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Shape tool calculations: use floats more

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This commit is contained in:
Bill Kendrick 2023-04-09 22:27:04 -07:00
parent 649cde39ed
commit 58bb30bafc
2 changed files with 45 additions and 41 deletions
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4
docs/CHANGES.txt
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@ -6,11 +6,13 @@ Copyright (c) 2002-2023
Various contributors (see below, and AUTHORS.txt)
https://tuxpaint.org/
2023.April.8 (0.9.30)
2023.April.9 (0.9.30)
* Improvements to Shape tool:
---------------------------
* Octagon allows aspect ratio change
* Slight improvement to shape calculations
* Localization Updates:
---------------------
* Chinese (Simplified) translation

82
src/tuxpaint.c
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@ -22,7 +22,7 @@
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
(See COPYING.txt)
June 14, 2002 - March 21, 2023
June 14, 2002 - April 9, 2023
*/
#include "platform.h"
@ -16066,7 +16066,8 @@ static void free_surface_array(SDL_Surface * surface_array[], int count)
/* Draw a shape! */
static void do_shape(int sx, int sy, int nx, int ny, int rotn, int use_brush)
{
int side, rx, ry, rmax, x1, y1, x2, y2, xp, yp, xv, yv, old_brush, step;
int side, rx, ry, rmax, old_brush, step;
float x1, y1, x2, y2, xp, yp, xv, yv;
float a1, a2, rotn_rad, init_ang, angle_skip;
int xx, yy, offx, offy, max_x, max_y;
@ -16144,19 +16145,19 @@ static void do_shape(int sx, int sy, int nx, int ny, int rotn, int use_brush)
{
a1 = (angle_skip * side + init_ang) * M_PI / 180.0;
a2 = (angle_skip * (side + 1) + init_ang) * M_PI / 180.0;
x1 = (int) (cos(a1) * rx);
y1 = (int) (-sin(a1) * ry);
x1 = (cos(a1) * (float) rx);
y1 = (-sin(a1) * (float) ry);
if (abs(x1) > max_x)
max_x = abs(x1);
if (abs(y1) > max_y)
max_y = abs(y1);
if (fabsf(x1) > max_x)
max_x = fabsf(x1);
if (fabsf(y1) > max_y)
max_y = fabsf(y1);
}
if (max_x < rx)
rx = (rx * rx) / max_x;
rx = (rx * rx) / (int) max_x;
if (max_y < ry)
ry = (ry * ry) / max_y;
ry = (ry * ry) / (int) max_y;
}
@ -16204,23 +16205,30 @@ static void do_shape(int sx, int sy, int nx, int ny, int rotn, int use_brush)
for (side = 0; side < shape_sides[cur_shape]; side = side + step)
{
a1 = (angle_skip * side + init_ang) * M_PI / 180;
a2 = (angle_skip * (side + 1) + init_ang) * M_PI / 180;
a1 = (angle_skip * (float) side + init_ang) * M_PI / 180.0;
x1 = (int) (cos(a1) * rx);
y1 = (int) (-sin(a1) * ry);
x1 = (cos(a1) * (float) rx);
y1 = (-sin(a1) * (float) ry);
x2 = (int) (cos(a2) * rx);
y2 = (int) (-sin(a2) * ry);
if (side < shape_sides[cur_shape] - step) {
a2 = (angle_skip * ((float) side + 1.0) + init_ang) * M_PI / 180.0;
} else {
a2 = init_ang * M_PI / 180.0;
}
xv = (int) (cos((a1 + a2) / 2) * rx * shape_valley[cur_shape] / 100);
yv = (int) (-sin((a1 + a2) / 2) * ry * shape_valley[cur_shape] / 100);
x2 = (cos(a2) * (float) rx);
y2 = (-sin(a2) * (float) ry);
printf("side=%d, a1=%f, a2=%f -- (%f,%f) -> (%f,%f)\n", side, a1, a2, x1, y1, x2, y2);
xv = (cos((a1 + a2) / 2.0) * (float) rx * (float) shape_valley[cur_shape]) / 100.0;
yv = (-sin((a1 + a2) / 2.0) * (float) ry * (float) shape_valley[cur_shape]) / 100.0;
/* Rotate the line: */
if (rotn != 0)
{
rotn_rad = rotn * M_PI / 180;
rotn_rad = rotn * M_PI / 180.0;
if (shape_mode == SHAPEMODE_CENTER) {
xp = (x1 + offx) * cos(rotn_rad) - (y1 + offy) * sin(rotn_rad);
@ -16286,12 +16294,10 @@ static void do_shape(int sx, int sy, int nx, int ny, int rotn, int use_brush)
}
else
{
/* Brush */
if (shape_valley[cur_shape] == 100)
/* Brush */
brush_draw(x1, y1, x2, y2, 0);
else
/* Stars */
{
brush_draw(x1, y1, xv, yv, 0);
brush_draw(xv, yv, x2, y2, 0);
@ -16310,34 +16316,30 @@ static void do_shape(int sx, int sy, int nx, int ny, int rotn, int use_brush)
for (side = 0; side < shape_sides[cur_shape]; side++)
{
a1 = (angle_skip * side + init_ang) * M_PI / 180;
a2 = (angle_skip * (side + 1) + init_ang) * M_PI / 180;
a1 = (angle_skip * (float) side + init_ang) * M_PI / 180.0;
a2 = (angle_skip * ((float) side + 1.0) + init_ang) * M_PI / 180.0;
if (yy == xx * ry / rx)
{
x1 = (int) (cos(a1) * xx);
y1 = (int) (-sin(a1) * yy);
x1 = (cos(a1) * xx);
y1 = (-sin(a1) * yy);
x2 = (int) (cos(a2) * xx);
y2 = (int) (-sin(a2) * yy);
x2 = (cos(a2) * xx);
y2 = (-sin(a2) * yy);
xv =
(int) (cos((a1 + a2) / 2) * xx * shape_valley[cur_shape] / 100);
yv =
(int) (-sin((a1 + a2) / 2) * yy * shape_valley[cur_shape] / 100);
xv = (cos((a1 + a2) / 2) * xx * shape_valley[cur_shape] / 100);
yv = (-sin((a1 + a2) / 2) * yy * shape_valley[cur_shape] / 100);
}
else
{
x1 = (int) (cos(a1) * yy);
y1 = (int) (-sin(a1) * xx);
x1 = (cos(a1) * yy);
y1 = (-sin(a1) * xx);
x2 = (int) (cos(a2) * yy);
y2 = (int) (-sin(a2) * xx);
x2 = (cos(a2) * yy);
y2 = (-sin(a2) * xx);
xv =
(int) (cos((a1 + a2) / 2) * yy * shape_valley[cur_shape] / 100);
yv =
(int) (-sin((a1 + a2) / 2) * xx * shape_valley[cur_shape] / 100);
xv = (cos((a1 + a2) / 2) * yy * shape_valley[cur_shape] / 100);
yv = (-sin((a1 + a2) / 2) * xx * shape_valley[cur_shape] / 100);
}
/* Rotate the line: */