RadialGradientpublic class RadialGradient extends Gradient
| Fields Summary |
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| float | cx | | float | cy | | float | rsq | | float | fx | | float | fy |
| Constructors Summary |
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public RadialGradient(int cx, int cy, int fx, int fy, int radius, Transform6 gradientTransform, GradientColorMap colorMap)
super(gradientTransform, colorMap);
this.cx = cx/65536.0f;
this.cy = cy/65536.0f;
float r = radius/65536.0f;
this.rsq = r*r;
this.fx = fx/65536.0f;
this.fy = fy/65536.0f;
float fcx = this.fx - this.cx;
float fcy = this.fy - this.cy;
float d = (float)Math.sqrt(fcx*fcx + fcy*fcy);
if (d > r*0.97f) {
float f = (r*0.97f)/d;
this.fx = this.cx + f*fcx;
this.fy = this.cy + f*fcy;
}
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| Methods Summary |
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| public void | paint(int x, int y, int width, int height, int[] minTouched, int[] maxTouched, int[] dst, int dstOffset, int dstScanlineStride)
float a00 = inverse.m00/65536.0f;
float a01 = inverse.m01/65536.0f;
float a02 = inverse.m02/65536.0f;
float a10 = inverse.m10/65536.0f;
float a11 = inverse.m11/65536.0f;
float a12 = inverse.m12/65536.0f;
int sx = x;
for (int j = 0; j < height; j++, y++) {
int minX = minTouched[j];
int maxX = maxTouched[j];
int w = (maxX >= minX) ? (maxX - minX + 1) : 0;
if (w + minX > width) {
w = width - minX;
}
int didx = dstOffset + minX;
x = sx + minX;
double txx = x*a00 + y*a01 + a02;
double tyy = x*a10 + y*a11 + a12;
double fxx = fx - txx;
double fyy = fy - tyy;
double A = fxx*fxx + fyy*fyy;
double cfx = cx - fx;
double cfy = cy - fy;
double B = 2.0f*(cfx*fxx + cfy*fyy);
double C = cfx*cfx + cfy*cfy - rsq;
double Csq = C*C;
double U = -B/(2.0f*C);
double dU = (a00*cfx + a10*cfy)/C;
double V = (B*B - 4.0f*A*C)/(4.0f*Csq);
double dV = (2.0f*a00*a10*cfx*cfy +
a00*(a00*(cfx*cfx - C) - B*cfx + 2.0f*C*fxx) +
a10*(a10*(cfy*cfy - C) - B*cfy + 2.0f*C*fyy))/Csq;
double tmp = a10*cfx - a00*cfy;
double ddV = 2.0f*((a00*a00 + a10*a10)*rsq - tmp*tmp)/Csq;
for (int i = 0; i < w; i++, didx++, x++) {
double g = U + Math.sqrt(V);
U += dU;
V += dV;
dV += ddV;
dst[didx] = colorMap.getColor((int)(g*65536.0));
}
dstOffset += dstScanlineStride;
}
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