1 files changed, 224 insertions, 0 deletions
diff --git a/source/blender/editors/manipulator_library/manipulator_types/arrow2d_manipulator.c b/source/blender/editors/manipulator_library/manipulator_types/arrow2d_manipulator.c
new file mode 100644
index 00000000000..749e92e25fb
--- /dev/null
+++ b/source/blender/editors/manipulator_library/manipulator_types/arrow2d_manipulator.c
@@ -0,0 +1,224 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2016 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file arrow2d_manipulator.c
+ *  \ingroup wm
+ *
+ * \name 2D Arrow Manipulator
+ *
+ * \brief Simple arrow manipulator which is dragged into a certain direction.
+ */
+
+#include "BLI_listbase.h"
+#include "BLI_math.h"
+#include "BLI_rect.h"
+
+#include "DNA_windowmanager_types.h"
+
+#include "BKE_context.h"
+
+#include "BIF_gl.h"
+
+#include "GPU_draw.h"
+#include "GPU_immediate.h"
+#include "GPU_matrix.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "RNA_access.h"
+#include "RNA_define.h"
+
+#include "WM_types.h"
+
+#include "ED_screen.h"
+#include "ED_manipulator_library.h"
+
+/* own includes */
+#include "WM_api.h"
+
+#include "../manipulator_library_intern.h"
+
+static void arrow2d_draw_geom(wmManipulator *mpr, const float matrix[4][4], const float color[4])
+{
+	const float size = 0.11f;
+	const float size_breadth = size / 2.0f;
+	const float size_length = size * 1.7f;
+	/* Subtract the length so the arrow fits in the hotspot. */
+	const float arrow_length = RNA_float_get(mpr->ptr, "length") - size_length;
+	const float arrow_angle = RNA_float_get(mpr->ptr, "angle");
+
+	uint pos = GWN_vertformat_attr_add(immVertexFormat(), "pos", GWN_COMP_F32, 2, GWN_FETCH_FLOAT);
+
+	gpuPushMatrix();
+	gpuMultMatrix(matrix);
+	gpuRotate2D(RAD2DEGF(arrow_angle));
+
+	immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+
+	immUniformColor4fv(color);
+
+	immBegin(GWN_PRIM_LINES, 2);
+	immVertex2f(pos, 0.0f, 0.0f);
+	immVertex2f(pos, 0.0f, arrow_length);
+	immEnd();
+
+	immBegin(GWN_PRIM_TRIS, 3);
+	immVertex2f(pos, size_breadth, arrow_length);
+	immVertex2f(pos, -size_breadth, arrow_length);
+	immVertex2f(pos, 0.0f, arrow_length + size_length);
+	immEnd();
+
+	immUnbindProgram();
+
+	gpuPopMatrix();
+}
+
+static void manipulator_arrow2d_draw(const bContext *UNUSED(C), wmManipulator *mpr)
+{
+	float color[4];
+
+	float matrix_final[4][4];
+
+	manipulator_color_get(mpr, mpr->state & WM_MANIPULATOR_STATE_HIGHLIGHT, color);
+
+	glLineWidth(mpr->line_width);
+
+	WM_manipulator_calc_matrix_final(mpr, matrix_final);
+
+	glEnable(GL_BLEND);
+	arrow2d_draw_geom(mpr, matrix_final, color);
+	glDisable(GL_BLEND);
+
+	if (mpr->interaction_data) {
+		ManipulatorInteraction *inter = mpr->interaction_data;
+
+		glEnable(GL_BLEND);
+		arrow2d_draw_geom(mpr, inter->init_matrix_final, (const float[4]){0.5f, 0.5f, 0.5f, 0.5f});
+		glDisable(GL_BLEND);
+	}
+}
+
+static void manipulator_arrow2d_setup(wmManipulator *mpr)
+{
+	mpr->flag |= WM_MANIPULATOR_DRAW_MODAL;
+}
+
+static int manipulator_arrow2d_invoke(
+        bContext *UNUSED(C), wmManipulator *mpr, const wmEvent *UNUSED(event))
+{
+	ManipulatorInteraction *inter = MEM_callocN(sizeof(ManipulatorInteraction), __func__);
+
+	copy_m4_m4(inter->init_matrix_basis, mpr->matrix_basis);
+	WM_manipulator_calc_matrix_final(mpr, inter->init_matrix_final);
+
+	mpr->interaction_data = inter;
+
+	return OPERATOR_RUNNING_MODAL;
+}
+
+static int manipulator_arrow2d_test_select(
+        bContext *UNUSED(C), wmManipulator *mpr, const wmEvent *event)
+{
+	const float mval[2] = {event->mval[0], event->mval[1]};
+	const float arrow_length = RNA_float_get(mpr->ptr, "length");
+	const float arrow_angle = RNA_float_get(mpr->ptr, "angle");
+	const float line_len = arrow_length * mpr->scale_final;
+	float mval_local[2];
+
+	copy_v2_v2(mval_local, mval);
+	sub_v2_v2(mval_local, mpr->matrix_basis[3]);
+
+	float line[2][2];
+	line[0][0] = line[0][1] = line[1][0] = 0.0f;
+	line[1][1] = line_len;
+
+	/* rotate only if needed */
+	if (arrow_angle != 0.0f) {
+		float rot_point[2];
+		copy_v2_v2(rot_point, line[1]);
+		rotate_v2_v2fl(line[1], rot_point, arrow_angle);
+	}
+
+	/* arrow line intersection check */
+	float isect_1[2], isect_2[2];
+	const int isect = isect_line_sphere_v2(
+	        line[0], line[1], mval_local, MANIPULATOR_HOTSPOT + mpr->line_width * 0.5f,
+	        isect_1, isect_2);
+
+	if (isect > 0) {
+		float line_ext[2][2]; /* extended line for segment check including hotspot */
+		copy_v2_v2(line_ext[0], line[0]);
+		line_ext[1][0] = line[1][0] + MANIPULATOR_HOTSPOT * ((line[1][0] - line[0][0]) / line_len);
+		line_ext[1][1] = line[1][1] + MANIPULATOR_HOTSPOT * ((line[1][1] - line[0][1]) / line_len);
+
+		const float lambda_1 = line_point_factor_v2(isect_1, line_ext[0], line_ext[1]);
+		if (isect == 1) {
+			if (IN_RANGE_INCL(lambda_1, 0.0f, 1.0f)) {
+				return 0;
+			}
+		}
+		else {
+			BLI_assert(isect == 2);
+			const float lambda_2 = line_point_factor_v2(isect_2, line_ext[0], line_ext[1]);
+			if (IN_RANGE_INCL(lambda_1, 0.0f, 1.0f) && IN_RANGE_INCL(lambda_2, 0.0f, 1.0f)) {
+				return 0;
+			}
+		}
+	}
+
+	return -1;
+}
+
+/* -------------------------------------------------------------------- */
+/** \name 2D Arrow Manipulator API
+ *
+ * \{ */
+
+static void MANIPULATOR_WT_arrow_2d(wmManipulatorType *wt)
+{
+	/* identifiers */
+	wt->idname = "MANIPULATOR_WT_arrow_2d";
+
+	/* api callbacks */
+	wt->draw = manipulator_arrow2d_draw;
+	wt->setup = manipulator_arrow2d_setup;
+	wt->invoke = manipulator_arrow2d_invoke;
+	wt->test_select = manipulator_arrow2d_test_select;
+
+	wt->struct_size = sizeof(wmManipulator);
+
+	/* rna */
+	RNA_def_float(wt->srna, "length", 1.0f, 0.0f, FLT_MAX, "Arrow Line Length", "", 0.0f, FLT_MAX);
+	RNA_def_float_rotation(
+	        wt->srna, "angle", 0, NULL, DEG2RADF(-360.0f), DEG2RADF(360.0f),
+	        "Roll", "", DEG2RADF(-360.0f), DEG2RADF(360.0f));
+}
+
+void ED_manipulatortypes_arrow_2d(void)
+{
+	WM_manipulatortype_append(MANIPULATOR_WT_arrow_2d);
+}
+
+/** \} */