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Spray tool now works with small widths and speeds. (fix #838)

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This commit is contained in:
Aravin 2015-10-27 19:18:59 -04:00
parent 41f4fcf802
commit 5c451d2cfd
1 changed files with 25 additions and 18 deletions
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43
src/app/tools/point_shapes.h
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@ -131,6 +131,7 @@ private:
class SprayPointShape : public PointShape { class SprayPointShape : public PointShape {
BrushPointShape m_subPointShape; BrushPointShape m_subPointShape;
float m_pointRemainder = 0;
public: public:
@ -143,31 +144,37 @@ public:
void transformPoint(ToolLoop* loop, int x, int y) override { void transformPoint(ToolLoop* loop, int x, int y) override {
int spray_width = loop->getSprayWidth(); int spray_width = loop->getSprayWidth();
int spray_speed = loop->getSpraySpeed(); int spray_speed = loop->getSpraySpeed();
int c, u, v, times = (spray_width*spray_width/4) * spray_speed / 100;
// In Windows, rand() has a RAND_MAX too small // The number of points to spray is proportional to the spraying area, and
// we calculate it as a float to handle very low spray rates properly.
float points_to_spray = (spray_width * spray_width / 4.0f) * spray_speed / 100.0f;
// We add the fractional points from last time to get
// the total number of points to paint this time.
points_to_spray += m_pointRemainder;
int integral_points = (int)points_to_spray;
// Save any leftover fraction of a point for next time.
m_pointRemainder = points_to_spray - integral_points;
ASSERT(m_pointRemainder >= 0 && m_pointRemainder < 1.0f);
fixmath::fixed angle, radius;
for (int c=0; c<integral_points; c++) {
#if RAND_MAX <= 0xffff #if RAND_MAX <= 0xffff
fixmath::fixed angle, radius; // In Windows, rand() has a RAND_MAX too small
angle = fixmath::itofix(rand() * 255 / RAND_MAX);
for (c=0; c<times; c++) { radius = fixmath::itofix(rand() * spray_width / RAND_MAX);
angle = fixmath::itofix(rand() * 256 / RAND_MAX);
radius = fixmath::itofix(rand() * (spray_width*10) / RAND_MAX) / 10;
u = fixmath::fixtoi(fixmath::fixmul(radius, fixmath::fixcos(angle)));
v = fixmath::fixtoi(fixmath::fixmul(radius, fixmath::fixsin(angle)));
m_subPointShape.transformPoint(loop, x+u, y+v);
}
#else #else
fixmath::fixed angle, radius;
for (c=0; c<times; c++) {
angle = rand(); angle = rand();
radius = rand() % fixmath::itofix(spray_width); radius = rand() % fixmath::itofix(spray_width);
u = fixmath::fixtoi(fixmath::fixmul(radius, fixmath::fixcos(angle))); #endif
v = fixmath::fixtoi(fixmath::fixmul(radius, fixmath::fixsin(angle)));
int u = fixmath::fixtoi(fixmath::fixmul(radius, fixmath::fixcos(angle)));
int v = fixmath::fixtoi(fixmath::fixmul(radius, fixmath::fixsin(angle)));
m_subPointShape.transformPoint(loop, x+u, y+v); m_subPointShape.transformPoint(loop, x+u, y+v);
} }
#endif
} }
void getModifiedArea(ToolLoop* loop, int x, int y, Rect& area) override { void getModifiedArea(ToolLoop* loop, int x, int y, Rect& area) override {