i2p/haiku-beta6
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Mandelbrot: mouse wheel zooming.

Browse Source 
Fixes #9533.
This commit is contained in:
Adrien Destugues
2014-11-20 15:01:45 +01:00
parent c2a13372aa
commit b0ee8bf20a
2 changed files with 50 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/apps/mandelbrot/tsb.cpp
+49 -21
View File
@@ -26,15 +26,10 @@
/*------------------------------------------------------------*/
TShowBit *tsbb;
static TShowBit *tsbb;
static long niter = 256;
static uchar palette[256];
/*------------------------------------------------------------*/
long niter = 256;
/*------------------------------------------------------------*/
uchar palette[256];
/*------------------------------------------------------------*/
void TShowBit::MouseDown(BPoint where)
{
@@ -54,7 +49,41 @@ void TShowBit::MouseDown(BPoint where)
redraw_mand();
}
/*------------------------------------------------------------*/
void
TShowBit::MessageReceived(BMessage* message)
{
switch(message->what) {
case B_MOUSE_WHEEL_CHANGED:
{
//float factor = 1;
float change = message->FindFloat("be:wheel_delta_y");
BPoint where;
GetMouse(&where, 0, 0);
selection = Bounds();
if (change < 0) {
// zoom in
selection.top = (where.y + selection.top) / 2;
selection.bottom = (where.y + selection.bottom) / 2;
selection.left = (where.x + selection.left) / 2;
selection.right = (where.x + selection.right) / 2;
} else {
// zoom out
selection.top = - where.y + selection.top * 2;
selection.bottom = - where.y + selection.bottom * 2;
selection.left = - where.x + selection.left * 2;
selection.right = - where.x + selection.right * 2;
}
redraw_mand();
break;
}
default:
BView::MessageReceived(message);
}
}
void TShowBit::redraw_mand()
{
@@ -66,13 +95,12 @@ void TShowBit::redraw_mand()
px -= (scale / 2.0);
py -= (scale / 2.0);
scale *= 2.0;
}
else {
} else {
px0 = px + (scale * (selection.left / (1.0*size_x)));
py0 = py + (scale * (selection.top / (1.0*size_x)));
scale0 = scale * ((selection.bottom-selection.top) / (1.0*size_x));
px = px0; py = py0; scale = scale0;
px = px0; py = py0; scale = scale0;
}
selection.Set(-1000, -1000, -1000, -1000);
mand(px, py, scale, scale);
@@ -97,7 +125,7 @@ void TShowBit::set_palette(long code)
{
rgb_color c = {0, 0, 0, 255};
long i;
BScreen screen( Window() );
if (code == 0) {
@@ -192,7 +220,7 @@ int iterate_double(double a, double b)
y = (2.0 * x * y) + b;
i++;
x = a + (xsq - ysq);
if ((xsq + ysq) > 4.0)
return(i);
}
@@ -222,7 +250,7 @@ int iterate_float(float a, float b)
y = (2.0f * x * y) + b;
i++;
x = a + (xsq - ysq);
if ((xsq + ysq) > 4.0f)
return(i);
}
@@ -267,7 +295,7 @@ void TShowBit::mand(double vx, double vy, double sx, double sy)
t1_done = 0; t2_done = 0;
precompute(vx, vy, sx, sy);
resume_thread(spawn_thread(__calc1, "calc1", B_NORMAL_PRIORITY, NULL));
resume_thread(spawn_thread(__calc2, "calc2", B_NORMAL_PRIORITY, NULL));
busy = TRUE;
@@ -293,7 +321,7 @@ void TShowBit::precompute(double vx, double vy, double sx, double sy)
{
long x, y;
double cx, cy;
double scale = sx;
double scale = sx;
sx = sx / (32.0);
sy = sy / (32.0);
@@ -328,7 +356,7 @@ void TShowBit::mandb(double vx, double vy, double sx, double sy)
uchar *b0;
long y12;
long x12;
double scale = sx;
double scale = sx;
sx = sx / (size_x * 1.0);
sy = sy / (size_y * 1.0);
@@ -344,7 +372,7 @@ void TShowBit::mandb(double vx, double vy, double sx, double sy)
for (bx = 0; bx < size_x; bx += 12) {
x12 = (bx+6) / 12;
v = pc[x12][y12];
if (exit_now)
goto done;
@@ -391,8 +419,8 @@ void TShowBit::manda(double vx, double vy, double sx, double sy)
uchar *b0;
long y12;
long x12;
double scale = sx;
double scale = sx;
sx = sx / (size_x * 1.0);
sy = sy / (size_y * 1.0);
cy = vy;
src/apps/mandelbrot/tsb.h
+1
View File
@@ -37,6 +37,7 @@ public:
virtual ~TShowBit();
virtual void Draw(BRect);
virtual void MouseDown(BPoint where);
void MessageReceived(BMessage* message);
virtual void Pulse();
void mand(double vx, double vy, double sx, double sy);
long limit_v(long v);