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Add shear transformation and transform object (issue #152).

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Add origin parameters to love.graphics.print.

New shear parameters kx,ky for:
- love.graphics.draw,
- love.graphics.drawq,
- love.graphics.print,
- SpriteBatch:add,
- SpriteBatch:addq.

Transform objects apply to:
- love.graphics.draw,
- love.graphics.drawq,
- love.graphics.print.
This commit is contained in:
vrld
2011-07-05 14:33:34 +02:00
parent ce5927379d
commit d420d68048
20 changed files with 214 additions and 55 deletions
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src/common/Matrix.cpp
+26 -12
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@@ -116,23 +116,30 @@ namespace love
e[5] = sy;
}
void Matrix::setTransformation(float x, float y, float angle, float sx, float sy, float ox, float oy)
void Matrix::setShear(float kx, float ky)
{
setIdentity();
e[1] = ky;
e[4] = kx;
}
void Matrix::setTransformation(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky)
{
memset(e, 0, sizeof(float)*16); // zero out matrix
float c = cos(angle), s = sin(angle);
// matrix multiplication carried out on paper:
// |1 x| |c -s | |sx | |1 -ox|
// | 1 y| |s c | | sy | | 1 -oy|
// | 1 | | 1 | | 1 | | 1 |
// | 1| | 1| | 1| | 1 |
// move rotate scale origin
// |1 x| |c -s | |sx | | 1 ky | |1 -ox|
// | 1 y| |s c | | sy | |kx 1 | | 1 -oy|
// | 1 | | 1 | | 1 | | 1 | | 1 |
// | 1| | 1| | 1| | 1| | 1 |
// move rotate scale skew origin
e[10] = e[15] = 1.0f;
e[0] = sx * c;
e[1] = sx * s;
e[4] = -sy * s;
e[5] = sy * c;
e[12] = -ox * e[0] - oy * e[4] + x;
e[13] = -ox * e[1] - oy * e[5] + y;
e[0] = c * sx - ky * s * sy; // = a
e[1] = s * sx + ky * c * sy; // = b
e[4] = kx * c * sx - s * sy; // = c
e[5] = kx * s * sx + c * sy; // = d
e[12] = x - ox * e[0] - oy * e[4];
e[13] = y - ox * e[1] - oy * e[5];
}
void Matrix::translate(float x, float y)
@@ -156,6 +163,13 @@ namespace love
this->operator *=(t);
}
void Matrix::shear(float kx, float ky)
{
Matrix t;
t.setShear(kx,ky);
this->operator *=(t);
}
// | x |
// | y |
// | 0 |