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Implement snap to isometric grid

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This commit is contained in:
Liebranca 2024-10-14 20:37:24 -03:00
parent 14b64f341e
commit 156cf0cfcf
1 changed files with 51 additions and 0 deletions
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51
src/app/snap_to_grid.cpp
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@ -11,6 +11,11 @@
#include "app/snap_to_grid.h"
#include "app/app.h"
#include "app/context.h"
#include "app/doc.h"
#include "app/pref/preferences.h"
#include "doc/grid.h"
#include "gfx/point.h"
#include "gfx/rect.h"
@ -18,11 +23,57 @@
namespace app {
gfx::Point snap_to_isometric_grid(const gfx::Rect& grid,
const gfx::Point& point,
const PreferSnapTo prefer)
{
// Convert point to grid space
gfx::PointF newPoint(int((point.x - grid.x) / double(grid.w)) * grid.w,
int((point.y - grid.y) / double(grid.h)) * grid.h);
// Substract this from original point (also in grid space)
// to obtain newPoint as an offset within the first grid cell
const gfx::PointF diff((point - grid.origin()) - newPoint);
// We now find the closest corner to that offset
const gfx::PointF candidates[] = { gfx::PointF(grid.w * 0.5, 0),
gfx::PointF(grid.w * 0.5, grid.h),
gfx::PointF(0, grid.h * 0.5),
gfx::PointF(grid.w, grid.h * 0.5) };
gfx::PointF near(grid.origin());
double dist = (grid.w + grid.h) * 2;
for (const auto& c : candidates) {
gfx::PointF vto = diff - c;
if (vto.x < 0)
vto.x = -vto.x;
if (vto.y < 0)
vto.y = -vto.y;
const double newDist = vto.x + vto.y;
if (newDist < dist) {
near = c;
dist = newDist;
}
}
// TODO: translate the use of the 'prefer' argument from
// the orthogonal logic to this function
// Convert cell offset to pixel space
newPoint += near + grid.origin();
return gfx::Point(std::round(newPoint.x), std::round(newPoint.y));
}
gfx::Point snap_to_grid(const gfx::Rect& grid, const gfx::Point& point, const PreferSnapTo prefer)
{
if (grid.isEmpty())
return point;
// Use different logic for isometric grid
const doc::Grid::Type gridType =
App::instance()->preferences().document(App::instance()->context()->documents()[0]).grid.type();
if (gridType == doc::Grid::Type::Isometric)
return snap_to_isometric_grid(grid, point, prefer);
div_t d, dx, dy;
dx = std::div(grid.x, grid.w);
dy = std::div(grid.y, grid.h);