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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 NaN Holding BV. All rights reserved. */
/** \file
* \ingroup edtransform
*/
#include "BLI_math.h"
#include "GPU_immediate.h"
#include "GPU_matrix.h"
#include "GPU_state.h"
#include "BKE_context.h"
#include "DNA_screen_types.h"
#include "DNA_userdef_types.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "transform.h"
#include "transform_draw_cursors.h" /* Own include. */
enum eArrowDirection {
UP,
DOWN,
LEFT,
RIGHT,
};
#define ARROW_WIDTH (2.0f * U.pixelsize)
#define DASH_WIDTH (1.0f)
#define DASH_LENGTH (8.0f * DASH_WIDTH * U.pixelsize)
static void drawArrow(const uint pos_id, const enum eArrowDirection dir)
{
int offset = 5.0f * UI_DPI_FAC;
int length = (6.0f * UI_DPI_FAC) + (4.0f * U.pixelsize);
int size = (3.0f * UI_DPI_FAC) + (2.0f * U.pixelsize);
/* To line up the arrow point nicely, one end has to be extended by half its width. But
* being on a 45 degree angle, Pythagoras says a movement of sqrt(2)/2 * (line width /2) */
float adjust = (M_SQRT2 * ARROW_WIDTH / 4.0f);
if (ELEM(dir, LEFT, DOWN)) {
offset = -offset;
length = -length;
size = -size;
adjust = -adjust;
}
immBegin(GPU_PRIM_LINES, 6);
if (ELEM(dir, LEFT, RIGHT)) {
immVertex2f(pos_id, offset, 0);
immVertex2f(pos_id, offset + length, 0);
immVertex2f(pos_id, offset + length + adjust, adjust);
immVertex2f(pos_id, offset + length - size, -size);
immVertex2f(pos_id, offset + length, 0);
immVertex2f(pos_id, offset + length - size, size);
}
else {
immVertex2f(pos_id, 0, offset);
immVertex2f(pos_id, 0, offset + length);
immVertex2f(pos_id, adjust, offset + length + adjust);
immVertex2f(pos_id, -size, offset + length - size);
immVertex2f(pos_id, 0, offset + length);
immVertex2f(pos_id, size, offset + length - size);
}
immEnd();
}
bool transform_draw_cursor_poll(bContext *C)
{
ARegion *region = CTX_wm_region(C);
return (region && ELEM(region->regiontype, RGN_TYPE_WINDOW, RGN_TYPE_PREVIEW)) ? 1 : 0;
}
void transform_draw_cursor_draw(bContext *UNUSED(C), int x, int y, void *customdata)
{
TransInfo *t = (TransInfo *)customdata;
if (t->helpline == HLP_NONE) {
return;
}
float cent[2];
const float mval[3] = {x, y, 0.0f};
float tmval[2] = {
(float)t->mval[0],
(float)t->mval[1],
};
projectFloatViewEx(t, t->center_global, cent, V3D_PROJ_TEST_CLIP_ZERO);
/* Offset the values for the area region. */
const float offset[2] = {
t->region->winrct.xmin,
t->region->winrct.ymin,
};
for (int i = 0; i < 2; i++) {
cent[i] += offset[i];
tmval[i] += offset[i];
}
float viewport_size[4];
GPU_viewport_size_get_f(viewport_size);
GPU_line_smooth(true);
GPU_blend(GPU_BLEND_ALPHA);
const uint pos_id = GPU_vertformat_attr_add(
immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
/* Dashed lines first. */
if (ELEM(t->helpline, HLP_SPRING, HLP_ANGLE)) {
GPU_line_width(DASH_WIDTH);
immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
immUniform2f("viewport_size", viewport_size[2], viewport_size[3]);
immUniform1i("colors_len", 0); /* "simple" mode */
immUniformThemeColor3(TH_VIEW_OVERLAY);
immUniform1f("dash_width", DASH_LENGTH);
immUniform1f("dash_factor", 0.5f);
immBegin(GPU_PRIM_LINES, 2);
immVertex2fv(pos_id, cent);
immVertex2f(pos_id, tmval[0], tmval[1]);
immEnd();
immUnbindProgram();
}
/* And now, solid lines. */
immBindBuiltinProgram(GPU_SHADER_3D_POLYLINE_UNIFORM_COLOR);
immUniformThemeColor3(TH_VIEW_OVERLAY);
immUniform2fv("viewportSize", &viewport_size[2]);
immUniform1f("lineWidth", ARROW_WIDTH);
GPU_matrix_push();
GPU_matrix_translate_3fv(mval);
switch (t->helpline) {
case HLP_SPRING:
GPU_matrix_rotate_axis(-RAD2DEGF(atan2f(cent[0] - tmval[0], cent[1] - tmval[1])), 'Z');
drawArrow(pos_id, UP);
drawArrow(pos_id, DOWN);
break;
case HLP_HARROW:
drawArrow(pos_id, RIGHT);
drawArrow(pos_id, LEFT);
break;
case HLP_VARROW:
drawArrow(pos_id, UP);
drawArrow(pos_id, DOWN);
break;
case HLP_CARROW: {
/* Draw arrow based on direction defined by custom-points. */
const int *data = t->mouse.data;
const float angle = -atan2f(data[2] - data[0], data[3] - data[1]);
GPU_matrix_rotate_axis(RAD2DEGF(angle), 'Z');
drawArrow(pos_id, UP);
drawArrow(pos_id, DOWN);
break;
}
case HLP_ANGLE: {
GPU_matrix_push();
float angle = atan2f(tmval[1] - cent[1], tmval[0] - cent[0]);
GPU_matrix_translate_3f(cosf(angle), sinf(angle), 0);
GPU_matrix_rotate_axis(RAD2DEGF(angle), 'Z');
drawArrow(pos_id, DOWN);
GPU_matrix_pop();
GPU_matrix_translate_3f(cosf(angle), sinf(angle), 0);
GPU_matrix_rotate_axis(RAD2DEGF(angle), 'Z');
drawArrow(pos_id, UP);
break;
}
case HLP_TRACKBALL: {
uchar col[3], col2[3];
UI_GetThemeColor3ubv(TH_GRID, col);
UI_make_axis_color(col, col2, 'X');
immUniformColor3ubv(col2);
drawArrow(pos_id, RIGHT);
drawArrow(pos_id, LEFT);
UI_make_axis_color(col, col2, 'Y');
immUniformColor3ubv(col2);
drawArrow(pos_id, UP);
drawArrow(pos_id, DOWN);
break;
}
case HLP_NONE:
break;
}
GPU_matrix_pop();
immUnbindProgram();
GPU_line_smooth(false);
GPU_blend(GPU_BLEND_NONE);
}
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