transform_input.c

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/*
 * $Id: transform_input.c 36790 2011-05-20 07:40:05Z campbellbarton $
 *
 * ***** 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.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <stdlib.h>
#include <math.h>

#include "DNA_screen_types.h"

#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "WM_types.h"

#include "transform.h"

#include "MEM_guardedalloc.h" 

/* ************************** INPUT FROM MOUSE *************************** */

static void InputVector(TransInfo *t, MouseInput *mi, const int mval[2], float output[3])
{
        float vec[3], dvec[3];
        if(mi->precision)
        {
                /* calculate the main translation and the precise one separate */
                convertViewVec(t, dvec, (mval[0] - mi->precision_mval[0]), (mval[1] - mi->precision_mval[1]));
                mul_v3_fl(dvec, 0.1f);
                convertViewVec(t, vec, (mi->precision_mval[0] - t->imval[0]), (mi->precision_mval[1] - t->imval[1]));
                add_v3_v3v3(output, vec, dvec);
        }
        else
        {
                convertViewVec(t, output, (mval[0] - t->imval[0]), (mval[1] - t->imval[1]));
        }

}

static void InputSpring(TransInfo *UNUSED(t), MouseInput *mi, const int mval[2], float output[3])
{
        float ratio, precise_ratio, dx, dy;
        if(mi->precision)
        {
                /* calculate ratio for shiftkey pos, and for total, and blend these for precision */
                dx = (float)(mi->center[0] - mi->precision_mval[0]);
                dy = (float)(mi->center[1] - mi->precision_mval[1]);
                ratio = (float)sqrt( dx*dx + dy*dy);

                dx= (float)(mi->center[0] - mval[0]);
                dy= (float)(mi->center[1] - mval[1]);
                precise_ratio = (float)sqrt( dx*dx + dy*dy);

                ratio = (ratio + (precise_ratio - ratio) / 10.0f) / mi->factor;
        }
        else
        {
                dx = (float)(mi->center[0] - mval[0]);
                dy = (float)(mi->center[1] - mval[1]);
                ratio = (float)sqrt( dx*dx + dy*dy) / mi->factor;
        }

        output[0] = ratio;
}

static void InputSpringFlip(TransInfo *t, MouseInput *mi, const int mval[2], float output[3])
{
        InputSpring(t, mi, mval, output);

        /* flip scale */
        /* values can become really big when zoomed in so use longs [#26598] */
        if      ((long long int)(mi->center[0] - mval[0]) * (long long int)(mi->center[0] - mi->imval[0]) +
                 (long long int)(mi->center[1] - mval[1]) * (long long int)(mi->center[1] - mi->imval[1]) < 0)
         {
                output[0] *= -1.0f;
         }
}

static void InputTrackBall(TransInfo *UNUSED(t), MouseInput *mi, const int mval[2], float output[3])
{

        if(mi->precision)
        {
                output[0] = ( mi->imval[1] - mi->precision_mval[1] ) + ( mi->precision_mval[1] - mval[1] ) * 0.1f;
                output[1] = ( mi->precision_mval[0] - mi->imval[0] ) + ( mval[0] - mi->precision_mval[0] ) * 0.1f;
        }
        else
        {
                output[0] = (float)( mi->imval[1] - mval[1] );
                output[1] = (float)( mval[0] - mi->imval[0] );
        }

        output[0] *= mi->factor;
        output[1] *= mi->factor;
}

static void InputHorizontalRatio(TransInfo *t, MouseInput *mi, const int mval[2], float output[3]) {
        float x, pad;

        pad = t->ar->winx / 10;

        if (mi->precision)
        {
                /* deal with Shift key by adding motion / 10 to motion before shift press */
                x = mi->precision_mval[0] + (float)(mval[0] - mi->precision_mval[0]) / 10.0f;
        }
        else {
                x = mval[0];
        }

        output[0] = (x - pad) / (t->ar->winx - 2 * pad);
}

static void InputHorizontalAbsolute(TransInfo *t, MouseInput *mi, const int mval[2], float output[3]) {
        float vec[3];

        InputVector(t, mi, mval, vec);
        project_v3_v3v3(vec, vec, t->viewinv[0]);

        output[0] = dot_v3v3(t->viewinv[0], vec) * 2.0f;
}

static void InputVerticalRatio(TransInfo *t, MouseInput *mi, const int mval[2], float output[3]) {
        float y, pad;

        pad = t->ar->winy / 10;

        if (mi->precision) {
                /* deal with Shift key by adding motion / 10 to motion before shift press */
                y = mi->precision_mval[1] + (float)(mval[1] - mi->precision_mval[1]) / 10.0f;
        }
        else {
                y = mval[0];
        }

        output[0] = (y - pad) / (t->ar->winy - 2 * pad);
}

static void InputVerticalAbsolute(TransInfo *t, MouseInput *mi, const int mval[2], float output[3]) {
        float vec[3];

        InputVector(t, mi, mval, vec);
        project_v3_v3v3(vec, vec, t->viewinv[1]);

        output[0] = dot_v3v3(t->viewinv[1], vec) * 2.0f;
}

void setCustomPoints(TransInfo *UNUSED(t), MouseInput *mi, int start[2], int end[2])
{
        int *data;

        if (mi->data == NULL) {
                mi->data = MEM_callocN(sizeof(int) * 4, "custom points");
        }
        
        data = mi->data;

        data[0] = start[0];
        data[1] = start[1];
        data[2] = end[0];
        data[3] = end[1];
}

static void InputCustomRatio(TransInfo *UNUSED(t), MouseInput *mi, const int mval[2], float output[3])
{
        float length;
        float distance;
        int *data = mi->data;
        int dx, dy;
        
        if (data) {
                dx = data[2] - data[0];
                dy = data[3] - data[1];
                
                length = (float)sqrtf(dx*dx + dy*dy);
                
                if (mi->precision) {
                        /* deal with Shift key by adding motion / 10 to motion before shift press */
                        int mdx, mdy;
                        mdx = (mi->precision_mval[0] + (float)(mval[0] - mi->precision_mval[0]) / 10.0f) - data[2];
                        mdy = (mi->precision_mval[1] + (float)(mval[1] - mi->precision_mval[1]) / 10.0f) - data[3];

                        distance = (length != 0.0f)? (mdx*dx + mdy*dy) / length: 0.0f;
                }
                else {
                        int mdx, mdy;
                        mdx = mval[0] - data[2];
                        mdy = mval[1] - data[3];

                        distance = (length != 0.0f)? (mdx*dx + mdy*dy) / length: 0.0f;
                }

                output[0] = (length != 0.0f)? distance / length: 0.0f;
        }
}

static void InputAngle(TransInfo *UNUSED(t), MouseInput *mi, const int mval[2], float output[3])
{
        double dx2 = mval[0] - mi->center[0];
        double dy2 = mval[1] - mi->center[1];
        double B = sqrt(dx2*dx2+dy2*dy2);

        double dx1 = mi->imval[0] - mi->center[0];
        double dy1 = mi->imval[1] - mi->center[1];
        double A = sqrt(dx1*dx1+dy1*dy1);

        double dx3 = mval[0] - mi->imval[0];
        double dy3 = mval[1] - mi->imval[1];

        double *angle = mi->data;

        /* use doubles here, to make sure a "1.0" (no rotation) doesnt become 9.999999e-01, which gives 0.02 for acos */
        double deler = ((dx1*dx1+dy1*dy1)+(dx2*dx2+dy2*dy2)-(dx3*dx3+dy3*dy3))
                / (2.0 * ((A*B)?(A*B):1.0));
        /* ((A*B)?(A*B):1.0) this takes care of potential divide by zero errors */

        float dphi;

        dphi = saacos((float)deler);
        if( (dx1*dy2-dx2*dy1)>0.0 ) dphi= -dphi;

        /* If the angle is zero, because of lack of precision close to the 1.0 value in acos
         * approximate the angle with the opposite side of the normalized triangle
         * This is a good approximation here since the smallest acos value seems to be around
         * 0.02 degree and lower values don't even have a 0.01% error compared to the approximation
         * */
        if (dphi == 0)
        {
                double dx, dy;

                dx2 /= A;
                dy2 /= A;

                dx1 /= B;
                dy1 /= B;

                dx = dx1 - dx2;
                dy = dy1 - dy2;

                dphi = sqrt(dx*dx + dy*dy);
                if( (dx1*dy2-dx2*dy1)>0.0 ) dphi= -dphi;
        }

        if(mi->precision) dphi = dphi/30.0f;

        /* if no delta angle, don't update initial position */
        if (dphi != 0)
        {
                mi->imval[0] = mval[0];
                mi->imval[1] = mval[1];
        }

        *angle += (double)dphi;

        output[0] = *angle;
}

void initMouseInput(TransInfo *UNUSED(t), MouseInput *mi, int center[2], int mval[2])
{
        mi->factor = 0;
        mi->precision = 0;

        mi->center[0] = center[0];
        mi->center[1] = center[1];

        mi->imval[0] = mval[0];
        mi->imval[1] = mval[1];

        mi->post = NULL;
}

static void calcSpringFactor(MouseInput *mi)
{
        mi->factor = (float)sqrt(
                (
                        ((float)(mi->center[1] - mi->imval[1]))*((float)(mi->center[1] - mi->imval[1]))
                +
                        ((float)(mi->center[0] - mi->imval[0]))*((float)(mi->center[0] - mi->imval[0]))
                ) );

        if (mi->factor==0.0f)
                mi->factor= 1.0f; /* prevent Inf */
}

void initMouseInputMode(TransInfo *t, MouseInput *mi, MouseInputMode mode)
{

        switch(mode)
        {
        case INPUT_VECTOR:
                mi->apply = InputVector;
                t->helpline = HLP_NONE;
                break;
        case INPUT_SPRING:
                calcSpringFactor(mi);
                mi->apply = InputSpring;
                t->helpline = HLP_SPRING;
                break;
        case INPUT_SPRING_FLIP:
                calcSpringFactor(mi);
                mi->apply = InputSpringFlip;
                t->helpline = HLP_SPRING;
                break;
        case INPUT_ANGLE:
                mi->data = MEM_callocN(sizeof(double), "angle accumulator");
                mi->apply = InputAngle;
                t->helpline = HLP_ANGLE;
                break;
        case INPUT_TRACKBALL:
                /* factor has to become setting or so */
                mi->factor = 0.01f;
                mi->apply = InputTrackBall;
                t->helpline = HLP_TRACKBALL;
                break;
        case INPUT_HORIZONTAL_RATIO:
                mi->factor = (float)(mi->center[0] - mi->imval[0]);
                mi->apply = InputHorizontalRatio;
                t->helpline = HLP_HARROW;
                break;
        case INPUT_HORIZONTAL_ABSOLUTE:
                mi->apply = InputHorizontalAbsolute;
                t->helpline = HLP_HARROW;
                break;
        case INPUT_VERTICAL_RATIO:
                mi->apply = InputVerticalRatio;
                t->helpline = HLP_VARROW;
                break;
        case INPUT_VERTICAL_ABSOLUTE:
                mi->apply = InputVerticalAbsolute;
                t->helpline = HLP_VARROW;
                break;
        case INPUT_CUSTOM_RATIO:
                mi->apply = InputCustomRatio;
                t->helpline = HLP_NONE;
                break;
        case INPUT_NONE:
        default:
                mi->apply = NULL;
                break;
        }

        /* bootstrap mouse input with initial values */
        applyMouseInput(t, mi, mi->imval, t->values);
}

void setInputPostFct(MouseInput *mi, void       (*post)(struct TransInfo *, float [3]))
{
        mi->post = post;
}

void applyMouseInput(TransInfo *t, MouseInput *mi, const int mval[2], float output[3])
{
        if (mi->apply != NULL)
        {
                mi->apply(t, mi, mval, output);
        }

        if (mi->post)
        {
                mi->post(t, output);
        }
}

int handleMouseInput(TransInfo *t, MouseInput *mi, wmEvent *event)
{
        int redraw = TREDRAW_NOTHING;

        switch (event->type)
        {
        case LEFTSHIFTKEY:
        case RIGHTSHIFTKEY:
                if (event->val==KM_PRESS)
                {
                        t->modifiers |= MOD_PRECISION;
                        /* shift is modifier for higher precision transform
                         * store the mouse position where the normal movement ended */
                        VECCOPY2D(mi->precision_mval, event->mval);
                        mi->precision = 1;
                }
                else
                {
                        t->modifiers &= ~MOD_PRECISION;
                        mi->precision = 0;
                }
                redraw = TREDRAW_HARD;
                break;
        }

        return redraw;
}