add the box_rotate_bounds convenience method (91caa85c) · Commits · github_fork / Clip

core/graphics/layout.cc

+33 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		*/
		#include <algorithm>
		#include <iostream>
		#include <math.h>
		#include "layout.h"

		namespace fviz {
		@@ -70,5 +71,37 @@ Point layout_align(
		return layout_align(bbox, target);
		}

		Rectangle box_rotate_bounds(
		const Rectangle& b,
		double angle_deg) {
		auto i = sin(-angle_deg * M_PI / 180);
		auto q = cos(-angle_deg * M_PI / 180);

		auto xrange = std::minmax({
		q * (b.w * 0.5) - i * (b.h * 0.5),
		q * (b.w * 0.5) - i * (b.h * -0.5),
		q * (b.w * -0.5) - i * (b.h * -0.5),
		q * (b.w * -0.5) - i * (b.h * 0.5),
		});

		auto yrange = std::minmax({
		q * (b.h * 0.5) + i * (b.w * 0.5),
		q * (b.h * -0.5) + i * (b.w * 0.5),
		q * (b.h * -0.5) + i * (b.w * -0.5),
		q * (b.h * 0.5) + i * (b.w * -0.5),
		});

		auto rw = xrange.second - xrange.first;
		auto rh = yrange.second - yrange.first;

		Rectangle bbox_rot;
		bbox_rot.x = (b.x + b.w * 0.5) - rw * 0.5;
		bbox_rot.y = (b.y + b.h * 0.5) - rh * 0.5;
		bbox_rot.w = rw;
		bbox_rot.h = rh;

		return bbox_rot;
		}

		} // namespace fviz

+8 −0

Original line number	Diff line number	Diff line
		@@ -58,5 +58,13 @@ Point layout_align(
		VAlign valign);


		/**
		* Return the smallest bounding box that can contain the input box after it
		* was rotated `angle_deg` around it's center point
		*/
		Rectangle box_rotate_bounds(
		const Rectangle& bbox,
		double angle_deg);

		} // namespace fviz

0 → 100644

+57 −0

Original line number	Diff line number	Diff line
		/**
		* This file is part of the "fviz" project
		* Copyright (c) 2018 Paul Asmuth
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/
		#include "graphics/brush.h"
		#include "graphics/color.h"
		#include "graphics/layer.h"
		#include "graphics/layer_svg.h"
		#include "graphics/text.h"
		#include "environment.h"
		#include "utils/fileutil.h"
		#include "unittest.h"

		using namespace fviz;

		void test_box_rotate_bounds() {
		{
		Rectangle ri(0, 0, 1, 3);
		Rectangle ro = box_rotate_bounds(ri, 90);
		EXPECT_FEQ(ro.w, 3);
		EXPECT_FEQ(ro.h, 1);
		EXPECT_FEQ(ro.x, -1);
		EXPECT_FEQ(ro.y, 1);
		}

		{
		Rectangle ri(0, 0, 1, 3);
		Rectangle ro = box_rotate_bounds(ri, 180);
		EXPECT_FEQ(ro.w, 1);
		EXPECT_FEQ(ro.h, 3);
		EXPECT_FEQ(ro.x, 0);
		EXPECT_FEQ(ro.y, 0);
		}

		{
		Rectangle ri(10, 20, 1, 3);
		Rectangle ro = box_rotate_bounds(ri, 90);
		EXPECT_FEQ(ro.w, 3);
		EXPECT_FEQ(ro.h, 1);
		EXPECT_FEQ(ro.x, 9);
		EXPECT_FEQ(ro.y, 21);
		}
		}

		int main(int argc, char** argv) {
		test_box_rotate_bounds();
		}

+4 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,8 @@

		#include "return_code.h"

		const double EPSILON = 0.0001;

		#define EXPECT(X) \
		if (!(X)) { \
		std::cerr << "ERROR: expectation failed: " << #X << " on line " << __LINE__ << std::endl; \
		@@ -29,6 +31,8 @@

		#define EXPECT_EQ(A, B) EXPECT((A) == (B))

		#define EXPECT_FEQ(A, B) EXPECT(std::abs((A) - (B)) < EPSILON)

		#define EXPECT_STREQ(A, B) EXPECT(std::string(A) == std::string(B))

		#define EXPECT_OK(X) \