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My_GtkUi
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Update Free drawing

This commit is contained in:
daleclack 2024-02-19 21:53:17 +08:00
parent ddb97dd4f8
commit f3a7f151b1
1 changed files with 18 additions and 4 deletions
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22
Gtk4_Reset/src/draw_app/DrawApp.cpp
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@ -17,6 +17,7 @@ struct _DrawApp
cairo_surface_t *surface;
GtkGesture *drag;
double start_x, start_y;
double prev_x, prev_y;
};
G_DEFINE_TYPE(DrawApp, draw_app, GTK_TYPE_WINDOW)
@ -63,7 +64,7 @@ static void draw_app_draw(GtkDrawingArea *da,
cairo_paint(cr);
}
static void draw_brush(DrawApp *app, double x, double y)
static void draw_brush(DrawApp *app, double x, double y, gboolean first)
{
GdkRectangle update_rect;
cairo_t *cr;
@ -81,10 +82,23 @@ static void draw_brush(DrawApp *app, double x, double y)
/* Paint to the surface, where we store our state */
cr = cairo_create(app->surface);
cairo_set_line_width(cr, 6);
gdk_cairo_rectangle(cr, &update_rect);
cairo_fill(cr);
// Draw lines to link points
if (!first)
{
cairo_move_to(cr, app->prev_x, app->prev_y);
cairo_line_to(cr, x, y);
cairo_stroke(cr);
}
// Update position for next point
app->prev_x = x;
app->prev_y = y;
cairo_destroy(cr);
gtk_widget_queue_draw(widget);
@ -97,7 +111,7 @@ static void drag_begin(GtkGestureDrag *gesture,
{
app->start_x = x;
app->start_y = y;
draw_brush(app, x, y);
draw_brush(app, x, y, TRUE);
}
static void drag_update(GtkGestureDrag *gesture,
@ -105,7 +119,7 @@ static void drag_update(GtkGestureDrag *gesture,
double y,
DrawApp *app)
{
draw_brush(app, (app->start_x) + x, (app->start_y) + y);
draw_brush(app, (app->start_x) + x, (app->start_y) + y, FALSE);
}
static void drag_end(GtkGestureDrag *gesture,
@ -113,7 +127,7 @@ static void drag_end(GtkGestureDrag *gesture,
double y,
DrawApp *app)
{
draw_brush(app, (app->start_x) + x, (app->start_y) + y);
draw_brush(app, (app->start_x) + x, (app->start_y) + y, FALSE);
}
static void draw_app_init(DrawApp *self)