function == TRANSFORM_HANDLE_N_S) {
left = 1; right = 0;
} else if (function == TRANSFORM_HANDLE_W_S) {
@ -877,6 +880,19 @@ gimp_unified_transform_tool_motion (GimpTransformTool *transform_tool)
left = 3; right = 1;
} else g_assert_not_reached ();
lefto = 3 - left;
righto = 3 - right;
if (fromcenter)
{
dxo = -dx;
dyo = -dy;
}
else
{
dxo = dyo = 0;
}
if (constrain)
{
/* restrict to movement along the side */
@ -891,11 +907,33 @@ gimp_unified_transform_tool_motion (GimpTransformTool *transform_tool)
dy = p.y;
}
if (constrain && fromcenter)
{
/* restrict to movement along the opposite side */
GimpVector2 lp = { .x = px[lefto], .y = py[lefto] },
rp = { .x = px[righto], .y = py[righto] },
p = { .x = dxo, .y = dyo },
side = vectorsubtract (rp, lp);
p = vectorproject (p, side);
dxo = p.x;
dyo = p.y;
}
*x[left] = px[left] + dx;
*y[left] = py[left] + dy;
*x[right] = px[right] + dx;
*y[right] = py[right] + dy;
/* We have to set these unconditionally, or the opposite edge will stay
* in place when you toggle the fromcenter constraint during an action */
*x[lefto] = px[lefto] + dxo;
*y[lefto] = py[lefto] + dyo;
*x[righto] = px[righto] + dxo;
*y[righto] = py[righto] + dyo;
}
/* perspective transform */